Colonia Santa Maria
EPA ID: CA0707517 · 32 people served · 1 ZIP code
From the earliest to the most recent cycle in the five-year EPA window, Colonia Santa Maria has logged zero violations — no MCL exceedances, no health advisories, and no enforcement activity across the entire period for the 32 people in its service area, a record that stands up well against both state and national benchmarks.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 74% chance of violation in next 12 months
Violations went from 1 (2022) to 4 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Colonia Santa Maria Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Colonia Santa Maria serves a community with a median household income of $139,736 and an estimated 68,160 residents across its service area.
💧 Where Does Your Water Come From?
Colonia Santa Maria'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
Colonia Santa Maria (EPA ID: CA0707517) is a community water system in California that serves approximately 32 people from groundwater sources.
This system serves ZIP code 94513 in Brentwood.
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
- 94513 — Brentwood
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Colonia Santa Maria (CA0707517) on EPA.gov.
Frequently Asked Questions
Is Colonia Santa Maria water safe to drink?
Based on EPA records, Colonia Santa Maria has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Colonia Santa Maria serve?
Colonia Santa Maria serves approximately 32 people across 1 ZIP code in California.
Where does Colonia Santa Maria get its water?
The primary water source is groundwater.