We found 122 public water systems in Modoc county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Modoc District Fair | County of Modoc | 3,500 | 0 | 0 |
| Modoc County Fair | County of Modoc | 3,025 | 0 | 0 |
| City Of Alturas | Alturas | 2,982 | 0 | 5 |
| Lower Rush Creek Campground | County of Modoc | 825 | 0 | 0 |
| Cedarville County Water Dist. | County of Modoc | 500 | 0 | 3 |
| Newell County Water District | County of Modoc | 300 | 0 | 12 |
| California Pines C.s.d. | County of Modoc | 300 | 0 | 8 |
| Newell County Water District | County of Modoc | 300 | 0 | 0 |
| Arps Trailer Park | County of Modoc | 270 | 0 | 0 |
| Modoc National Wildlife Refuge | County of Modoc | 250 | 0 | 0 |
| Blue Lake Campground | County of Modoc | 235 | 0 | 0 |
| Palo Verde County Water Dist | Palo Verde | 233 | 0 | 0 |
| Adin Community Park | County of Modoc | 225 | 0 | 0 |
| I'sot Well #3 & #15 | County of Modoc | 215 | 0 | 1 |
| Mdf-blue Lake Cg | County of Modoc | 200 | 0 | 6 |
| East Tule Lake Water Dist | County of Modoc | 192 | 0 | 0 |
| East Tule Lake Water Dist | County of Modoc | 192 | 0 | 0 |
| Adin Inn | County of Modoc | 125 | 0 | 0 |
| Alamo Restaurant | County of Modoc | 125 | 0 | 0 |
| Deer Springs Campground | County of Modoc | 125 | 0 | 0 |
| Honker Cove Campground | County of Modoc | 125 | 0 | 0 |
| Pine Cone Campground | County of Modoc | 125 | 0 | 0 |
| Patterson Guard Station | County of Modoc | 121 | 0 | 0 |
| Stowe Reservoir Campground | County of Modoc | 121 | 0 | 0 |
| Cal Fire-devil's Garden Camp | County of Modoc | 120 | 0 | 0 |
| Calif Pines Comm Serv Dist | County of Modoc | 120 | 0 | 0 |
| Mill Creek Falls Campground | County of Modoc | 90 | 0 | 0 |
| Stronghold H20 District | County of Modoc | 81 | 0 | 0 |
| Stronghold H20 District | County of Modoc | 81 | 0 | 0 |
| Big Valley Primary School | County of Modoc | 80 | 0 | 0 |
| Bill Tierney | County of Modoc | 78 | 0 | 0 |
| Far East Water District | County of Modoc | 78 | 0 | 0 |
| Soup Springs Campground | County of Modoc | 70 | 0 | 0 |
| Mdf-mill Creek Falls Cg | County of Modoc | 60 | 0 | 0 |
| Canby Hotel & Restaurant | County of Modoc | 60 | 0 | 0 |
| Isot Inc Well 16 Isot School | County of Modoc | 60 | 0 | 0 |
| Modoc Livestock | County of Modoc | 60 | 0 | 0 |
| Upper Rush Creek Campground | County of Modoc | 60 | 0 | 0 |
| Mdf-ambrose | County of Modoc | 55 | 0 | 0 |
| Ambrose Well | County of Modoc | 55 | 0 | 0 |
| Calandor Pine Corp | County of Modoc | 54 | 0 | 0 |
| Mdf-adin Ranger Station | County of Modoc | 50 | 0 | 0 |
| Cottonwood Flat Campground | County of Modoc | 50 | 0 | 0 |
| Isot Inc | County of Modoc | 50 | 0 | 0 |
| Nelson's Frosty | County of Modoc | 50 | 0 | 0 |
| Cold Spring Soadside Ftn | County of Modoc | 50 | 0 | 0 |
| Cold Spring Roadside Fountain | County of Modoc | 50 | 0 | 0 |
| Northeast H20 District | County of Modoc | 48 | 0 | 0 |
| Cederville Trailer Park | County of Modoc | 42 | 0 | 0 |
| Mdf-stough Reservoir Cg | County of Modoc | 40 | 0 | 0 |
| Mdf-canby Work Center | County of Modoc | 40 | 0 | 0 |
| Belly Acres R V Park | County of Modoc | 40 | 0 | 0 |
