We found 65 public water systems in Colusa county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Caltrans-maxwell Reststops | County of Colusa | 15,000 | 0 | 0 |
| City Of Colusa | Colusa | 6,235 | 0 | 2 |
| City Of Williams | Williams | 5,255 | 0 | 3 |
| Arbuckle Public Utility District | County of Colusa | 2,300 | 0 | 3 |
| Maxwell Public Utility District | County of Colusa | 1,294 | 0 | 3 |
| Menf-fouts Springs Cg | County of Colusa | 504 | 0 | 0 |
| Colusa Industrial Properties | County of Colusa | 391 | 0 | 2 |
| Morning Star Pkg. Co.-wms. | County of Colusa | 390 | 0 | 0 |
| Colusa Co. Wwd #1 - Grimes | County of Colusa | 381 | 0 | 27 |
| Colusa Co. Wwd #2 - Princeton | County of Colusa | 356 | 0 | 0 |
| Colusa Co. Service Area #2-stonyford | County of Colusa | 250 | 0 | 4 |
| Colusa Co. Service Area #1-century Ranch | County of Colusa | 246 | 0 | 0 |
| Northern Truck Inc. | County of Colusa | 200 | 0 | 0 |
| Del Oro Wc - Arbuckle District | County of Colusa | 188 | 0 | 1 |
| Del Oro Water Co.-walnut Ranch | County of Colusa | 182 | 0 | 0 |
| Colusa Mobile Trailer Park | County of Colusa | 140 | 0 | 0 |
| Cruise N Tarry | County of Colusa | 135 | 0 | 0 |
| Arbuckle Golf Club | County of Colusa | 123 | 0 | 0 |
| Menf-letts Lake Cg | County of Colusa | 118 | 0 | 0 |
| Willow Creek M.w.c.-clarkville | County of Colusa | 110 | 0 | 0 |
| Richmond Hunting Club-maxwell | County of Colusa | 95 | 0 | 0 |
| Sun Valley Rice Company | County of Colusa | 94 | 0 | 0 |
| Adam's Vegetable Oils | County of Colusa | 90 | 0 | 0 |
| Wilbur Hot Springs | County of Colusa | 76 | 0 | 0 |
| Fouts Springs Youth Facility | County of Colusa | 70 | 0 | 0 |
| Wilderness Unlimited | County of Colusa | 63 | 0 | 0 |
| Richmond Hunting Club - Arbuckle | County of Colusa | 63 | 0 | 0 |
| Butte Lodge Duck Club | County of Colusa | 60 | 0 | 0 |
| Arbuckle Richmond Hunting Club | County of Colusa | 53 | 0 | 0 |
| Copa Cabana | County of Colusa | 50 | 0 | 0 |
| Bradley's Water Supply | County of Colusa | 50 | 0 | 0 |
| Grimes Boat And Landing | County of Colusa | 50 | 0 | 0 |
| American Rice, Inc. | County of Colusa | 50 | 0 | 0 |
| Wadham Energy | County of Colusa | 50 | 0 | 0 |
| Adm Rice Inc. | County of Colusa | 50 | 0 | 0 |
| La Escondida | County of Colusa | 50 | 0 | 0 |
| Terhel Farms Trailer Park #2 | County of Colusa | 50 | 0 | 0 |
| Lodoga Inn | County of Colusa | 40 | 0 | 0 |
| Northern California Duck Club | County of Colusa | 40 | 0 | 0 |
| De Vor Nurseries | County of Colusa | 35 | 0 | 0 |
| Willow Creek M.w.c.-lambertville | County of Colusa | 31 | 0 | 0 |
| Olam Spices And Vegetable Ingredients | County of Colusa | 31 | 0 | 0 |
| Porter Independent Enterprises | County of Colusa | 30 | 0 | 0 |
| Cinti & Schramm Duck Club | County of Colusa | 30 | 0 | 0 |
| Kingdom Hall Of Jehovah's Witness-wms | County of Colusa | 26 | 0 | 0 |
| Squaw Creek Water System | County of Colusa | 25 | 0 | 0 |
| River Vista Farms | County of Colusa | 25 | 0 | 0 |
| Terhel Farms Trailer Park 01 | County of Colusa | 25 | 0 | 0 |
| Four Corners Station | County of Colusa | 25 | 0 | 0 |
| Colusa Airport | County of Colusa | 25 | 0 | 0 |
| Halsey Water Supply | County of Colusa | 25 | 0 | 0 |
| Colusa Landing | County of Colusa | 25 | 0 | 0 |
| Ward's Boat Landing | County of Colusa | 25 | 0 | 0 |
| White Mallard Duck Club | County of Colusa | 25 | 0 | 0 |
| Ternel Farms Inc | County of Colusa | 25 | 0 | 0 |
| Ron Barnes | County of Colusa | 25 | 0 | 0 |
| Miramontes Camp | County of Colusa | 25 | 0 | 0 |
| Mayberry Water System | County of Colusa | 25 | 0 | 0 |
| Colusa Tractor Company | County of Colusa | 22 | 0 | 0 |
| I G Zumwalt | County of Colusa | 15 | 0 | 0 |
| ZUMALT I G REESE ORCHARD | County of Colusa | 15 | 0 | 0 |
| Vann Brothers Labor Camp | County of Colusa | 15 | 0 | 0 |
| Kalfsbeek Labor Camp | County of Colusa | 10 | 0 | 0 |
| Sundown Drive-in Theater | County of Colusa | 1 | 0 | 0 |
| Villa Almendra | County of Colusa | 0 | 0 | 0 |