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Radon Home Survey in North Dakota - 1988

In the winter and spring of 1988, the North Dakota State Department of Health and Consolidated Laboratories (the Department), in conjunction with the U.S. Environmental Protection Agency (EPA), undertook a Statewide residential radon survey. 1,596 homes were measured with two-day charcoal test canisters. An average concentration of 7.0 picocuries of radon per liter of interior atmosphere (pCi/l) was recorded, with 59% of the homes having concentrations in the 4.0 - 20.0 pCi/l range, and 4% having concentrations of 20.0 pCi/l or greater.

These results indicated a potential for high radon levels throughout the State, with 51 of 53 counties reporting 25% or greater of home screening measurements at or above the EPA action level of 4.0 pCi/l (Tables 2 and 3). Click here for a contour map showing the results of this survey. The sample recovery for the homes survey was 89.6% at the laboratory, but the field recovery is unknown.

These screening measurements were confirmed by analysis of yearlong alpha track detectors placed in 175 of the surveyed homes. 47.4% of these 175 homes had at least one alpha track result above 4.0 pCi/l.

Research Triangle Institute of Research Triangle Park, North Carolina, with the cooperation of the University of North Dakota, was the testing contractor for the Department.

Solicitations to test were made by randomly selecting and calling telephone numbers in each county. The number of calls per county was based upon the county population. An individual could not be selected for a test if they did not have a telephone number. A slight weighting factor was added to counties in extreme western North Dakota, where population densities are very low. Without the factor, some areas would not have been adequately represented geographically.

Figure 1

 

The curve obtained from 1,596 home samples is LOGNORMAL (see Figure 1) at concentrations greater than 1.0 pCi/l. The 7.4 pCi/l Mean is almost double the United States EPA's action level of 4.0 pCi/l. The percentages of sample concentrations greater than 4 pCi/l and 20 pCi/l were 63% and 4.0%, respectively.

TABLE 1 - HOME SURVEY STATISTICS BY PARAMETER

           NUMBER       PERCENT                                 PERCENTAGE OF SAMPLES                   
             OF           OF        ARITHMETIC   STANDARD           GREATER THAN                        
FLOOR      SAMPLES      SAMPLES       MEAN       DEVIATION    4 pCi/l         20 pCi/l 
                                              
  B         1,396         87.5         7.9        9.9            66.8          5.7         

  1           198         12.4         3.7        3.4            32.3                         

  2             2          0.1         3.1        2.6            50.0                         

 All        1,596        100.0         7.4        9.4            62.5          5.0         


The parameter used for the homes survey is by floor. The basements, as expected, dominate the statistics.

The data from the home survey is summarized along with the cluster, day care, school, and WIC home surveys in Figure 8.

The results of the home survey of 1988 indicated high individual radon concentrations and high county averages. The 63% of samples greater than 4 pCi/l was certainly unexpected. Region VIII EPA and the Department entered into additional contracts to assess radon and its problems further.

TABLE 2 - HOME SURVEY STATISTICS BY COUNTY


                   NUMBER                                       PERCENTAGE OF SAMPLES                   
                     OF        ARITHMETIC       STANDARD             GREATER THAN                        
COUNTY             SAMPLES        MEAN          DEVIATION         4 pCi/l      20 pCi/l 

Adams                23            9.3              6.9              78.3         13.0     

Barnes               38            8.0              7.9              73.7          7.9     

Benson                8            7.2              9.8              50.0         12.5     

Billings              9            8.7              5.7              77.8         11.1     

Bottineau            33            6.0              8.6              51.5          3.0     

Bowman               31           10.7             21.8              71.0          6.5     

Burke                 4            2.6              0.8               0.0          0.0     

Burleigh            101            4.9              4.0              46.5          1.0     

Cass                171            7.8              9.2              65.5          5.3     

Cavalier             14            4.9              4.5              42.9          0.0     

Dickey               11            5.5              2.5              81.8          0.0     

Divide                4            8.8              4.6             100.0          0.0     

Dunn                 28            8.7              6.5              75.0         10.7     

Eddy                  4            4.6              4.2              50.0          0.0     

