Is Marshall Waterworks Tap Water Safe? Quality Report

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

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	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2017-10-01 → 2017-12-31
MCL	Health-based	Resolved	2015-01-01 → 2015-03-31
MCL	Health-based	Resolved	2015-01-01 → 2015-03-31
MCL	Health-based	Resolved	2015-01-01 → 2015-03-31
MCL	Health-based	Resolved	2015-01-01 → 2015-03-31

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
Fluoride	1210 µg/L 30% of the EPA limit 4000 µg/L worst single sample: 1280 µg/L	101/198	SYR4	2012–2019
Combined Radium (-226 And -228)	6.62 pCi/L 132% of the EPA limit, at the 95th percentile of samples — 5 pCi/L worst single sample: 9.18 pCi/L	49/49	SYR4	2012–2019
Copper	720.5 µg/L 55% of the EPA limit 1300 µg/L worst single sample: 780 µg/L	40/40	SYR4	2014–2017
Lead	2.39 µg/L 16% of the EPA limit 15 µg/L worst single sample: 4.1 µg/L	20/40	SYR4	2014–2017
Lead	0.00033 mg/L 2.2% of the EPA limit 0.0150 mg/L	14/14	LCR	2023
Gross Alpha, Excl. Radon And U	13.48 pCi/L 90% of the EPA limit 15 pCi/L worst single sample: 13.9 pCi/L	13/13	SYR4	2012–2019
TTHM	3.392 µg/L 4.2% of the EPA limit 80 µg/L worst single sample: 3.46 µg/L	9/9	SYR4	2013–2019
Chloroform	2.765 µg/L No EPA limit set worst single sample: 2.8 µg/L	8/21	SYR4	2012–2019
Gross Beta Particle Activity	7.0885 pCi/L No EPA limit set worst single sample: 7.68 pCi/L	8/8	SYR4	2012–2014
Barium	106.975 µg/L 5.3% of the EPA limit 2000 µg/L worst single sample: 114 µg/L	6/6	SYR4	2014–2017
Nitrate	240 µg/L 2.4% of the EPA limit 10000 µg/L	6/30	SYR4	2014–2019
Total Haloacetic Acids (HAA5)	1.0034 µg/L 1.7% of the EPA limit 60 µg/L worst single sample: 1.03 µg/L	5/9	SYR4	2013–2019
Bromodichloromethane	0.8220 µg/L No EPA limit set worst single sample: 0.8400 µg/L	3/21	SYR4	2012–2019
Dichloroacetic Acid	0.6180 µg/L No EPA limit set worst single sample: 0.6200 µg/L	3/9	SYR4	2013–2019
Combined Uranium	1.48 µg/L 4.9% of the EPA limit 30 µg/L worst single sample: 1.5 µg/L	2/2	SYR4	2017
Arsenic	1.16 µg/L 12% of the EPA limit 10 µg/L	1/6	SYR4	2014–2017
Dibromochloromethane	0.5100 µg/L No EPA limit set	1/21	SYR4	2012–2019
Nitrate-Nitrite	130 µg/L 1.3% of the EPA limit 10000 µg/L	1/12	SYR4	2012–2017
Trichloroacetic Acid	0.3600 µg/L No EPA limit set	1/9	SYR4	2013–2019

87 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromoacetic AcidDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Marshall Waterworks

Is Marshall Waterworks tap water safe to drink?

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

EPA monitoring detected Fluoride, Combined Radium (-226 And -228), Copper, Lead, Lead, and others. The full list with the level and data source for each is above.

How many people does Marshall Waterworks serve?

Marshall Waterworks reports serving 3,862 people in Wisconsin, per its EPA record.

Has Marshall Waterworks had any water quality violations?

The EPA has 39 violations on file for Marshall Waterworks, of which 22 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.