Is Highlands Mutual Water Company Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Private
Counties served: Lake

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	Resolved	2021-04-01 → 2021-06-30
MCL	Health-based	Resolved	2021-04-01 → 2021-06-30
MCL	Health-based	Resolved	2021-01-01 → 2021-03-31
MCL	Health-based	Resolved	2021-01-01 → 2021-03-31
MCL	Health-based	Resolved	2019-04-01 → 2019-06-30
MCL	Health-based	Resolved	2019-04-01 → 2019-06-30
MCL	Health-based	Resolved	2019-01-01 → 2019-03-31
MCL	Health-based	Resolved	2019-01-01 → 2019-03-31
MCL	Health-based	Resolved	2015-10-01 → 2015-12-31
MCL	Health-based	Resolved	2015-10-01 → 2015-12-31

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
Chloroform	70.409 µg/L No EPA limit set worst single sample: 94.23 µg/L	70/70	SYR4	2012–2019
TTHM	87.423 µg/L 109% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 116.55 µg/L	70/70	SYR4	2012–2019
Dichloroacetic Acid	43.9 µg/L No EPA limit set worst single sample: 52.6 µg/L	69/69	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	68.36 µg/L 114% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 76.9 µg/L	69/69	SYR4	2012–2019
Trichloroacetic Acid	17.26 µg/L No EPA limit set worst single sample: 21 µg/L	69/69	SYR4	2012–2019
Bromodichloromethane	17.96 µg/L No EPA limit set worst single sample: 18.3 µg/L	57/70	SYR4	2012–2019
Dibromochloromethane	4.6475 µg/L No EPA limit set worst single sample: 6.07 µg/L	50/70	SYR4	2012–2019
Dibromoacetic Acid	2.34 µg/L No EPA limit set worst single sample: 3 µg/L	33/69	SYR4	2012–2019
Monochloroacetic Acid	8.05 µg/L No EPA limit set worst single sample: 10.3 µg/L	19/69	SYR4	2012–2019
Lead	0.0046 mg/L 31% of the EPA limit 0.0150 mg/L	16/16	LCR	2023
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L	10/15	SYR4	2012–2019
Arsenic	2.57 µg/L 26% of the EPA limit 10 µg/L worst single sample: 2.6 µg/L	4/15	SYR4	2012–2019
Lithium	25 µg/L No EPA limit set	4/4	UCMR-5	2024
Barium	110 µg/L 5.5% of the EPA limit 2000 µg/L	2/15	SYR4	2012–2019
Bromate	10.79 µg/L 108% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 11 µg/L	2/74	SYR4	2012–2019
Bromoform	1.7775 µg/L No EPA limit set worst single sample: 1.78 µg/L	2/70	SYR4	2012–2019
Monobromoacetic Acid	1.3 µg/L No EPA limit set	1/69	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-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: SISCO, RICHARD
Phone: 707-994-8676
Email: [email protected]

Frequently asked questions about Highlands Mutual Water Company

Is Highlands Mutual Water Company tap water safe to drink?

EPA monitoring detected 17 contaminants in Highlands Mutual Water Company'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 Highlands Mutual Water Company's water?

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

How many people does Highlands Mutual Water Company serve?

Highlands Mutual Water Company reports serving 7,772 people in California, per its EPA record.

Has Highlands Mutual Water Company had any water quality violations?

The EPA has 13 violations on file for Highlands Mutual Water Company, of which 10 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.