Emmons               15            6.6              5.9              53.3          6.7     

Foster                7            3.7              2.1              42.9          0.0     

Golden Valley         7            4.0              2.0              42.9          0.0     

Grand Forks         172           11.7              9.3              89.5         10.5     

Grant                23            8.1              7.4              60.9          4.3     

Griggs               10            3.3              1.9              20.0          0.0     

Hettinger            31            7.2              5.7              61.3          6.5     

Kidder                8            4.0              2.3              50.0          0.0     

Lamoure               5            5.2              1.5              60.0          0.0     

Logan                13            5.7              3.1              69.2          0.0     

McHenry              30            3.6              2.6              33.3          0.0     

McIntosh              9            7.1             10.5              44.4         11.1     

McKenzie              6            3.5              1.9              50.0          0.0     

McLean               17            5.0              2.2              70.6          0.0     

Mercer               46            8.1              8.0              71.7          6.5     

Morton               99            5.6              4.9              52.5          3.0     

Mountrail            20            7.5              8.3              60.0         10.0     

Nelson               26            5.3              2.9              61.5          0.0     

Oliver               19            6.4              2.8              84.2          0.0     

Pembina              59            9.4              7.8              72.9         13.6     

Pierce               17            3.8              2.2              23.5          0.0     

Ramsey               18            6.6              4.5              77.8          0.0     

Ransom                7            8.4              5.5              57.1          0.0     

Renville              9            5.1              2.3              55.6          0.0     

Richland             46            7.0              7.9              56.5          4.3     

Rolette              20            5.5              4.5              50.0          0.0     

Sargent              10            5.5              2.4              70.0          0.0     

Sheridan              5            5.0              1.2              60.0          0.0     

Sioux                 2            4.9              4.1              50.0          0.0     

Slope                 7            7.0              5.9              42.9          0.0     

Stark               122            8.0             16.9              59.0          4.1     

Steele                7            5.2              5.2              42.9          0.0     

Stutsman             40            7.8             20.4              62.5          2.5     

Towner               10            8.1             10.0              50.0         10.0     

Traill               26            6.8              7.0              65.4          3.8     

Walsh                49           10.5              9.1              75.5         10.2     

Ward                 66            4.2              3.2              45.5          1.5     

Wells                11            5.7              7.4              27.3          9.1     

Williams             23            4.6              2.9              47.8          0.0     



TABLE 3 - HOME SURVEY STATISTICS BY CITY/COUNTY

                                                                        PERCENTAGE OF      
                                  NUMBER                 ARITHMETIC        SAMPLE          
                                    OF      ARITHMETIC   STANDARD       GREATER THAN       
COUNTY        CITY               SAMPLES      MEAN       DEVIATION   4 pCi/l   20 pCi/l     
                      
                                                                     
ADAMS                               23         9.3          6.9        78.3       13.0      
             Bucyrus                 2         6.0          0.4       100.0        0.0      
             Haynes                  1         3.3          0.0         0.0        0.0      
             Hettinger              18         9.2          6.8        77.8       11.1      
             Regent                  1        24.0          0.0       100.0      100.0      

BARNES                              38         8.0          7.9         73.7       7.9      
             Dazey                   1         5.6          0.0        100.0       0.0      
             Fingal                  1         4.3          0.0        100.0       0.0      
             Hannaford               1         7.1          0.0        100.0       0.0      
             Litchville              3         5.8          4.4         33.3       0.0      
             Oriska                  2         2.9          1.2          0.0       0.0      
             Rogers                  1        19.1          0.0        100.0       0.0      
             Sanborn                 1         8.7          0.0        100.0       0.0      
             Tower City              1        10.4          0.0        100.0       0.0      
             Valley City            26         8.4          9.0         76.9      11.5      
             Wimbledon               1         4.4          9.9        100.0       0.0      

BENSON                               8         7.2          9.8         50.0      12.5      
             Esmond                  2        20.3         12.5        100.0      50.0      
             Maddock                 1         1.5          0.0          0.0       0.0      
             Minnewaukan             1         4.4          0.0        100.0       0.0      
             York                    1         3.9          0.0          0.0       0.0      

