Is California Water Service - Bear Gulch Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Private
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
TT	Health-based	Resolved	2015-03-01 → 2015-03-31
TT	Health-based	Resolved	2015-03-01 → 2015-03-31
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
Other	Monitoring	Resolved	2006-04-01 → 2006-06-30
Other	Monitoring	Resolved	2006-04-01 → 2006-06-30

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 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
Chloroform	58.28 µg/L No EPA limit set worst single sample: 101.1 µg/L	317/317	SYR4	2012–2019
TTHM	71.02 µg/L 89% of the EPA limit 80 µg/L worst single sample: 124.2 µg/L	317/317	SYR4	2012–2019
Bromodichloromethane	15.931 µg/L No EPA limit set worst single sample: 19.94 µg/L	302/317	SYR4	2012–2019
Dichloroacetic Acid	32 µg/L No EPA limit set worst single sample: 38 µg/L	298/298	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	54 µg/L 90% of the EPA limit 60 µg/L worst single sample: 69 µg/L	298/298	SYR4	2012–2019
Trichloroacetic Acid	23 µg/L No EPA limit set worst single sample: 33 µg/L	298/298	SYR4	2012–2019
Dibromochloromethane	4.61 µg/L No EPA limit set worst single sample: 9.75 µg/L	117/317	SYR4	2012–2019
Monochloroacetic Acid	3.2 µg/L No EPA limit set worst single sample: 5.3 µg/L	74/298	SYR4	2012–2019
Lead	0.0040 mg/L 27% of the EPA limit 0.0150 mg/L	42/42	LCR	2024
Fluoride	377.5 µg/L 9.4% of the EPA limit 4000 µg/L worst single sample: 610 µg/L	16/16	SYR4	2012–2019
Antimony, Total	0.2215 µg/L 3.7% of the EPA limit 6 µg/L worst single sample: 0.2410 µg/L	14/49	SYR4	2012–2019
Arsenic	1.73185 µg/L 17% of the EPA limit 10 µg/L worst single sample: 1.739 µg/L	14/54	SYR4	2012–2019
Copper	27.984 µg/L 2.2% of the EPA limit 1300 µg/L worst single sample: 32.051 µg/L	14/52	SYR4	2012–2019
Chromium	7.2165 µg/L 7.2% of the EPA limit 100 µg/L worst single sample: 14.347 µg/L	14/53	SYR4	2012–2019
Lead	0.4694 µg/L 3.1% of the EPA limit 15 µg/L worst single sample: 0.5780 µg/L	14/52	SYR4	2012–2019
Cadmium	0.0280 µg/L 0.6% of the EPA limit 5 µg/L worst single sample: 0.0380 µg/L	11/51	SYR4	2012–2019
Combined Uranium	1.03332 µg/L 3.4% of the EPA limit 30 µg/L worst single sample: 1.04747 µg/L	11/32	SYR4	2012–2019
Dibromoacetic Acid	6.2 µg/L No EPA limit set	9/298	SYR4	2012–2019
Selenium	3.8644 µg/L 7.7% of the EPA limit 50 µg/L worst single sample: 4.084 µg/L	9/45	SYR4	2012–2019
Bromoform	33.732 µg/L No EPA limit set worst single sample: 51.19 µg/L	8/317	SYR4	2012–2019
Barium	107 µg/L 5.4% of the EPA limit 2000 µg/L worst single sample: 110 µg/L	7/32	SYR4	2012–2019
Beryllium, Total	0.0118 µg/L 0.3% of the EPA limit 4 µg/L worst single sample: 0.0130 µg/L	5/44	SYR4	2012–2019
Mercury	0.0195 µg/L 1% of the EPA limit 2 µg/L worst single sample: 0.0210 µg/L	4/20	SYR4	2012–2019
Nitrate	91.756 µg/L 0.9% of the EPA limit 10000 µg/L	4/46	SYR4	2012–2019
Monobromoacetic Acid	1.3 µg/L No EPA limit set	1/298	SYR4	2012–2019

86 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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: JAMES, SOPHIE
Phone: 408-367-8593
Email: [email protected]

Frequently asked questions about California Water Service - Bear Gulch

Is California Water Service - Bear Gulch tap water safe to drink?

EPA monitoring detected 25 contaminants in California Water Service - Bear Gulch'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 - Bear Gulch's water?

EPA monitoring detected Chloroform, TTHM, Bromodichloromethane, Dichloroacetic Acid, 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 - Bear Gulch serve?

California Water Service - Bear Gulch reports serving 61,431 people in California, per its EPA record.

Has California Water Service - Bear Gulch had any water quality violations?

The EPA has 7 violations on file for California Water Service - Bear Gulch, of which 5 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.