Is Madera Co md1-hidden Lake Estates Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Madera

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

115

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2026-01-01 → 2026-03-31
MCL	Health-based	Archived	2026-01-01 → 2026-03-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
MCL	Health-based	Archived	2025-07-01 → 2025-09-30
MCL	Health-based	Archived	2025-04-01 → 2025-06-30
MCL	Health-based	Archived	2025-04-01 → 2025-06-30
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
MCL	Health-based	Archived	2025-01-01 → 2025-03-31

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	188 µg/L No EPA limit set worst single sample: 200 µg/L	23/23	SYR4	2013–2019
TTHM	197 µg/L 246% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 210 µg/L	23/23	SYR4	2013–2019
Bromodichloromethane	6.4 µg/L No EPA limit set worst single sample: 9.9 µg/L	21/23	SYR4	2013–2019
Dichloroacetic Acid	62 µg/L No EPA limit set worst single sample: 81 µg/L	21/21	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	180 µg/L 300% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 210 µg/L	21/21	SYR4	2013–2019
Trichloroacetic Acid	120 µg/L No EPA limit set worst single sample: 160 µg/L	21/21	SYR4	2013–2019
Monochloroacetic Acid	4.415 µg/L No EPA limit set worst single sample: 4.8 µg/L	12/21	SYR4	2013–2019
Arsenic	7.32 µg/L 73% of the EPA limit 10 µg/L worst single sample: 8.6 µg/L	9/10	SYR4	2013–2019
Lead	0.00080 mg/L 5.3% of the EPA limit 0.0150 mg/L	8/8	LCR	2025
Barium	20.8 µg/L 1% of the EPA limit 2000 µg/L worst single sample: 25 µg/L	7/9	SYR4	2013–2019
Nitrate	1333.4 µg/L 13% of the EPA limit 10000 µg/L	4/24	SYR4	2012–2019
Copper	38.33 µg/L 2.9% of the EPA limit 1300 µg/L worst single sample: 40 µg/L	2/9	SYR4	2013–2019
Chromium	1.19 µg/L 1.2% of the EPA limit 100 µg/L worst single sample: 1.2 µg/L	2/9	SYR4	2013–2019
Dibromochloromethane	0.6200 µg/L No EPA limit set	1/23	SYR4	2013–2019

52 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDibromoacetic AcidEthylene DibromideEndothallEndrinEthylbenzeneFluorideHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: TOLER, PHIL
Phone: 559-675-7811
Email: philip.toler@maderacounty.com

Frequently asked questions about Madera Co md1-hidden Lake Estates

Is Madera Co md1-hidden Lake Estates tap water safe to drink?

EPA monitoring detected 14 contaminants in Madera Co md1-hidden Lake Estates'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 Madera Co md1-hidden Lake Estates'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 Madera Co md1-hidden Lake Estates serve?

Madera Co md1-hidden Lake Estates reports serving 162 people in California, per its EPA record.

Has Madera Co md1-hidden Lake Estates had any water quality violations?

The EPA has 115 violations on file for Madera Co md1-hidden Lake Estates, of which 87 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.