Is City of Daly City Tap Water Safe? Quality Report

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2003-12-01 → 2003-12-31
MCL	Health-based	Resolved	2003-12-01 → 2003-12-31
MCL	Health-based	Resolved	2000-05-01 → 2000-05-31
MCL	Health-based	Resolved	2000-05-01 → 2000-05-31
MCL	Health-based	Resolved	1998-07-01 → 1998-07-31
MCL	Health-based	Resolved	1998-07-01 → 1998-07-31
TT	Health-based	Resolved	1992-04-01 → 1993-08-10

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	16000 µg/L 160% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 38420 µg/L	1270/2036	SYR4	2012–2019
Chromium	18 µg/L 18% of the EPA limit 100 µg/L worst single sample: 25 µg/L	249/902	SYR4	2013–2019
Chloroform	57.9625 µg/L No EPA limit set worst single sample: 67.81 µg/L	232/232	SYR4	2012–2019
TTHM	59.7625 µg/L 75% of the EPA limit 80 µg/L worst single sample: 68.84 µg/L	232/232	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	54.725 µg/L 91% of the EPA limit 60 µg/L worst single sample: 63.8 µg/L	226/232	SYR4	2012–2019
Trichloroacetic Acid	24.735 µg/L No EPA limit set worst single sample: 30.2 µg/L	222/232	SYR4	2012–2019
Dichloroacetic Acid	32.08 µg/L No EPA limit set worst single sample: 42.6 µg/L	209/232	SYR4	2012–2019
Bromodichloromethane	4.4075 µg/L No EPA limit set worst single sample: 6.21 µg/L	202/232	SYR4	2012–2019
Dibromochloromethane	3 µg/L No EPA limit set worst single sample: 3.52 µg/L	93/232	SYR4	2012–2019
Bromoform	2.83 µg/L No EPA limit set worst single sample: 3.15 µg/L	41/232	SYR4	2012–2019
Dibromoacetic Acid	2.11 µg/L No EPA limit set worst single sample: 2.9 µg/L	30/232	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	29/29	LCR	2025
Fluoride	168 µg/L 4.2% of the EPA limit 4000 µg/L worst single sample: 240 µg/L	19/55	SYR4	2012–2019
Monochloroacetic Acid	4 µg/L No EPA limit set	13/232	SYR4	2012–2019
Monobromoacetic Acid	1 µg/L No EPA limit set	3/232	SYR4	2012–2019
Arsenic	2.95 µg/L 30% of the EPA limit 10 µg/L worst single sample: 3 µg/L	2/17	SYR4	2013–2019
Lithium	13 µg/L No EPA limit set	2/20	UCMR-5	2023
Diquat	2.2 µg/L 11% of the EPA limit 20 µg/L	1/30	SYR4	2013–2019
Gross Beta Particle Activity	1.27 pCi/L No EPA limit set	1/1	SYR4	2019

92 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-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: COSGROVE, JOSHUA
Phone: 650-991-8206
Email: [email protected]

Frequently asked questions about City of Daly City

Is City of Daly City tap water safe to drink?

EPA monitoring detected 19 contaminants in City of Daly City'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 Daly City's water?

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

How many people does City of Daly City serve?

City of Daly City reports serving 104,901 people in California, per its EPA record.

Has City of Daly City had any water quality violations?

The EPA has 7 violations on file for City of Daly City, of which 7 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.