Drinking Water Systems in PATTERSON, California
2 water systems are reported for this city, with a combined service population of 26,977. The systems have 0 EPA violation records in the five-year period ending June 30, 2026.
Water Systems Serving PATTERSON
WESTERN HILLS WATER DISTRICT/DIABLO GRAN
2,000 served35 historical records
A
PATTERSON, CITY OF
24,977 served4 historical records
A
EPA Contaminant Categories in Historical Violation Records
Total Trihalomethanes (TTHMs)19 records
Haloacetic Acids (HAA5)6 records
Coliform (TCR)4 records
Surface Water Treatment Rule3 records
CARBON, TOTAL1 record
Lead and Copper Rule1 record
Consumer Confidence Rule1 record
Nitrate1 record
Category counts aggregate historical compliance records across listed systems. They do not show current concentrations or household test results.