BILLINGS                             9         8.7          5.7         77.8      11.1      
             Fairfield               5         8.8          7.3         60.0      20.0      

BOTTINEAU                           33         6.0          8.6         51.5       3.0      
             Bottineau              14         5.1          2.5         57.1       0.0      
             Gardena                 2        31.2         21.5        100.0      50.0      
             Lansford                2         4.6          1.1         50.0       0.0      
             Maxbass                 2         4.0          3.5         50.0       0.0      
             Newburg                 3         3.9          1.7         33.3       0.0      
             Overly                  1         1.3          0.0          0.0       0.0      
             Souris                  3         3.8          1.8         66.7       0.0      
             West Hope               2         4.1          2.7         50.0       0.0      
             Westhope                1         1.8          0.0          0.0       0.0      
             Willow City             3         3.6          1.0         33.3       0.0      

BOWMAN                              31        10.7         21.8         71.0       6.5      
             Bowman                 21        11.6         26.0         71.4       4.8      
             Reeder                  1         9.0          0.0        100.0       0.0      
             Scranton                6        10.4          8.8         83.3      16.7      

BURKE                                4         2.6          0.8          0.0       0.0      
             Bowbells                2         3.1          0.4          0.0       0.0      
             Powers Lake             1         2.6          0.0          0.0       0.0      

BURLEIGH                           101         4.9          4.0         46.5       1.0      
             Baldwin                 2         4.2          2.8         50.0       0.0      
             Bismarck               87         4.9          4.2         44.8       1.1      
             Driscoll                1         6.7          0.0        100.0       0.0      
             Lincoln                 2         4.5          1.7         50.0       0.0      
             Menoken                 3         4.9          3.7         66.7       0.0      
             Regan                   1        11.0          0.0        100.0       0.0      
             Sterling                2         2.5          1.7         50.0       0.0      

CASS                               171         7.8          9.2         65.5       5.3      
             Argusville              1         2.5          0.0          0.0       0.0      
             Ayr                     1         3.8          0.0          0.0       0.0      
             Buffalo                 1         4.3          0.0        100.0       0.0      
             Casselton               4        27.4         25.2        100.0      50.0      
             Casselton               1         4.1          0.0        100.0       0.0      
             Fargo                 125         7.5          8.5         66.4       3.2      
             Gardner                 1         4.6          0.0        100.0       0.0      
             Harwood                 2         5.5          1.2        100.0       0.0      
             Hickson                 1        25.1          0.0        100.0     100.0      
             Horace                  5         9.2          5.3         80.0       0.0      
             Hunter                  1         3.8          0.0          0.0       0.0      
             Leonard                 1         4.5          0.0        100.0       0.0      
             Mapleton                2        14.8          7.7        100.0      50.0      
             Riverside               2         3.2          0.3          0.0       0.0      
             West Fargo             20         6.6          5.4         60.0       5.0      
             Wheatland               2         3.2          0.1          0.0       0.0      

CAVALIER                            14         4.9          4.5         42.9       0.0      
             Calio                   1         3.4          0.0          0.0       0.0      
             Langdon                 7         3.1          1.5         28.6       0.0      
             Milton                  3         6.7          5.8         66.7       0.0      
             Osnabrock               1         4.3          0.0        100.0       0.0      
             Sarles                  1         2.6          0.0          0.0       0.0      

DICKEY                              11         5.5          2.5         81.8       0.0      
             Ellendale               2         4.8          0.4        100.0       0.0      
             Forbes                  1         6.2          0.0        100.0       0.0      
             Fullerton               1         4.1          0.0        100.0       0.0      
             Monango                 1        10.1          0.0        100.0       0.0      
             Oakes                   5         5.5          2.9         80.0       0.0      

DIVIDE                               4         8.8          4.6        100.0       0.0      
             Crosby                  2         9.1          4.8        100.0       0.0      
             Noonan                  1         4.2          0.0        100.0       0.0      
             Westby                  1        13.0          0.0        100.0       0.0      

