EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records

COUNTY WATER-SYSTEM LEDGER

Tuolumne, California

Compare active community water systems serving this county in EPA's public export. Systems can serve multiple places, so population totals may overlap.

Systems6active CWS · pop. 2,500+
Population served40,008reported total; may overlap
Current violation flag33.3%2 systems
Serious-violator flag0.0%0 systems

01 / SYSTEMS

Water systems serving Tuolumne

Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.

Water systemPopulation servedPrimary sourceCurrent export status
Tud - Upper Basin Water SystemCA551001213,280Surface waterNo current violation flagged
Tud - Sonora/Jamestown Water SystemCA551000111,054Surface waterNo current violation flagged
Tud - Columbia Water SystemCA55100135,463Surface waterNo current violation flagged
Cdcr - Sierra Conservation CenterCA55108513,571Surface waterNo current violation flagged
Groveland Community Serv DistCA55100093,400Surface waterCurrent health-based flag
Lake Don Pedro CsdCA55100083,240Surface waterCurrent health-based flag

02 / SOURCE MIX

Surface water6 systems · 40,008 served
How to read the population total

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.