Drinking Water Systems in OAKLEY, California
8 water systems are reported for this city, with a combined service population of 44,728. The systems have 14 EPA violation records in the five-year period ending June 30, 2026.
Water Systems Serving OAKLEY
CAMINO MOBILEHOME
210 served6 historical records
A
BIG OAK MOBILE HOME PARK WATER
156 served5 historical records
A
OAKLEY MUTUAL WATER COMPANY
170 served9 historical records9 recent
F
DUTCH SLOUGH WATER WORKS
49 served5 historical records1 recent
B
DELTA MUTUAL WATER COMPANY
333 served9 historical records4 recent
D
WILLOW PARK MARINA
380 served0 historical records
A
KNIGHTSEN COMMUNITY WATER SYSTEM
73 served0 historical records
A
DIABLO WATER DISTRICT
43,357 served0 historical records
A
EPA Contaminant Categories in Historical Violation Records
Arsenic16 records
Gross Alpha7 records
Coliform (TCR)2 records
Lead and Copper Rule2 records
Category counts aggregate historical compliance records across listed systems. They do not show current concentrations or household test results.