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Tap water quality report

California Water Service - Bear Gulch

EPA monitoring tested this supplier for 111 contaminants and detected 25. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
25
detected
61,431
people served
5
health-based violations
California rankingsLead in CaliforniaPFAS in California
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.

5
health-based violations
7
violations on file
0
still open
ViolationTypeStatusPeriod
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 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
Chloroform
101.1 µg/L
No EPA limit set
 317/317 SYR4 2012–2019
TTHM
124.2 µg/L 155%
of the EPA limit, in the worst sample — 80 µg/L
 317/317 SYR4 2012–2019
Bromodichloromethane
19.94 µg/L
No EPA limit set
 302/317 SYR4 2012–2019
Dichloroacetic Acid
38 µg/L
No EPA limit set
 298/298 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
69 µg/L 115%
of the EPA limit, in the worst sample — 60 µg/L
 298/298 SYR4 2012–2019
Trichloroacetic Acid
33 µg/L
No EPA limit set
 298/298 SYR4 2012–2019
Dibromochloromethane
9.75 µg/L
No EPA limit set
 117/317 SYR4 2012–2019
Monochloroacetic Acid
5.3 µg/L
No EPA limit set
 74/298 SYR4 2012–2019
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
 42/42 LCR 2024
Fluoride
610 µg/L 15%
of the EPA limit 4000 µg/L
 16/16 SYR4 2012–2019
Antimony, Total
0.2410 µg/L 4%
of the EPA limit 6 µg/L
 14/49 SYR4 2012–2019
Arsenic
1.739 µg/L 17%
of the EPA limit 10 µg/L
 14/54 SYR4 2012–2019
Copper
32.051 µg/L 2.5%
of the EPA limit 1300 µg/L
 14/52 SYR4 2012–2019
Chromium
14.347 µg/L 14%
of the EPA limit 100 µg/L
 14/53 SYR4 2012–2019
Lead
0.5780 µg/L 3.9%
of the EPA limit 15 µg/L
 14/52 SYR4 2012–2019
Cadmium
0.0380 µg/L 0.8%
of the EPA limit 5 µg/L
 11/51 SYR4 2012–2019
Combined Uranium
1.04747 µg/L 3.5%
of the EPA limit 30 µg/L
 11/32 SYR4 2012–2019
Dibromoacetic Acid
6.2 µg/L
No EPA limit set
 9/298 SYR4 2012–2019
Selenium
4.084 µg/L 8.2%
of the EPA limit 50 µg/L
 9/45 SYR4 2012–2019
Bromoform
51.19 µg/L
No EPA limit set
 8/317 SYR4 2012–2019
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
 7/32 SYR4 2012–2019
Beryllium, Total
0.0130 µg/L 0.3%
of the EPA limit 4 µg/L
 5/44 SYR4 2012–2019
Mercury
0.0210 µg/L 1.1%
of the EPA limit 2 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
sjames@calwater.com

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.