We found 22 public water systems in Asotin county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Pud #1 Of Asotin County | Clarkston | 19,264 | 48 | 41 |
| Asotin Water Dept | County of Asotin | 2,461 | 0 | 7 |
| Chief Timothy State Park | County of Asotin | 500 | 0 | 0 |
| Fields Spring State Park | County of Asotin | 344 | 0 | 1 |
| Chief Timothy Park | County of Asotin | 160 | 0 | 0 |
| Puffer Butte Group Camp | County of Asotin | 86 | 0 | 0 |
| Jims Express Mart | County of Asotin | 76 | 0 | 0 |
| Chief Timothy State Park, Admin | County of Asotin | 55 | 0 | 0 |
| Head Gates Park | County of Asotin | 45 | 0 | 0 |
| Beamers Landing | County of Asotin | 31 | 0 | 0 |
| Rogersburg Addition | County of Asotin | 28 | 0 | 0 |
| Grande Ronde Ranches #2 | County of Asotin | 25 | 0 | 0 |
| Deans Cafe | County of Asotin | 25 | 0 | 0 |
| Clarkston Water System | County of Asotin | 25 | 0 | 0 |
| Country Living Court | County of Asotin | 23 | 0 | 0 |
| Grand Ronde Ranches #1 | County of Asotin | 20 | 0 | 0 |
| Blue Mountain Homesites | County of Asotin | 12 | 0 | 0 |
| Dalosto Water System | County of Asotin | 4 | 0 | 0 |
| Boggans Oasis | County of Asotin | 3 | 0 | 0 |
| Teds Timberline Cafe | County of Asotin | 3 | 0 | 0 |
| Asotin County Headgates Park | County of Asotin | 2 | 0 | 0 |
| Three Mile Inn | County of Asotin | 2 | 0 | 0 |