| I'sot Well #10 | County of Modoc | 40 | 0 | 0 |
| Drifters Inn | County of Modoc | 40 | 0 | 0 |
| Butte Creek Mobile Home Park | County of Modoc | 40 | 0 | 0 |
| Arlington Elementary School | County of Modoc | 37 | 0 | 0 |
| Mjusd-arlington Elem. School | County of Modoc | 35 | 0 | 0 |
| Mjusd-south Fork Elementary School | County of Modoc | 35 | 0 | 0 |
| Allerton Motel | County of Modoc | 35 | 0 | 0 |
| Sulley's Trailer Lodge | County of Modoc | 30 | 0 | 0 |
| Ash Creek Campground | County of Modoc | 30 | 0 | 0 |
| New Pine Tavern | County of Modoc | 30 | 0 | 0 |
| Lillylake Picnic Site | County of Modoc | 30 | 0 | 0 |
| New Pine Tavern | County of Modoc | 30 | 0 | 0 |
| Hawks Nest | County of Modoc | 30 | 0 | 0 |
| Mdf-cedar Creek | County of Modoc | 25 | 0 | 0 |
| Likely; Lassen Land And Trail Trust | County of Modoc | 25 | 0 | 0 |
| Department Of Transportation | County of Modoc | 25 | 0 | 0 |
| Calif Food And Ag, Dpi | County of Modoc | 25 | 0 | 0 |
| Department Of Transportation | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Knob Hill Store | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 25 | 0 | 0 |
| Likely Place, Inc. | County of Modoc | 25 | 0 | 0 |
| Plum Valley Campground | County of Modoc | 25 | 0 | 0 |
| Big Valley Primary School | County of Modoc | 25 | 0 | 0 |
| Mnf-upper Rush Creek Cg | County of Modoc | 25 | 0 | 0 |
| Adin Ranger Station | County of Modoc | 25 | 0 | 0 |
| Modoc Mule | County of Modoc | 25 | 0 | 0 |
| Spike Hilton Recreation Site | County of Modoc | 25 | 0 | 0 |
| Calif Dept Of Food & Ag | County of Modoc | 25 | 0 | 0 |
| Spike Hilton Campground | County of Modoc | 25 | 0 | 0 |
| California Pines | County of Modoc | 25 | 0 | 0 |
| Calif Dept Of Food & Ag | County of Modoc | 25 | 0 | 0 |
| Butte Creek Trailer Park | Nc Nevada Falls | 25 | 0 | 0 |
| Soup Springs Campground | County of Modoc | 24 | 0 | 0 |
| Cave Lake Campground | County of Modoc | 20 | 0 | 0 |
| Patterson Guard Station | County of Modoc | 20 | 0 | 0 |
| Cottonwood Flat Campground | County of Modoc | 20 | 0 | 0 |
| Lower Rush Creek Campground | County of Modoc | 20 | 0 | 0 |
| Pepperdine Campground | County of Modoc | 20 | 0 | 0 |
| Honker Cove Campground | County of Modoc | 20 | 0 | 0 |
| Deer Spring Campground | County of Modoc | 20 | 0 | 0 |
| Pine Cone Campground | County of Modoc | 20 | 0 | 0 |
| Adin Community Park | County of Modoc | 20 | 0 | 0 |
| Fort Bidwell Hotel | County of Modoc | 20 | 0 | 0 |
| I'sot Well #12 | County of Modoc | 10 | 0 | 0 |
| Lassen Creek Campground | County of Modoc | 10 | 0 | 0 |
| Long Bell Guard Station | County of Modoc | 5 | 0 | 0 |
| Long Bell Guard Station | County of Modoc | 5 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 0 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 0 | 0 | 0 |
| Usfs Modoc Nf | County of Modoc | 0 | 0 | 0 |
| Canby Community Services District | County of Modoc | 0 | 0 | 0 |
| Calandor Pine Corporation | County of Modoc | 0 | 0 | 0 |
| South Fork School | County of Modoc | 0 | 0 | 0 |
| Eagles Nest Ranch Rv Park | County of Modoc | 0 | 0 | 0 |