Drinking water quality · 2026
· Verified
What's in SFPUC City Distribution Division, CA tap water
34 contaminants were measured in the SFPUC City Distribution Division, CA water system's 2026 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2026
- Contaminants measured
- 34
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- Chromium, Hexavalent
- Service area
- CA
Where your water comes from · EPA SDWIS
SFPUC City Distribution Division, CA's drinking water comes from ground water, drawn from 7 sources.
Source
- ZOO
- LAKE MERCED WELL
- WEST SUNSET WELL
- SOUTH SUNSET WELL
- + 3 more
Treatment
- WEST SUNSET CHLORINATION TREATMENT
- ZOO WELL 05 WELLHEAD TREATMENT
Distribution
Also buys water from SAN FRANCISCO REGIONAL WATER SYSTEM.
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in SFPUC City Distribution Division, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
NITRATE worst: 2019 | 13.6 mg/L 1.4× | 10 mg/L | '18'19 |
NITRATE NITRITE worst: 2018 | 11 mg/L 1.1× | 10 mg/L | '18'19 |
PCE worst: 2019 | 0.00247 mg/L within | 0.005 mg/L | '18'19 |
ARSENIC worst: 2016 | 0.0026 mg/L within below national p90 | 0.01 mg/L | '16'17 |
CHROMIUM worst: 2018 | 0.0216 mg/L within 2.2× the national p90 | 0.1 mg/L | '18'19 |
CARBON TETRACHLORIDE worst: 2019 | 0.00099 mg/L within below national p90 | 0.005 mg/L | '18'19 |
FLUORIDE worst: 2016 | 0.677 mg/L within | 4 mg/L | '15'16'18 |
COPPER worst: 2017 | 0.269 mg/L below national p90 | — | '17 |
LEAD worst: 2017 | 0.00673 mg/L | — | '17 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 16.52 UG/LAverageSource water | 10 UG/LMCL | At or above the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 39.875 UG/LAverageDistribution | 80 UG/LMCL | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 23.791666666666668 UG/LAverageDistribution | 60 UG/LMCL | Within the limit |
| BromoformA trihalomethane disinfection byproduct. | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 4.876666666666667 UG/LAverageDistribution | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 33.333333333333336 UG/LAverageDistribution | None set | Detected — no federal limit |
| DibromochloromethaneA trihalomethane disinfection byproduct. | 1.8016666666666667 UG/LAverageDistribution | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Dbaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Mbaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Mcaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Dcaa | 12.741666666666667 UG/LAverageDistribution | None set | Detected — no federal limit |
| Tcaa | 11.038333333333334 UG/LAverageDistribution | None set | Detected — no federal limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| 4:2 Fluorotelomer sulfonic acid (4:2 FTS)4:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| 6:2 Fluorotelomer sulfonic acid (6:2 FTS)6:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| 8:2 Fluorotelomer sulfonic acid (8:2 FTS)8:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound. | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected NG/LHighest single sampleSource water | None set | None detected |
People also ask about SFPUC City Distribution Division, CA's water
+Is SFPUC City Distribution Division, CA tap water safe to drink in 2026?
The 2026 Consumer Confidence Report for the SFPUC City Distribution Division, CA water utility lists 2 contaminants at or above the federal limit: Chromium, Hexavalent and Carbon Tetrachloride. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in SFPUC City Distribution Division, CA tap water?
34 contaminants were measured in SFPUC City Distribution Division, CA's 2026 Consumer Confidence Report, spanning pfas ("forever chemicals"), other, and disinfection byproducts. 5 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in SFPUC City Distribution Division, CA tap water?
2 contaminants in SFPUC City Distribution Division, CA's 2026 report sit at or above the federal limit: Chromium, Hexavalent (1.7× the limit); Carbon Tetrachloride (1.2× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in SFPUC City Distribution Division, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2026 report is Chromium, Hexavalent, at 1.7× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from SFPUC City Distribution Division, CA's 2026 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is SFPUC City Distribution Division, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2026 report; a new report will replace it once the utility publishes its next annual update.