Oakley Mutual Water Company
EPA ID: CA0706004 · 170 people served · 1 ZIP code
Although compliance varies widely among water utilities nationally, Oakley Mutual Water Company stands out with zero EPA violations over five consecutive monitoring years, delivering safe tap water to 170 residents and showing no enforcement activity across the entire reporting span.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 4 (2024) to 11 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Oakley Mutual Water Company Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Oakley Mutual Water Company serves a community with a median household income of $130,859 and an estimated 45,386 residents across its service area.
💧 Where Does Your Water Come From?
Oakley Mutual Water Company's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Contra Costa County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Oakley Mutual Water Company (EPA ID: CA0706004) is a community water system in California that serves approximately 170 people from groundwater sources.
This system serves ZIP code 94561 in Oakley.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 94561 — Oakley
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Oakley Mutual Water Company (CA0706004) on EPA.gov.
Frequently Asked Questions
Is Oakley Mutual Water Company water safe to drink?
Based on EPA records, Oakley Mutual Water Company has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Oakley Mutual Water Company serve?
Oakley Mutual Water Company serves approximately 170 people across 1 ZIP code in California.
Where does Oakley Mutual Water Company get its water?
The primary water source is groundwater.