Eastern Municipal Water District
EPA ID: CA3310009 · 666,581 people served · 33 ZIP codes
ZipCheckup's reading of EPA SDWIS for Eastern Municipal Water District (CA3310009): no EPA violations recorded in the last five years. From the earliest to the most recent cycle in the five-year EPA window, Eastern Municipal Water District has logged zero violations - no MCL exceedances, no health advisories, and no enforcement activity across the entire period for the 666,581 people in its service area, a record that stands up well against both state and national benchmarks.
Data: EPA SDWIS
Service Area Map
Coverage area for Eastern Municipal Water District Source: EPA SDWIS service area boundaries.
Service area boundary - Grade B
Service Area Demographics
The Eastern Municipal Water District serves a community with a median household income of $88,168 and an estimated 1,286,652 residents across its service area. Approximately 40% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 44% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
Eastern 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.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 106 detections recorded. 19 exceed federal EPA limits (4 ppt for PFOA/PFOS). 13 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
Eastern Municipal Water District (EPA ID: CA3310009) is a community water system in California that serves approximately 666,581 people from surface water sources.
This system provides water to 33 ZIP codes across 18 communities.
ZIP-Area Home Safety Context: B (70/100)
This is the average Home Safety Score for 21 of 33 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0028 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.
This system serves 33 ZIP codes:
92503 · 92504 · 92507 · 92508 · 92518 92532 · 92536 · 92539 · 92543 · 92544 92545 · 92548 · 92551 · 92553 · 92555 92557 · 92561 · 92562 · 92563 · 92567 92570 · 92571 · 92582 · 92583 · 92584 92585 · 92586 · 92587 · 92590 · 92591 92592 · 92595 · 92596
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Eastern Municipal Water District (CA3310009) on EPA.gov.
Frequently Asked Questions
Is Eastern Municipal Water District water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Eastern Municipal Water District in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Eastern Municipal Water District serve?
Eastern Municipal Water District serves approximately 666,581 people across 33 ZIP codes in California.
Where does Eastern Municipal Water District get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Eastern Municipal Water District, CA: Serves 667K People. https://zipcheckup.com/water-system/ca3310009/
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url = {https://zipcheckup.com/water-system/ca3310009/}
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