Is Portola Improvement Association Mwc Tap Water Safe? Quality Report

Water source: Ground water under surface influence
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
MCL	Health-based	Archived	1980-06-01 → 1982-05-31
MR	Monitoring	Resolved	2024-03-01 → 2024-03-31
MR	Monitoring	Resolved	2024-03-01 → 2024-03-31
MR	Monitoring	Resolved	2010-06-01 → 2010-06-30
MR	Monitoring	Resolved	2010-06-01 → 2010-06-30
MR	Monitoring	Resolved	2005-01-01 → 2005-12-31
MR	Monitoring	Resolved	2005-01-01 → 2005-12-31
MR	Monitoring	Resolved	2005-01-01 → 2005-12-31
MR	Monitoring	Resolved	2005-01-01 → 2005-12-31
MR	Monitoring	Resolved	2005-01-01 → 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 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
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	29/29	LCR	2025
Bromodichloromethane	23.286 µg/L No EPA limit set worst single sample: 23.7 µg/L	5/5	SYR4	2013–2019
Chloroform	31.682 µg/L No EPA limit set worst single sample: 34.28 µg/L	5/5	SYR4	2013–2019
Dibromochloromethane	16.554 µg/L No EPA limit set worst single sample: 16.86 µg/L	5/5	SYR4	2013–2019
Dichloroacetic Acid	19.12 µg/L No EPA limit set worst single sample: 20.7 µg/L	5/5	SYR4	2013–2019
TTHM	73.166 µg/L 91% of the EPA limit 80 µg/L worst single sample: 76.4 µg/L	5/5	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	41.32 µg/L 69% of the EPA limit 60 µg/L worst single sample: 44.8 µg/L	5/5	SYR4	2013–2019
Trichloroacetic Acid	18.26 µg/L No EPA limit set worst single sample: 19.7 µg/L	5/5	SYR4	2013–2019
Barium	180 µg/L 9% of the EPA limit 2000 µg/L	4/4	SYR4	2012–2019
Bromoform	2.6685 µg/L No EPA limit set worst single sample: 2.7 µg/L	4/5	SYR4	2013–2019
Dibromoacetic Acid	4.57 µg/L No EPA limit set worst single sample: 4.6 µg/L	4/5	SYR4	2013–2019
Fluoride	247 µg/L 6.2% of the EPA limit 4000 µg/L worst single sample: 250 µg/L	4/4	SYR4	2012–2019
Cadmium	1.095 µg/L 22% of the EPA limit 5 µg/L worst single sample: 1.1 µg/L	2/4	SYR4	2012–2019
Monobromoacetic Acid	1 µg/L No EPA limit set	1/5	SYR4	2013–2019

65 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-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonochloroacetic AcidNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: FITZGERALD, YVETTE
Phone: 650-947-9687
Email: yvette@piamwco.org

Frequently asked questions about Portola Improvement Association Mwc

Is Portola Improvement Association Mwc tap water safe to drink?

EPA monitoring detected 14 contaminants in Portola Improvement Association Mwc'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 Portola Improvement Association Mwc's water?

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

How many people does Portola Improvement Association Mwc serve?

Portola Improvement Association Mwc reports serving 90 people in California, per its EPA record.

Has Portola Improvement Association Mwc had any water quality violations?

The EPA has 53 violations on file for Portola Improvement Association Mwc, of which 1 is 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.