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Tap water quality report

Butano Canyon Mutual

EPA monitoring tested this supplier for 80 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
13
detected
150
people served
4
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.

4
health-based violations
45
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2014-10-01 → 2014-10-31
MCL Health-based Resolved 2014-10-01 → 2014-10-31
MR Monitoring Resolved 2022-01-01 → 2022-03-31
MR Monitoring Resolved 2022-01-01 → 2022-03-31
MR Monitoring Resolved 2022-01-01 → 2022-03-31
MR Monitoring Resolved 2022-01-01 → 2022-03-31
Other Monitoring Resolved 2021-10-01
Other Monitoring Resolved 2021-10-01

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 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
Bromodichloromethane
32.17 µg/L
No EPA limit set
 27/27 SYR4 2013–2019
Chloroform
99.01 µg/L
No EPA limit set
 27/27 SYR4 2013–2019
Dibromochloromethane
34.37 µg/L
No EPA limit set
 27/27 SYR4 2013–2019
TTHM
119.58 µg/L 149%
of the EPA limit, in the worst sample — 80 µg/L
 27/27 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
127.7 µg/L 213%
of the EPA limit, in the worst sample — 60 µg/L
 25/26 SYR4 2013–2019
Trichloroacetic Acid
42.2 µg/L
No EPA limit set
 24/26 SYR4 2013–2019
Dichloroacetic Acid
85.5 µg/L
No EPA limit set
 23/26 SYR4 2013–2019
Bromoform
10.98 µg/L
No EPA limit set
 22/27 SYR4 2013–2019
Dibromoacetic Acid
8.5 µg/L
No EPA limit set
 17/26 SYR4 2013–2019
Lead
0.0023 mg/L 15%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Fluoride
150 µg/L 3.8%
of the EPA limit 4000 µg/L
 7/8 SYR4 2012–2019
Monochloroacetic Acid
6.3 µg/L
No EPA limit set
 2/26 SYR4 2013–2019
Copper
66 µg/L 5.1%
of the EPA limit 1300 µg/L
 1/8 SYR4 2012–2019
67 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNitrateNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BOLLIER, JIM
Phone
650-678-1363
Email
manager@bcmwc.org

Frequently asked questions about Butano Canyon Mutual

Is Butano Canyon Mutual tap water safe to drink?

EPA monitoring detected 13 contaminants in Butano Canyon Mutual'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 Butano Canyon Mutual's water?

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

How many people does Butano Canyon Mutual serve?

Butano Canyon Mutual reports serving 150 people in California, per its EPA record.

Has Butano Canyon Mutual had any water quality violations?

The EPA has 45 violations on file for Butano Canyon Mutual, of which 4 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.