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Tap water quality report

San Francisco Regional Water

EPA monitoring tested this supplier for 109 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
12
detected
600
people served
10
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
San Francisco

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.

10
health-based violations
14
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1998-06-01 → 1998-10-01
TT Health-based Resolved 1998-06-01 → 1998-10-01
TT Health-based Resolved 1995-08-01 → 1995-09-30
TT Health-based Resolved 1995-03-01 → 1995-04-01
TT Health-based Resolved 1995-03-01 → 1995-04-01
TT Health-based Resolved 1995-03-01 → 1995-04-01
TT Health-based Resolved 1993-06-01 → 1993-06-30
TT Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1991-04-01 → 1991-04-30
MCL Health-based Resolved 1991-04-01 → 1991-04-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Fluoride
900 µg/L 23%
of the EPA limit 4000 µg/L
 88/133 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2024
Nitrate
21400 µg/L 214%
of the EPA limit, in the worst sample — 10000 µg/L
 16/214 SYR4 2012–2019
Arsenic
3 µg/L 30%
of the EPA limit 10 µg/L
 7/135 SYR4 2012–2019
Nitrate-Nitrite
400000 µg/L 4000%
of the EPA limit, in the worst sample — 10000 µg/L
 7/86 SYR4 2012–2019
Barium
178.25 µg/L 8.9%
of the EPA limit 2000 µg/L
 5/134 SYR4 2012–2019
Chromium
26.2 µg/L 26%
of the EPA limit 100 µg/L
 5/135 SYR4 2012–2019
Bromodichloromethane
5.5 µg/L
No EPA limit set
 1/2 SYR4 2018
Chloroform
32 µg/L
No EPA limit set
 1/2 SYR4 2018
Combined Radium (-226 And -228)
3.8 pCi/L 76%
of the EPA limit 5 pCi/L
 1/7 SYR4 2015–2019
Nitrite
400 µg/L 40%
of the EPA limit 1000 µg/L
 1/112 SYR4 2012–2019
TTHM
38 µg/L 48%
of the EPA limit 80 µg/L
 1/2 SYR4 2018
97 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, TotalBromateBromoformChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloriteCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DEGRACA, ANDREW
Phone
650-652-3100
Email
ADEGRACA@SFWATER.ORG

Frequently asked questions about San Francisco Regional Water

Is San Francisco Regional Water tap water safe to drink?

EPA monitoring detected 12 contaminants in San Francisco Regional Water'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 San Francisco Regional Water's water?

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

How many people does San Francisco Regional Water serve?

San Francisco Regional Water reports serving 600 people in California, per its EPA record.

Has San Francisco Regional Water had any water quality violations?

The EPA has 14 violations on file for San Francisco Regional Water, of which 10 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.