DUNN                                28         8.7          6.5         75.0      10.7      
             Dodge                   2         7.6          1.0        100.0       0.0      
             Dunn Center             4         9.8          6.7         75.0      25.0      
             Gladstone               2        13.4          5.2        100.0       0.0      
             Halliday                3         5.0          1.4         66.7       0.0      
             Killdeer               14         6.1          4.4         64.3       0.0      
             Manning                 1        22.5          0.0        100.0     100.0      

EDDY                                 4         4.6          4.2         50.0       0.0      
             New Rockford            3         2.6          2.6         33.3       0.0      
             Warwick                 1        10.7          0.0        100.0       0.0      

EMMONS                              15         6.6          5.9         53.3       6.7      
             Hague                   1         4.0          0.0          0.0       0.0      
             Hazelton                2         4.5          2.1         50.0       0.0      
             Linton                  9         8.2          7.0         66.7      11.1      
             Strasburg               3         4.1          2.3         33.3       0.0      

FOSTER                               7         3.7          2.1         42.9       0.0      
             Carrington              2         5.0          2.4         50.0       0.0      
             Glenfield               4         2.9          1.8         25.0       0.0      
             Kensel                  1         4.6          0.0        100.0       0.0      

GOLDEN                               7         4.0          2.0         42.9       0.0      
  VALLEY     Beach                   5         4.6          2.1         60.0       0.0      
             Golva                   1         2.7          0.0          0.0       0.0      
             Sentinal Butte          1         2.4          0.0          0.0       0.0      

GRAND                              172        11.7          9.3         89.5      10.5      
  FORKS      Aneta                   2         9.6          0.9        100.0       0.0      
             Emerado                 2         3.1          0.2          0.0       0.0      
             Grand Forks           138        12.3          9.7         92.8      10.9      
             Inkster                 1         4.6          0.0        100.0       0.0      
             Johnstown               1         4.0          0.0          0.0       0.0      
             Larimore                9         9.9          5.7         88.9      11.1      
             Manvel                  1         3.0          0.0          0.0       0.0      
             McCanna                 2         7.9          6.6         50.0       0.0      
             Niagara                 4         3.9          1.6         50.0       0.0      
             Northwood               5        13.2          7.3        100.0      20.0      
             Reynolds                1        14.4          0.0        100.0       0.0      
             Thompson                6        14.0          6.6        100.0      16.7      

GRANT                               23         8.1          7.4         60.9       4.3      
             Carson                  4         7.5          6.3         50.0       0.0      
             Elgin                  12        10.4          8.8         75.0       8.3      
             Glen Ullin              1         7.4          0.0        100.0       0.0      
             Leith                   1         3.7          0.0          0.0       0.0      
             New Leipzig             5         4.1          2.0         40.0       0.0      

GRIGGS                              10         3.3          1.9         20.0       0.0      
             Anetta                  1         3.0          0.0          0.0       0.0      
             Binford                 1         2.9          0.0          0.0       0.0      
             Cooperstown             5         3.8          2.3         20.0       0.0      
             Luverne                 1         4.8          0.0        100.0       0.0      

HETTINGER                           31         7.2          5.7         61.3       6.5      
             Bentley                 2         4.4          1.3         50.0       0.0      
             Mott                   14         5.7          3.7         50.0       0.0      
             New England             9        11.3          7.5         88.9      22.2      

KIDDER                               8         4.0          2.3         50.0       0.0      
             Dawson                  1         3.7          0.0          0.0       0.0      
             Robinson                2         5.0          4.1         50.0       0.0      
             Steele                  4         3.4          1.2         50.0       0.0      
             Tappen                  1         5.1          0.0        100.0       0.0      

LAMOURE                              5         5.2          1.5         60.0       0.0      
             Edgeley                 1         3.2          0.0          0.0       0.0      
             Kulm                    1         6.5          0.0        100.0       0.0      
             Lamoure                 3         5.5          1.4         66.7       0.0      

LOGAN                               13         5.7          3.1         69.2       0.0      
             Gackle                  4         6.1          1.7        100.0       0.0      
             Kintyre                 1         4.8          0.0        100.0       0.0      
             Lehr                    2         3.0          1.1          0.0       0.0      
             Napoleon                5         6.8          4.3         60.0       0.0      

