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.
3
health-based violations
5
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 1993-06-01 → 1993-06-30 |
| TT | Health-based | Resolved | 1993-06-01 → 1993-06-30 |
| MCL | Health-based | Resolved | 1992-10-01 → 1992-10-31 |
| MR | Monitoring | Resolved | 2013-06-01 |
| MR | Monitoring | Resolved | 2013-06-01 |
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.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 6736 µg/L 67% of the EPA limit 10000 µg/L
worst single sample: 8606 µg/L | 1060/1148 | SYR4 | 2012–2019 |
| TTHM | 51.34 µg/L 64% of the EPA limit 80 µg/L
worst single sample: 100 µg/L | 364/418 | SYR4 | 2012–2019 |
| Bromodichloromethane | 4.5755 µg/L No EPA limit set
worst single sample: 18 µg/L | 348/418 | SYR4 | 2012–2019 |
| Chloroform | 51.176 µg/L No EPA limit set
worst single sample: 77 µg/L | 327/418 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 46 µg/L 77% of the EPA limit 60 µg/L
worst single sample: 56 µg/L | 264/265 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set
worst single sample: 34 µg/L | 263/266 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 17 µg/L No EPA limit set
worst single sample: 24 µg/L | 263/266 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.098 µg/L No EPA limit set
worst single sample: 5.3 µg/L | 249/418 | SYR4 | 2012–2019 |
| Arsenic | 9.81355 µg/L 98% of the EPA limit 10 µg/L
worst single sample: 16.211 µg/L | 204/263 | SYR4 | 2012–2019 |
| Bromoform | 3.356 µg/L No EPA limit set
worst single sample: 5.67 µg/L | 189/418 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 3.005 µg/L No EPA limit set
worst single sample: 3.4 µg/L | 80/266 | SYR4 | 2012–2019 |
| Chromium | 13.7722 µg/L 14% of the EPA limit 100 µg/L
worst single sample: 21 µg/L | 48/92 | SYR4 | 2012–2019 |
| Copper | 52.3142 µg/L 4% of the EPA limit 1300 µg/L
worst single sample: 73.33 µg/L | 44/163 | SYR4 | 2012–2019 |
| Combined Uranium | 2.0895 µg/L 7% of the EPA limit 30 µg/L
worst single sample: 2.57472 µg/L | 36/77 | SYR4 | 2012–2019 |
| Antimony, Total | 0.1208 µg/L 2% of the EPA limit 6 µg/L
worst single sample: 0.1320 µg/L | 29/89 | SYR4 | 2012–2019 |
| 1,2-Dichloropropane | 1.015 µg/L 20% of the EPA limit 5 µg/L
worst single sample: 1.04 µg/L | 27/373 | SYR4 | 2012–2019 |
| Lead | 2.9949 µg/L 20% of the EPA limit 15 µg/L
worst single sample: 5.359 µg/L | 27/89 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 2.87 µg/L No EPA limit set
worst single sample: 3.1 µg/L | 27/266 | SYR4 | 2012–2019 |
| Lead | 0.0041 mg/L 27% of the EPA limit 0.0150 mg/L | 26/26 | LCR | 2025 |
| Barium | 180 µg/L 9% of the EPA limit 2000 µg/L
worst single sample: 190 µg/L | 21/39 | SYR4 | 2012–2019 |
| Selenium | 1.5479 µg/L 3.1% of the EPA limit 50 µg/L
worst single sample: 2.23 µg/L | 20/83 | SYR4 | 2012–2019 |
| Cadmium | 0.0135 µg/L 0.3% of the EPA limit 5 µg/L
worst single sample: 0.0270 µg/L | 16/88 | SYR4 | 2012–2019 |
| Beryllium, Total | 0.0078 µg/L 0.2% of the EPA limit 4 µg/L
worst single sample: 0.0100 µg/L | 12/85 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 7325 µg/L 73% of the EPA limit 10000 µg/L
worst single sample: 7400 µg/L | 4/7 | SYR4 | 2017–2019 |
| Fluoride | 139 µg/L 3.5% of the EPA limit 4000 µg/L
worst single sample: 140 µg/L | 3/21 | SYR4 | 2012–2019 |
| Trichloroethylene | 0.7370 µg/L 15% of the EPA limit 5 µg/L
worst single sample: 0.7500 µg/L | 3/373 | SYR4 | 2012–2019 |
| Thallium, Total | 0.0224 µg/L 1.1% of the EPA limit 2 µg/L
worst single sample: 0.0230 µg/L | 2/86 | SYR4 | 2012–2019 |
| Lithium | 23.6 µg/L No EPA limit set | 2/6 | UCMR-5 | 2025 |
| Mercury | 0.0130 µg/L 0.7% of the EPA limit 2 µg/L | 1/23 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set | 1/266 | SYR4 | 2012–2019 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromateChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about California Water Service-S San Francisco
Is California Water Service-S San Francisco tap water safe to drink?
EPA monitoring detected 30 contaminants in California Water Service-S San Francisco'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 California Water Service-S San Francisco's water?
EPA monitoring detected Nitrate, TTHM, Bromodichloromethane, Chloroform, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does California Water Service-S San Francisco serve?
California Water Service-S San Francisco reports serving 64,146 people in California, per its EPA record.
Has California Water Service-S San Francisco had any water quality violations?
The EPA has 5 violations on file for California Water Service-S San Francisco, of which 3 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.