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Tap water quality report

Loma Mar Mutual

EPA monitoring tested this supplier for 79 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
17
detected
65
people served
24
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.

24
health-based violations
60
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2016-08-01 → 2016-08-31
TT Health-based Resolved 2016-08-01 → 2016-08-31
MCL Health-based Resolved 2016-04-01 → 2016-06-30
MCL Health-based Resolved 2016-04-01 → 2016-06-30
TT Health-based Resolved 2014-09-01 → 2014-09-30
TT Health-based Resolved 2014-09-01 → 2014-09-30
TT Health-based Resolved 2013-03-01 → 2013-03-31
TT Health-based Resolved 2013-03-01 → 2013-03-31
TT Health-based Resolved 2013-03-01 → 2013-03-31
TT Health-based Resolved 2005-12-01 → 2005-12-31

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
Dibromochloromethane
96 µg/L
No EPA limit set
 28/28 SYR4 2012–2019
TTHM
291 µg/L 364%
of the EPA limit, in the worst sample — 80 µg/L
 27/27 SYR4 2012–2019
Bromodichloromethane
89 µg/L
No EPA limit set
 26/28 SYR4 2012–2019
Chloroform
93 µg/L
No EPA limit set
 25/28 SYR4 2012–2019
Bromoform
91.4 µg/L
No EPA limit set
 23/28 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
95.8 µg/L 160%
of the EPA limit, in the worst sample — 60 µg/L
 19/20 SYR4 2012–2019
Dibromoacetic Acid
24.4 µg/L
No EPA limit set
 18/20 SYR4 2012–2019
Dichloroacetic Acid
36.8 µg/L
No EPA limit set
 17/20 SYR4 2012–2019
Trichloroacetic Acid
53.3 µg/L
No EPA limit set
 17/20 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2025
Fluoride
270 µg/L 6.8%
of the EPA limit 4000 µg/L
 4/4 SYR4 2015–2019
Nitrate
178.54 µg/L 1.8%
of the EPA limit 10000 µg/L
 4/16 SYR4 2012–2019
Arsenic
2.1 µg/L 21%
of the EPA limit 10 µg/L
 1/5 SYR4 2015–2019
Barium
40 µg/L 2%
of the EPA limit 2000 µg/L
 1/5 SYR4 2015–2019
Copper
3 µg/L 0.2%
of the EPA limit 1300 µg/L
 1/6 SYR4 2012–2019
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
 1/20 SYR4 2012–2019
Monochloroacetic Acid
2.9 µg/L
No EPA limit set
 1/20 SYR4 2012–2019
62 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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HARTMAN-CARR, WENDY
Phone
650-879-9638
Email
whartmancarr@yahoo.com

Frequently asked questions about Loma Mar Mutual

Is Loma Mar Mutual tap water safe to drink?

EPA monitoring detected 17 contaminants in Loma Mar 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 Loma Mar Mutual's water?

EPA monitoring detected Dibromochloromethane, TTHM, Bromodichloromethane, Chloroform, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Loma Mar Mutual serve?

Loma Mar Mutual reports serving 65 people in California, per its EPA record.

Has Loma Mar Mutual had any water quality violations?

The EPA has 60 violations on file for Loma Mar Mutual, of which 24 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.