MCHENRY                             30         3.6          2.6         33.3       0.0      
             Anamoose                2         3.9          0.9         50.0       0.0      
             Bantry                  1         2.6          0.0          0.0       0.0      
             Deering                 3         3.4          2.0         33.3       0.0      
             Drake                   4         1.8          0.8          0.0       0.0      
             Granville               4         2.1          1.2         25.0       0.0      
             Karesruhe               1         3.9          0.0          0.0       0.0      
             Karlsruhe               1         1.8          0.0          0.0       0.0      
             Kief                    1         8.6          0.0        100.0       0.0      
             Norwich                 1         5.8          0.0        100.0       0.0      
             Upham                   1         2.5          0.0          0.0       0.0      
             Velva                   6         6.1          3.4         66.7       0.0      
             Voltaire                1         1.8          0.0          0.0       0.0      

MCINTOSH                             9         7.1         10.5         44.4      11.1      
             Ashley                  3        15.2         14.9         66.7      33.3      
             Wishek                  5         2.9          2.2         40.0       0.0      
             Zeelad                 1         3.6          0.0          0.0       0.0      

MCKENZIE                             6         3.5          1.9         50.0       0.0      
             Alexander               2         5.5          0.7        100.0       0.0      
             Watford City            2         3.5          1.8         50.0       0.0      

MCLEAN                              17         5.0          2.2         70.6       0.0      
             Benedict                1         5.7          0.0        100.0       0.0      
             Garrison                5         5.8          2.0         80.0       0.0      
             Max                     2         4.6          2.2         50.0       0.0      
             Turtle Lake             2         3.0          0.4          0.0       0.0      
             Wilton                  3         6.3          3.0        100.0       0.0      

MERCER                              46         8.1          8.0         71.7       6.5      
             Beulah                 18         6.7          5.9         55.6       5.6      
             Golden Valley           2         4.8          0.7        100.0       0.0      
             Hazen                  17         7.7          4.2         82.4       5.9      
             Stanton                 4        11.0          2.1        100.0       0.0      
             Zap                     2        29.1         21.8        100.0      50.0      

MORTON                              99         5.6          4.9         52.5       3.0      
             Almont                  2         8.0          5.4         50.0       0.0      
             Flasher                 2        13.7          5.4        100.0       0.0      
             Fort Rice               1         3.4          0.0          0.0       0.0      
             Hebron                  6         6.6          3.7         66.7       0.0      
             Mandan                 72         4.9          3.6         52.8       1.4      
             New Salem               8         9.1         11.2         25.0      25.0      
             St. Anthony             1         4.4          0.0        100.0       0.0      

MOUNTRAIL                           20         7.5          8.3         60.0      20.0      
             Blaisdell               1         4.6          0.0        100.0       0.0      
             Mountain                1        38.1          0.0        100.0     100.0      
             New Town                2        13.8          8.2        100.0      50.0      
             Palermo                 3         3.6          2.5         33.3       0.0      
             Plaza                   1         3.9          0.0          0.0       0.0      
             Stanley                12         5.4          2.9         58.3       0.0      

NELSON                              26         5.3          2.9         61.5       0.0      
             Brocket                 2         1.8          0.1          0.0       0.0      
             Dahlen                  2         4.4          0.5         50.0       0.0      
             Lakota                  3         5.0          0.8         66.7       0.0      
             McVille                 1         4.0          0.0          0.0       0.0      
             Michigan                9         5.7          3.5         66.7       0.0      
             Niagra                  1         7.1          0.0        100.0       0.0      
             Petersburg              2         9.7          2.4        100.0       0.0      
             Tolna                   1         4.8          0.0        100.0       0.0      

OLIVER                              19         6.4          2.8         84.2       0.0      
             Center                 11         6.8          2.8         90.9       0.0      
             Hannover                1         2.8          0.0          0.0       0.0      
             Hensler                 3         4.9          1.7         66.7       0.0      
             Washburn                1        12.1          0.0        100.0       0.0      

