COUNTY WATER-SYSTEM LEDGER
Tuolumne, California
EPA’s September 2026 export lists 6 active community water systems serving Tuolumne, California, with 2 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 Tuolumne, California
EPA associates 6 covered systems with Tuolumne, California; their reported population-served values total 40,008 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 |
|---|---|---|---|
| Tud - Upper Basin Water SystemCA5510012 | 13,280 | Surface water | No current violation flagged |
| Tud - Sonora/Jamestown Water SystemCA5510001 | 11,054 | Surface water | No current violation flagged |
| Tud - Columbia Water SystemCA5510013 | 5,463 | Surface water | No current violation flagged |
| Cdcr - Sierra Conservation CenterCA5510851 | 3,571 | Surface water | No current violation flagged |
| Groveland Community Serv DistCA5510009 | 3,400 | Surface water | Current health-based flag |
| Lake Don Pedro CsdCA5510008 | 3,240 | Surface water | Current health-based flag |
02 / SOURCE MIX
Primary water sources for Tuolumne, California
EPA classifies 6 systems serving Tuolumne, California across 1 primary-source categories; Surface water is the largest category with 6 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.