Is Stoughton 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
MON	Monitoring	Resolved	2020-10-01 → 2020-10-31
MON	Monitoring	Resolved	2020-10-01 → 2020-10-31
MON	Monitoring	Resolved	2020-10-01 → 2020-10-31
MON	Monitoring	Resolved	2020-10-01 → 2020-10-31
MR	Monitoring	Resolved	1994-04-01 → 1994-04-30
MR	Monitoring	Resolved	1994-04-01 → 1994-04-30
MR	Monitoring	Resolved	1994-04-01 → 1994-04-30
MR	Monitoring	Resolved	1994-04-01 → 1994-04-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFHXS	0.0036 µg/L	2/8	2025

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
Copper	174 µg/L 13% of the EPA limit 1300 µg/L worst single sample: 450 µg/L	273/278	SYR4	2014–2019
Lead	21.45 µg/L 143% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 77 µg/L	272/278	SYR4	2014–2019
Fluoride	1140 µg/L 28% of the EPA limit 4000 µg/L worst single sample: 2700 µg/L	102/200	SYR4	2012–2019
Nitrate	5910 µg/L 59% of the EPA limit 10000 µg/L worst single sample: 6300 µg/L	34/70	SYR4	2012–2019
Lead	0.0042 mg/L 28% of the EPA limit 0.0150 mg/L	21/21	LCR	2023
TTHM	13.0295 µg/L 16% of the EPA limit 80 µg/L worst single sample: 20.96 µg/L	18/18	SYR4	2012–2019
Chloroform	10.95 µg/L No EPA limit set worst single sample: 18 µg/L	16/45	SYR4	2012–2019
Bromodichloromethane	2.18 µg/L No EPA limit set worst single sample: 2.3 µg/L	13/45	SYR4	2012–2019
Dibromochloromethane	1.98 µg/L No EPA limit set worst single sample: 2.2 µg/L	12/45	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	2.3745 µg/L 4% of the EPA limit 60 µg/L worst single sample: 2.49 µg/L	12/16	SYR4	2012–2019
Dichloroacetic Acid	1.396 µg/L No EPA limit set worst single sample: 1.7 µg/L	9/16	SYR4	2012–2019
Barium	38.9 µg/L 1.9% of the EPA limit 2000 µg/L worst single sample: 41 µg/L	8/8	SYR4	2014–2017
Bromoform	1.24 µg/L No EPA limit set worst single sample: 1.3 µg/L	7/45	SYR4	2012–2019
Dibromoacetic Acid	1.28 µg/L No EPA limit set worst single sample: 1.4 µg/L	7/16	SYR4	2012–2019
Combined Radium (-226 And -228)	4.5925 pCi/L 92% of the EPA limit 5 pCi/L worst single sample: 4.64 pCi/L	6/6	SYR4	2014–2017
Gross Alpha, Excl. Radon And U	8.422 pCi/L 56% of the EPA limit 15 pCi/L worst single sample: 9.66 pCi/L	5/5	SYR4	2014–2017
Nitrate-Nitrite	4970 µg/L 50% of the EPA limit 10000 µg/L worst single sample: 5000 µg/L	3/8	SYR4	2014–2017
Thallium, Total	0.2480 µg/L 12% of the EPA limit 2 µg/L worst single sample: 0.2500 µg/L	3/8	SYR4	2014–2017
Chromium	0.8700 µg/L 0.9% of the EPA limit 100 µg/L	1/8	SYR4	2014–2017
Monobromoacetic Acid	0.4200 µg/L No EPA limit set	1/16	SYR4	2012–2019

83 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, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Stoughton Waterworks

Is Stoughton Waterworks tap water safe to drink?

EPA monitoring detected 21 contaminants in Stoughton 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 Stoughton Waterworks's water?

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

How many people does Stoughton Waterworks serve?

Stoughton Waterworks reports serving 13,078 people in Wisconsin, per its EPA record.

Has Stoughton Waterworks had any water quality violations?

The EPA has 8 violations on file for Stoughton Waterworks, of which 0 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.