Calleguas Municipal Water District
EPA ID: CA5610050 · 0 people served · 22 ZIP codes
Across every monitored period in the past five years, Calleguas Municipal Water District reported no EPA violations for its service population of 0.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 85% chance of violation in next 12 months
Violations went from 2 (2022) to 7 (2024). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Calleguas Municipal Water District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Calleguas Municipal Water District serves a community with a median household income of $131,911 and an estimated 721,820 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Calleguas Municipal Water District's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 2% of homes in Los Angeles 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 63th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 7 detections recorded. 3 exceed federal EPA limits (4 ppt for PFOA/PFOS). 3 exceed state limits.
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
Calleguas Municipal Water District (EPA ID: CA5610050) is a community water system in California that serves approximately 0 people from surface water sources.
This system provides water to 22 ZIP codes across 16 communities.
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
Coverage: 20 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 2 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 90265 — Malibu
- 91301 — Agoura Hills
- 91302 — Calabasas
- 91304 — Canoga Park
- 91307 — West Hills
- 91311 — Chatsworth
- 91320 — Newbury Park
- 91358 — Thousand Oaks
- 91360 — Thousand Oaks
- 91361 — Westlake Village
- 91362 — Thousand Oaks
- 91363 — Thousand Oaks
- 91377 — Oak Park
- 93010 — Camarillo
- 93012 — Camarillo
- 93021 — Moorpark
- 93033 — Oxnard
- 93036 — Oxnard
- 93063 — Simi Valley
- 93064 — Brandeis
- 93065 — Simi Valley
- 93066 — Somis
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Calleguas Municipal Water District (CA5610050) on EPA.gov.
Frequently Asked Questions
Is Calleguas Municipal Water District water safe to drink?
Based on EPA records, Calleguas Municipal Water District has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Calleguas Municipal Water District serve?
Calleguas Municipal Water District serves approximately 0 people across 22 ZIP codes in California.
Where does Calleguas Municipal Water District get its water?
The primary water source is surface water.