Water Quality: Oakley, CA
8 water systems • 44,728 people served
Multiple Health ViolationsWater Quality Summary
Oakley is served by 8 public water systems with a combined service population of 44,728 people, and has 93 EPA Safe Drinking Water Act violations on record. Critically, 86 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Oakley's violation count is 94% above the national average for California. Contaminants associated with violations include Barium, Stage 2 DBP.
Contaminants Found
Increases blood pressure and causes cardiovascular effects with long-term exposure.
Common source: Natural rock deposits, oil drilling operations, coal power plant waste
EPA limit: 2 mg/L
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Oakley
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| DIABLO WATER DISTRICT | CA0710007 | Surface Water | 43,357 | 0 |
| WILLOW PARK MARINA | CA0707507 | Groundwater | 380 | 26 |
| DELTA MUTUAL WATER COMPANY | CA0707573 | Groundwater | 333 | 38 |
| CAMINO MOBILEHOME | CA0707598 | Groundwater | 210 | 1 |
| OAKLEY MUTUAL WATER COMPANY | CA0706004 | Groundwater | 170 | 25 |
| BIG OAK MOBILE HOME PARK WATER | CA0707588 | Groundwater | 156 | 0 |
| KNIGHTSEN COMMUNITY WATER SYSTEM | CA0707547 | Groundwater | 73 | 0 |
| DUTCH SLOUGH WATER WORKS | CA0707519 | Groundwater | 49 | 3 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in California
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.