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Tap water quality report

City of East Palo Alto

EPA monitoring tested this supplier for 112 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

112
contaminants tested
17
detected
29,519
people served
14
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Local government
Counties served
San Mateo

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.

14
health-based violations
22
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2015-03-01 → 2015-03-31
TT Health-based Resolved 2015-03-01 → 2015-03-31
MCL Health-based Resolved 2014-06-01 → 2014-06-30
MCL Health-based Resolved 2014-06-01 → 2014-06-30
MCL Health-based Resolved 2014-05-01 → 2014-05-31
MCL Health-based Resolved 2014-05-01 → 2014-05-31
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 1999-08-01 → 1999-08-31
MCL Health-based Resolved 1999-08-01 → 1999-08-31

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
Dichloroacetic Acid
25 µg/L
No EPA limit set
worst single sample: 26.6 µg/L
113/113 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
51.7 µg/L 86%
of the EPA limit 60 µg/L
worst single sample: 59.8 µg/L
113/113 SYR4 2012–2019
Chloroform
62.25 µg/L
No EPA limit set
worst single sample: 65.3 µg/L
110/110 SYR4 2012–2019
TTHM
63.01 µg/L 79%
of the EPA limit 80 µg/L
worst single sample: 67.6 µg/L
110/110 SYR4 2012–2019
Trichloroacetic Acid
26.96 µg/L
No EPA limit set
worst single sample: 28.9 µg/L
109/113 SYR4 2012–2019
Bromodichloromethane
6.1 µg/L
No EPA limit set
worst single sample: 8.01 µg/L
91/111 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 49/49 LCR 2023
Dibromochloromethane
1.36 µg/L
No EPA limit set
worst single sample: 1.42 µg/L
29/110 SYR4 2012–2019
Monochloroacetic Acid
3.4 µg/L
No EPA limit set
worst single sample: 6.9 µg/L
21/113 SYR4 2012–2019
Bromoform
0.5000 µg/L
No EPA limit set
 19/111 SYR4 2012–2019
Dibromoacetic Acid
1 µg/L
No EPA limit set
 18/113 SYR4 2012–2019
Monobromoacetic Acid
3.26 µg/L
No EPA limit set
worst single sample: 3.6 µg/L
18/113 SYR4 2012–2019
Barium
364.8 µg/L 18%
of the EPA limit 2000 µg/L
worst single sample: 366 µg/L
5/5 SYR4 2015–2019
Fluoride
117.9 µg/L 2.9%
of the EPA limit 4000 µg/L
worst single sample: 120 µg/L
4/5 SYR4 2015–2019
Arsenic
3.3 µg/L 33%
of the EPA limit 10 µg/L
 1/5 SYR4 2015–2019
Cyanide
220 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 200 µg/L
 1/10 SYR4 2015–2019
Selenium
5.3 µg/L 11%
of the EPA limit 50 µg/L
 1/5 SYR4 2015–2019
95 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
VINING, MATTHEW
Phone
650-229-3818
Email
[email protected]

Frequently asked questions about City of East Palo Alto

Is City of East Palo Alto tap water safe to drink?

EPA monitoring detected 17 contaminants in City of East Palo Alto'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 City of East Palo Alto's water?

EPA monitoring detected Dichloroacetic Acid, Total Haloacetic Acids (HAA5), Chloroform, TTHM, Trichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does City of East Palo Alto serve?

City of East Palo Alto reports serving 29,519 people in California, per its EPA record.

Has City of East Palo Alto had any water quality violations?

The EPA has 22 violations on file for City of East Palo Alto, of which 14 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.