COUNTY WATER-SYSTEM LEDGER
Lake, California
EPA’s September 2026 export lists 10 active community water systems serving Lake, California, with 1 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Lake, California
EPA associates 10 covered systems with Lake, California; their reported population-served values total 48,293 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Highlands Mutual Water CompanyCA1710003 | 7,772 | Surface water | No current violation flagged |
| Hidden Valley Lake CsdCA1710015 | 6,235 | Ground water | No current violation flagged |
| Konocti County Water DistrictCA1710006 | 5,928 | Surface water | No current violation flagged |
| Lakeport, City OfCA1710004 | 4,762 | Surface water | No current violation flagged |
| Golden State Water Co.-Clearlake SystemCA1710002 | 4,644 | Surface water | No current violation flagged |
| Mt. Konocti Mutual Water CompanyCA1710014 | 4,360 | Surface water | No current violation flagged |
| Kelseyville Co Waterworks District 3CA1710007 | 4,102 | Ground water | No current violation flagged |
| Lake County Csa 21 - North LakeportCA1710021 | 4,046 | Surface water | No current violation flagged |
| Cobb Area County Water DistrictCA1710012 | 3,515 | Ground water | Current health-based flag |
| Nice Mutual Water CompanyCA1710008 | 2,929 | Surface water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Lake, California
EPA classifies 10 systems serving Lake, California across 2 primary-source categories; Surface water is the largest category with 7 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.