COUNTY WATER-SYSTEM LEDGER
Stanislaus, California
EPA’s September 2026 export lists 12 active community water systems serving Stanislaus, California, with 3 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 Stanislaus, California
EPA associates 12 covered systems with Stanislaus, California; their reported population-served values total 472,787 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 |
|---|---|---|---|
| Modesto, City OfCA5010010 | 218,771 | Surface water purchased | No current violation flagged |
| Turlock, City OfCA5010019 | 72,682 | Surface water purchased | No current violation flagged |
| Ceres, City OfCA5010028 | 54,513 | Surface water purchased | Current health-based flag |
| Patterson, City OfCA5010017 | 24,977 | Ground water | No current violation flagged |
| Riverbank, City OfCA5010018 | 24,834 | Ground water | No current violation flagged |
| Oakdale, City OfCA5010014 | 23,235 | Ground water | Current health-based flag |
| City Of Modesto - SalidaCA5010005 | 14,537 | Surface water purchased | No current violation flagged |
| City Of Newman-Water DepartmentCA5010013 | 12,207 | Ground water | No current violation flagged |
| City Of WaterfordCA5010006 | 8,788 | Ground water | No current violation flagged |
| Hughson, City OfCA5010008 | 7,481 | Ground water | Current health-based flag |
| Keyes Community Services Dist.CA5010009 | 5,672 | Ground water | No current violation flagged |
| Denair Community Services DistrictCA5010021 | 5,090 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Stanislaus, California
EPA classifies 12 systems serving Stanislaus, California across 2 primary-source categories; Surface water purchased is the largest category with 4 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.