Is Mauston Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Juneau

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
TT	Health-based	Resolved	2024-10-17
MCL	Health-based	Resolved	1993-08-01 → 1993-08-31
MCL	Health-based	Resolved	1993-08-01 → 1993-08-31
MCL	Health-based	Resolved	1993-08-01 → 1993-08-31
MCL	Health-based	Resolved	1993-08-01 → 1993-08-31
Other	Monitoring	Unaddressed	2024-10-17
MR	Monitoring	Resolved	2021-02-01
MR	Monitoring	Resolved	2021-02-01
MR	Monitoring	Resolved	1993-01-01 → 1993-08-24
MR	Monitoring	Resolved	1993-01-01 → 1993-08-24

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
Fluoride	1169.5 µg/L 29% of the EPA limit 4000 µg/L worst single sample: 1220 µg/L	102/200	SYR4	2012–2019
Nitrate	3460 µg/L 35% of the EPA limit 10000 µg/L worst single sample: 3940 µg/L	48/48	SYR4	2012–2019
Copper	265.45 µg/L 20% of the EPA limit 1300 µg/L worst single sample: 422 µg/L	28/40	SYR4	2014–2017
Lead	0.00094 mg/L 6.3% of the EPA limit 0.0150 mg/L	21/21	LCR	2023
Lead	106.125 µg/L 708% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 280 µg/L	14/40	SYR4	2014–2017
Barium	34.35 µg/L 1.7% of the EPA limit 2000 µg/L worst single sample: 37.4 µg/L	6/6	SYR4	2014–2017
Monochloroacetic Acid	13.6175 µg/L No EPA limit set worst single sample: 16 µg/L	6/6	SYR4	2014–2019
Nitrate-Nitrite	2717.5 µg/L 27% of the EPA limit 10000 µg/L worst single sample: 3140 µg/L	6/6	SYR4	2014–2017
Total Haloacetic Acids (HAA5)	16.0308 µg/L 27% of the EPA limit 60 µg/L worst single sample: 19.105 µg/L	6/6	SYR4	2014–2019
Bromodichloromethane	2.738 µg/L No EPA limit set worst single sample: 2.95 µg/L	5/6	SYR4	2014–2019
Chloroform	1.574 µg/L No EPA limit set worst single sample: 1.62 µg/L	5/6	SYR4	2014–2019
TTHM	11.6424 µg/L 15% of the EPA limit 80 µg/L worst single sample: 12.868 µg/L	5/6	SYR4	2014–2019
Combined Radium (-226 And -228)	3.8025 pCi/L 76% of the EPA limit 5 pCi/L worst single sample: 4.17 pCi/L	4/4	SYR4	2014–2017
Dibromochloromethane	4.8665 µg/L No EPA limit set worst single sample: 5.33 µg/L	4/6	SYR4	2014–2019
Gross Alpha, Excl. Radon And U	5.935 pCi/L 40% of the EPA limit 15 pCi/L worst single sample: 6.1 pCi/L	4/4	SYR4	2014–2017
Bromoform	3.565 µg/L No EPA limit set worst single sample: 3.78 µg/L	3/6	SYR4	2014–2019
Combined Uranium	0.7200 µg/L 2.4% of the EPA limit 30 µg/L	1/1	SYR4	2017
Selenium	1 µg/L 2% of the EPA limit 50 µg/L	1/6	SYR4	2014–2017
Trichloroacetic Acid	2.44 µg/L No EPA limit set	1/6	SYR4	2014–2019

55 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromoacetic AcidDichloroacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Mauston Waterworks

Is Mauston Waterworks tap water safe to drink?

EPA monitoring detected 19 contaminants in Mauston Waterworks'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 Mauston Waterworks's water?

EPA monitoring detected Fluoride, Nitrate, Copper, Lead, Lead, and others. The full list with the level and data source for each is above.

How many people does Mauston Waterworks serve?

Mauston Waterworks reports serving 4,456 people in Wisconsin, per its EPA record.

Has Mauston Waterworks had any water quality violations?

The EPA has 13 violations on file for Mauston Waterworks, of which 5 are health-based (a contaminant limit or required treatment was breached) and 1 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.