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Table 4-25  
Population Served by All Public Water Supplies Potentially Contaminated with Agricultural Chemicals, in Idaho, the Region, and the U.S., 1987

  Population Served by Public Water Supplies    
 
   
    Potentially Contaminated Counties    
   
   
  Groundwater
Source[1]
Surface and
Groundwater
Groundwater
Only[2]
Potentially
Contaminated Counties
 
  (%) (1,000s) (1,000s) (N) (%)[3]

Idaho 83 271 225 6 14
Alaska 60 - - - -
Montana 35 85 30 5 9
Nevada 46 0 0 0 0
Oregon 29 53 15 1 3
Utah 51 0 0 0 0
Washington 64 484 310 13 33
Wyoming 38 7 3 1 4
U.S.   81,850 34,492 1,437 -

Source: E. G. Nielsen and L. K. Lee, The Magnitude & Costs of Groundwater Contamination from Agricultural Chemicals: A National Perspective (U.S. Department of Agriculture, Economic Research Service, Natural Resource Economics Division, 1987), Staff Report AGES 8
Note: Data may not add to totals due to rounding.
[1] Calculated as the total state population served by public groundwater supplies divided by the total state population served by all public supplies.
[2] Estimated by multiplying the number of people served by public surface water and groundwater supplies by the percentage of people served by public supplies with a groundwater source.
[3] Calculated as the number of potentially contaminated counties divided by the total number of counties in the state.

Compiled by: Diane Prorak, data input assisted by: Robert Anton-Erik
Contact: Lily Wai

 

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