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Tap water quality report

East Bay Mud

EPA monitoring tested this supplier for 102 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
11
detected
1,442,800
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
Alameda

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

2
health-based violations
10
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-08-23 → 1995-12-13
MCL Health-based Resolved 1995-08-23 → 1995-12-13
Other Monitoring Resolved 1995-11-01 → 1995-11-30
Other Monitoring Resolved 1995-11-01 → 1995-11-30
MR Monitoring Resolved 1994-07-01 → 1994-07-31
MR Monitoring Resolved 1994-07-01 → 1994-07-31
MR Monitoring Resolved 1994-07-01 → 1994-07-31
MR Monitoring Resolved 1994-07-01 → 1994-07-31
MR Monitoring Resolved 1992-09-01 → 1992-09-30
MR Monitoring Resolved 1992-09-01 → 1992-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0052 µg/L 2/19 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Fluoride
900 µg/L 23%
of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L
966/1001 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 31/31 LCR 2024
Nitrate
549.18 µg/L 5.5%
of the EPA limit 10000 µg/L
 20/1948 SYR4 2012–2019
Gross Beta Particle Activity
3.1485 pCi/L
No EPA limit set
worst single sample: 4 pCi/L
14/16 SYR4 2012–2019
Nitrate-Nitrite
534000 µg/L 5340%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 540000 µg/L
13/965 SYR4 2012–2019
Combined Uranium
1.25607 µg/L 4.2%
of the EPA limit 30 µg/L
worst single sample: 1.49 µg/L
6/14 SYR4 2012–2019
Asbestos
1.08 MFL 15%
of the EPA limit 7 MFL
worst single sample: 1.2 MFL
5/43 SYR4 2012–2019
Arsenic
4.44 µg/L 44%
of the EPA limit 10 µg/L
worst single sample: 4.6 µg/L
3/66 SYR4 2012–2019
Chromium
12 µg/L 12%
of the EPA limit 100 µg/L
 1/66 SYR4 2012–2019
Lead
6.6 µg/L 44%
of the EPA limit 15 µg/L
 1/67 SYR4 2012–2019
91 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromateChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CORTEZ, ROBERTO
Phone
510-287-1035
Email
[email protected]

Frequently asked questions about East Bay Mud

Is East Bay Mud tap water safe to drink?

EPA monitoring detected 11 contaminants in East Bay Mud's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in East Bay Mud's water?

EPA monitoring detected Fluoride, Lead, Nitrate, Gross Beta Particle Activity, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does East Bay Mud serve?

East Bay Mud reports serving 1,442,800 people in California, per its EPA record.

Has East Bay Mud had any water quality violations?

The EPA has 10 violations on file for East Bay Mud, of which 2 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.