Is Madera Co sa16 Sumner Hill 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

112

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	2025-07-01 → 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	2025-04-01 → 2025-06-30

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
Total Haloacetic Acids (HAA5)	204 µg/L 340% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 270 µg/L	27/28	SYR4	2013–2019
Chloroform	180 µg/L No EPA limit set worst single sample: 220 µg/L	26/26	SYR4	2014–2019
TTHM	180 µg/L 225% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 230 µg/L	26/26	SYR4	2014–2019
Trichloroacetic Acid	135 µg/L No EPA limit set worst single sample: 170 µg/L	26/28	SYR4	2013–2019
Dichloroacetic Acid	70.25 µg/L No EPA limit set worst single sample: 96 µg/L	24/26	SYR4	2013–2019
Bromodichloromethane	6.38 µg/L No EPA limit set worst single sample: 7.2 µg/L	23/26	SYR4	2014–2019
Monochloroacetic Acid	5.83 µg/L No EPA limit set worst single sample: 6 µg/L	18/26	SYR4	2013–2019
Lead	0.0031 mg/L 21% of the EPA limit 0.0150 mg/L	11/11	LCR	2025
Arsenic	10.555 µg/L 106% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 16 µg/L	10/13	SYR4	2013–2019
Barium	19.1 µg/L 1% of the EPA limit 2000 µg/L worst single sample: 20 µg/L	7/10	SYR4	2013–2019
Copper	64.2 µg/L 4.9% of the EPA limit 1300 µg/L worst single sample: 68 µg/L	5/10	SYR4	2013–2019
Lead	9.635 µg/L 64% of the EPA limit 15 µg/L worst single sample: 11 µg/L	4/8	SYR4	2013–2019
Monobromoacetic Acid	1.57 µg/L No EPA limit set worst single sample: 1.6 µg/L	4/26	SYR4	2013–2019
Nitrate	3390 µg/L 34% of the EPA limit 10000 µg/L	4/34	SYR4	2012–2019
Chromium	2.35 µg/L 2.4% of the EPA limit 100 µg/L worst single sample: 2.4 µg/L	2/10	SYR4	2013–2019
Dibromoacetic Acid	3.3 µg/L No EPA limit set worst single sample: 3.4 µg/L	2/26	SYR4	2013–2019
Fluoride	120 µg/L 3% of the EPA limit 4000 µg/L	1/10	SYR4	2013–2019

40 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBenzeneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideCombined Radium (-226 And -228)Combined UraniumDichloromethaneDibromochloromethaneEthylene DibromideEndothallEthylbenzeneLassoMercuryNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl 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 sa16 Sumner Hill

Is Madera Co sa16 Sumner Hill tap water safe to drink?

EPA monitoring detected 17 contaminants in Madera Co sa16 Sumner Hill'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 sa16 Sumner Hill's water?

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

How many people does Madera Co sa16 Sumner Hill serve?

Madera Co sa16 Sumner Hill reports serving 135 people in California, per its EPA record.

Has Madera Co sa16 Sumner Hill had any water quality violations?

The EPA has 112 violations on file for Madera Co sa16 Sumner Hill, of which 99 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.