East Bay Municipal Utility District
EPA ID: CA0110005 · 1,442,800 people served · 86 ZIP codes
Federal compliance records for East Bay Municipal Utility District list 15 open violations that have not yet been resolved — the utility serves approximately 1,442,800 people, and each outstanding finding remains logged and active in the EPA enforcement database.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 94% chance of violation in next 12 months
Violations went from 6 (2021) to 12 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for East Bay Municipal Utility District Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The East Bay Municipal Utility District serves a community with a median household income of $122,884 and an estimated 1,866,623 residents across its service area. Approximately 75% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
East Bay Municipal Utility 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 1% of homes in Alameda 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.
Infrastructure Risk
Detected Contaminants
How East Bay Municipal Utility District compares to EPA limits
What This Means For You
Barium at 12 mg/L exceeds the EPA maximum of 2 mg/L.
Stage 2 DBP Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Combined Radium at 11 pCi/L exceeds the EPA maximum of 5 pCi/L.
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 76 detections recorded. 5 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 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
EAST BAY MUD (EPA ID: CA0110005) is a community water system in California that serves approximately 1,442,800 people from surface water sources.
This system provides water to 86 ZIP codes across 36 communities.
Average Home Safety Score: C (68/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| April 1, 2025 | Combined Radium | Health-based | Unresolved |
| January 1, 2025 | Combined Radium | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unresolved |
| October 1, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| October 1, 2024 | Combined Radium | Health-based | Unresolved |
| July 1, 2024 | Combined Radium | Monitoring | Unresolved |
| April 1, 2024 | Combined Radium | Monitoring | Unresolved |
| April 1, 2024 | Combined Radium | Health-based | Unresolved |
| January 1, 2024 | Combined Radium | Health-based | Unresolved |
| November 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| October 1, 2023 | Barium | Health-based | Unresolved |
| October 1, 2023 | Combined Radium | Health-based | Unresolved |
| October 1, 2023 | Stage 1 DBP Rule | Monitoring | Unresolved |
| September 1, 2023 | E. coli | Health-based | Unresolved |
| July 1, 2023 | Barium | Health-based | Unresolved |
| July 1, 2023 | Combined Radium | Health-based | Unresolved |
| April 1, 2023 | Barium | Health-based | Unresolved |
| April 1, 2023 | Combined Radium | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Barium | Inorganic | 12 | Yes |
| Combined Radium | Radionuclides | 11 | Yes |
| Stage 2 DBP Rule | Treatment Failure | 4 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| E. coli | Microbiological | 1 | Yes |
Health Risk Details
E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))
Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.
Removal methods: UV disinfection (99.99%), chlorination, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 94577 | 0.16 mg/L | Yes | N/A |
| 94578 | 0.16 mg/L | Yes | N/A |
| 94579 | 0.16 mg/L | Yes | N/A |
| 94506 | 0.008 mg/L | No | N/A |
| 94526 | 0.008 mg/L | No | N/A |
| 94556 | 0.0065 mg/L | No | N/A |
| 94575 | 0.0065 mg/L | No | N/A |
| 94563 | 0.0061 mg/L | No | N/A |
| 94601 | 0.0033 mg/L | No | N/A |
| 94602 | 0.0033 mg/L | No | N/A |
| 94603 | 0.0033 mg/L | No | N/A |
| 94604 | 0.0033 mg/L | No | N/A |
| 94605 | 0.0033 mg/L | No | N/A |
| 94606 | 0.0033 mg/L | No | N/A |
| 94607 | 0.0033 mg/L | No | N/A |
| 94609 | 0.0033 mg/L | No | N/A |
| 94610 | 0.0033 mg/L | No | N/A |
| 94611 | 0.0033 mg/L | No | N/A |
| 94612 | 0.0033 mg/L | No | N/A |
| 94613 | 0.0033 mg/L | No | N/A |
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: 70 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 16 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.
This system serves 86 ZIP codes:
94501 · 94502 · 94506 · 94507 · 94513 94514 · 94516 · 94517 · 94523 · 94525 94526 · 94528 · 94530 · 94541 · 94542 94544 · 94546 · 94547 · 94549 · 94551 94552 · 94553 · 94556 · 94563 · 94564 94569 · 94572 · 94575 · 94577 · 94578 94579 · 94580 · 94582 · 94583 · 94586 94588 · 94595 · 94596 · 94597 · 94598 94601 · 94602 · 94603 · 94604 · 94605 94606 · 94607 · 94608 · 94609 · 94610 94611 · 94612 · 94613 · 94614 · 94615 94617 · 94618 · 94619 · 94620 · 94621 94622 · 94623 · 94624 · 94649 · 94659 94660 · 94661 · 94662 · 94666 · 94701 94702 · 94703 · 94704 · 94705 · 94706 94707 · 94708 · 94709 · 94710 · 94712 94720 · 94801 · 94803 · 94804 · 94805 94806
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for East Bay Municipal Utility District (CA0110005) on EPA.gov.
Frequently Asked Questions
Is East Bay Municipal Utility District water safe to drink?
East Bay Municipal Utility District has recorded 14 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does East Bay Municipal Utility District serve?
East Bay Municipal Utility District serves approximately 1,442,800 people across 86 ZIP codes in California.
Where does East Bay Municipal Utility District get its water?
The primary water source is surface water.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from EBMUD Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: EBMUD Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Treatment classification and chemical list sourced from EBMUD Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
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 →
PFAS Substances Detected in This System
This water system's Consumer Confidence Report disclosed the following PFAS compounds. Levels are from the utility's most recent reporting cycle.
In April 2024, EPA finalized the first National Primary Drinking Water Regulation for six PFAS. Public water systems have until 2029 to comply. EPA — PFAS regulation overview →
Source: Consumer Confidence Report disclosed by EBMUD.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Aesthetic water quality
These measurements describe the look, taste, and feel of the water this utility delivers. They are not contaminant violations — they sit alongside federal Secondary Maximum Contaminant Levels (SMCLs) which the EPA publishes as non-enforceable guidance.
Aesthetic measurements from EBMUD Consumer Confidence Report.
Aesthetic measurements are reported by the utility from its annual sampling. EPA Secondary MCLs are advisory thresholds — values outside them indicate aesthetic concerns such as taste or appearance, not health violations. Federal contaminant testing is shown in the sections above.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
East Bay Municipal Utility District (EPA ID: CA0110005) — request the latest Consumer Confidence Report or ask about specific contaminants.