PEMBINA                             59         9.4          7.8         72.9      13.6      
             Bathgate                2         3.7          1.5         50.0       0.0      
             Cavalier               10         7.4          6.0         60.0      10.0      
             Crystal                 5        11.5          8.9         80.0      20.0      
             Drayton                 5         7.5          3.1        100.0       0.0      
             Hamilton                3         8.3          3.4        100.0       0.0      
             Hensel                  2         1.6          0.8          0.0       0.0      
             Mountain                2         5.0          2.5         50.0       0.0      
             Neche                   6       15.5          12.8         66.7      22.2      
             Pembina                 8        15.2          8.0         87.5      27.5      
             St. Thomas              4        10.0          2.3        100.0       0.0      
             Walhalla                8         7.7          5.9         75.0      12.5      
             Walhalla                1         7.1          0.0        100.0       0.0      

PIERCE                              17         3.8          2.2         23.5       0.0      
             Orrin                   2         4.0          1.5         50.0       0.0      
             Rugby                  13         3.0          0.8          7.7       0.0      
             Towner                  1        11.4          0.0        100.0       0.0      

RAMSEY                              18         6.6          4.5         77.8       0.0      
             Churchs Ferry           1         1.6          0.0          0.0       0.0      
             Devils Lake            11         6.5          3.7         90.0       0.0      
             Edmore                  2         6.9          1.3        100.0       0.0      
             Lawton                  1        16.7          0.0        100.0       0.0      
             Starkweather            1        12.8          0.0        100.0       0.0      
             Webster                 1         0.9          0.0          0.0       0.0      

RANSOM                               7         8.4          5.5         57.1       0.0      
             Lisbon                  4        11.1          4.9         75.0       0.0      
             McLeod                  1         2.9          0.0          0.0       0.0      
             Stirum                  1        10.5          0.0        100.0       0.0      

RENVILLE                             9         5.1          2.3         55.6       0.0      
             Glenburn                2         7.7          3.8         50.0       0.0      
             Mohall                  3         4.6          0.8         66.7       0.0      
             Sherwood                2         4.2          0.2         50.0       0.0      

RICHLAND                            46         7.0          7.9         56.5       4.3      
             Barney                  1         5.7          0.0        100.0       0.0      
             Christine               1        48.7          0.0        100.0     100.0      
             Colfax                  1         1.3          0.0          0.0       0.0      
             Fairmount               1         9.8          0.0        100.0       0.0      
             Hankinson               5         3.1          3.1         20.0       0.0      
             Kindred                 1         5.9          0.0        100.0       0.0      
             Lidgerwood              5        10.2          5.7        100.0       0.0      
             Wahpeton               29         6.2          4.8         55.2       3.4      
             Walcott                 1         3.5          0.0          0.0       0.0      
             Wyndmere                1         1.4          0.0          0.0       0.0      

ROLETTE                             20         5.5          4.5         50.0       0.0      
             Belcourt                9         4.5          4.7         33.3       0.0      
             Dunseith                3         6.3          4.3         66.7       0.0      
             Rolette                 1        14.5          0.0        100.0       0.0      
             Rolla                   4         4.1          1.5         50.0       0.0      
             St. John                3         6.3          3.6         66.7       0.0      

SARGENT                             10         5.5          2.4         70.0       0.0      
             Cogswell                1         3.7          0.0          0.0       0.0      
             Forman                  2         4.0          1.7         50.0       0.0      
             Gwinner                 1         6.4          0.0        100.0       0.0      
             Milnor                  3         5.4          2.8         66.7       0.0      

SHERIDAN                             5         5.0          1.2         60.0       0.0      
             Goodrich                2         5.5          0.5        100.0       0.0      
             McClusky                2         5.1          1.5         50.0       0.0      

SIOUX                                2         4.9          4.1         50.0       0.0      
             Selfridge               2         4.9          4.1         50.0       0.0      

SLOPE                                7         7.0          5.9         42.9       0.0      
             Marmarth                1         0.8          0.0          0.0       0.0      
             Rhame                   2        12.7          0.5        100.0       0.0      

STARK                              122         8.0         16.9         59.0       4.1      
             Belfield               11        11.8          8.8         81.8      18.2      
             Dickinson             100         7.7         18.3         55.0       3.0      
             Lefor                   1         2.0          0.0          0.0       0.0      
             Richardton              5         5.8          4.4         60.0       0.0      
             Rutland                 1        16.2          0.0        100.0       0.0      
             South Heart             2         5.2          0.9        100.0       0.0      

