We found 66 public water systems in Adams county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Othello Water Department | Othello | 7,680 | 72 | 24 |
| Ritzville Water Department | County of Adams | 1,725 | 0 | 42 |
| Schrag Eb/wb Rest Areas | County of Adams | 800 | 0 | 16 |
| Adams County Water Dist #1 | County of Adams | 740 | 0 | 18 |
| Lind, Town Of | County of Adams | 618 | 0 | 16 |
| Hgh Inc Water System | County of Adams | 613 | 0 | 27 |
| Hatton Coulee Rest Area | County of Adams | 511 | 0 | 4 |
| Adams County Fair | County of Adams | 503 | 0 | 16 |
| Othello Manor Water System | County of Adams | 400 | 0 | 57 |
| Golden Plains Mhp #1 | County of Adams | 360 | 0 | 119 |
| Washtucna Water Department | County of Adams | 250 | 0 | 43 |
| Summerset West Water Association | County of Adams | 240 | 0 | 9 |
| Saddle Mountain Water Assoc. | County of Adams | 219 | 0 | 16 |
| Bruce Water System | County of Adams | 210 | 0 | 51 |
| Othello Country Club Water Assn | County of Adams | 208 | 0 | 32 |
| Radar Mobile Home Park | County of Adams | 200 | 0 | 35 |
| Iglesia Bethel | County of Adams | 197 | 0 | 12 |
| Bird Dog Family Ltd Partnership Ii | County of Adams | 186 | 0 | 15 |
| Sportsman Trailer Park | County of Adams | 151 | 0 | 132 |
| Monsanto Co. | County of Adams | 150 | 0 | 1 |
| Warden Hutterian Brethren 1 | County of Adams | 126 | 0 | 3 |
| Hatton, Town Of | County of Adams | 105 | 0 | 0 |
| Sunburst Estates Water Assn | County of Adams | 100 | 0 | 0 |
| Meadow Lane Water Assn | County of Adams | 98 | 0 | 0 |
| Hi Lo Homeowners Assn | County of Adams | 87 | 0 | 0 |
| Ktw Orchards | County of Adams | 81 | 0 | 0 |
| West Side Mobile Court | County of Adams | 80 | 0 | 0 |
| Stahl Hutterian Brethren | County of Adams | 79 | 0 | 0 |
| Sect 11 Div 1 Ridgeview Water Assn | County of Adams | 79 | 0 | 0 |
| Fairview Domestic Water Assn | County of Adams | 75 | 0 | 0 |
| Rainier Tracts Water Assn | County of Adams | 61 | 0 | 0 |
| National Food Corp - Lind | County of Adams | 61 | 0 | 0 |
| Basin View Water Association | County of Adams | 60 | 0 | 0 |
| Monsanto Cunningham Rd | County of Adams | 59 | 0 | 0 |
| Highland Estates Water System | County of Adams | 52 | 0 | 0 |
| Canal Tracts Water System | County of Adams | 50 | 0 | 0 |
| Hoksbergen Development Llc | County of Adams | 49 | 0 | 0 |
| Schoonover Hutterian Brethren | County of Adams | 47 | 0 | 0 |
| Klingeman Well | County of Adams | 42 | 0 | 0 |
| Templins Inc | County of Adams | 41 | 0 | 0 |
| South Othello Water Users | County of Adams | 35 | 0 | 0 |
| Radar Water Association | County of Adams | 34 | 0 | 0 |
| Sunset Acres Water Association | County of Adams | 33 | 0 | 0 |
| Crestview Water Association | County of Adams | 31 | 0 | 0 |
| Benge School District | County of Adams | 30 | 0 | 0 |
| Garza Water System | County of Adams | 30 | 0 | 0 |
| Country Lane East | County of Adams | 27 | 0 | 0 |
| George System | County of Adams | 25 | 0 | 0 |
| Baring Water Department | County of Adams | 25 | 0 | 0 |
| Skunk Creek Water System | County of Adams | 25 | 0 | 0 |
| Adams Co Fire Dist #6 | County of Adams | 25 | 0 | 0 |
| Mc Kinley Indian Mission | County of Adams | 25 | 0 | 0 |
| Bench View Well | County of Adams | 24 | 0 | 0 |
| Golden Plains Mhp #2 | County of Adams | 24 | 0 | 0 |
| Meadowlane Well Ii | County of Adams | 19 | 0 | 0 |
| Four Seasons Campground | County of Adams | 15 | 0 | 0 |
| Potholeview Estates | County of Adams | 11 | 0 | 0 |
| Columbia National Wildlife Refuge | County of Adams | 10 | 0 | 0 |
| Ochoa Ag Unlimited Llc | County of Adams | 10 | 0 | 0 |
| Heeb Loran Ben Water System | County of Adams | 10 | 0 | 0 |
| Weeping Ridge Estate | County of Adams | 10 | 0 | 0 |
| Garza, Adan Jr | County of Adams | 8 | 0 | 0 |
| G & O Johnson | County of Adams | 6 | 0 | 0 |
| Vineyard Lane System I | County of Adams | 5 | 0 | 0 |
| Templin Terminal Llc | County of Adams | 4 | 0 | 0 |
| Hunter Hill Vineyards | County of Adams | 3 | 0 | 0 |