STEELE                               7         5.2          5.2         42.9       0.0      
             Finley                  3         3.7          1.1         66.7       0.0      
             Hope                    4         6.4          6.6         25.0       0.0      

STUTSMAN                            40         7.8         20.4         62.5       2.5      
             Buchanan                2         2.2          1.3          0.0       0.0      
             Cleveland               2         2.7          2.2         50.0       0.0      
             Jamestown              30         9.3         23.4         66.7       3.3      
             Kensal                  1         6.4          0.0        100.0       0.0      
             Medina                  2         3.2          1.7         50.0       0.0      
             Woodworth               2         3.4          2.0         50.0       0.0      

TOWNER                              10         8.1         10.0         50.0      10.0      
             Bisby                   1         6.4          0.0        100.0       0.0      
             Calvin                  2        24.4         12.4        100.0      50.0      
             Cando                   4         4.5          1.7         50.0       0.0      
             Egeland                 1         2.7          0.0          0.0       0.0      
             Leeds                   1         2.6          0.0          0.0       0.0      
             Rocklake                1         2.6          0.0          0.0       0.0      

TRAILL                              26         6.8          7.0         65.4       3.8      
             Buxton                  2        22.6         15.7        100.0      50.0      
             Cummings                1         6.3          0.0        100.0       0.0      
             Galesburg               1         7.3          0.0        100.0       0.0      
             Grandin                 1         1.8          0.0          0.0       0.0      
             Hatton                  3         7.7          1.7        100.0       0.0      
             Hillsboro               5         5.8          2.7         60.0       0.0      
             Mayville                8         5.7          4.2         62.5       0.0      
             Portland                4         3.0          1.5         25.0       0.0      

WALSH                               49        10.5          9.1         75.5      10.2      
             Adams                   2         6.8          2.7        100.0       0.0      
             Edinburg                5        22.0         16.8         80.0      60.0      
             Fairdale                1        10.8          0.0        100.0       0.0      
             Fordville               2        10.5          9.5         50.0       0.0      
             Forest River            2        13.6          4.6        100.0       0.0      
             Grafton                10        11.5          7.5         90.0      10.0      
             Hoople                  4        10.0          5.5         75.0       0.0      
             Lankin                  1         6.1          0.0        100.0       0.0      
             Minto                   2         8.3          3.5        100.0       0.0      
             Park River             17         8.4          6.8         64.7       5.9      
             Pisek                   2         4.6          2.4         50.0       0.0      

WARD                                66         4.2          3.2         45.5       1.5      
             Berthold                2         4.4          2.3         50.0       0.0      
             Burlington              4         3.8          1.3         50.0       0.0      
             Carpio                  1         3.7          0.0          0.0       0.0      
             Foxholm                 2         3.6          2.2         50.0       0.0      
             Kenmare                 3         4.5          1.0         66.7       0.0      
             Makoti                  1         4.7          0.0        100.0       0.0      
             Minot                  49         4.2          3.5         44.9       2.0      
             Sawyer                  1         2.3          0.0          0.0       0.0      
             Surrey                  1         2.5          0.0          0.0       0.0      

WELLS                               11         5.7          7.4         27.3       9.1      
             Bowdon                  1         1.1          0.0          0.0       0.0      
             Cathay                  2         3.8          1.8         50.0       0.0      
             Fessenden               3         9.5          9.1         33.3      33.3      
             Harvey                  3         7.0          9.1         33.3       0.0      
             Heaton                  1         3.2          0.0          0.0       0.0      
             Sykston                 1         1.3          0.0          0.0       0.0      

WILLIAMS                            23         4.6          2.9         47.8       0.0      
             Alamo                   1        13.3          0.0        100.0       0.0      
             Epping                  1         4.1          0.0        100.0       0.0      
             Ray                     1         5.4          0.0        100.0       0.0      
             Tioga                   1        10.0          0.0        100.0       0.0      
             Williston              19         3.8          2.1         36.8       0.0      

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