Is Stoughton, WI Tap Water Safe? Quality & Contaminants

What was found in Stoughton's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	5910 µg/L 59% of the EPA limit 10000 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	2/2	SYR4
Nitrate-Nitrite	4970 µg/L 50% of the EPA limit 10000 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017	2/2	SYR4
Fluoride	1140 µg/L 28% of the EPA limit 4000 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	2/2	SYR4
Copper	174 µg/L 13% of the EPA limit 1300 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019 Highest in the city: 477.2 µg/L — BAY VIEW HEIGHTS INC · 450 people · 2018	2/2	SYR4
Barium	38.9 µg/L 1.9% of the EPA limit 2000 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017 Highest in the city: 46.575 µg/L — BAY VIEW HEIGHTS INC · 450 people · 2018	2/2	SYR4
Lead	21.45 µg/L 143% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	2/2	SYR4
TTHM	13.0295 µg/L 16% of the EPA limit 80 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Chloroform	10.95 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Gross Alpha, Excl. Radon And U	8.422 pCi/L 56% of the EPA limit 15 pCi/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017	2/2	SYR4
Combined Radium (-226 And -228)	4.5925 pCi/L 92% of the EPA limit 5 pCi/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017	2/2	SYR4
Total Haloacetic Acids (HAA5)	2.3745 µg/L 4% of the EPA limit 60 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Bromodichloromethane	2.18 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Dibromochloromethane	1.98 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Dichloroacetic Acid	1.396 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Dibromoacetic Acid	1.28 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Bromoform	1.24 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Chromium	0.8700 µg/L 0.9% of the EPA limit 100 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017	1/2	SYR4
Monobromoacetic Acid	0.4200 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2019	1/2	SYR4
Thallium, Total	0.2480 µg/L 12% of the EPA limit 2 µg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2017	1/2	SYR4
Lead	0.0042 mg/L 28% of the EPA limit 0.0150 mg/L Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2023	2/2	LCR
PFHXS	0.0036 µg/L No EPA limit set Main supplier: STOUGHTON WATERWORKS · 13,078 people · 2025	1/2	UCMR-5

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Stoughton

Supplier	Population served
STOUGHTON WATERWORKS	13,078
BAY VIEW HEIGHTS INC	450

Frequently asked questions about Stoughton tap water

Is Stoughton tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Stoughton. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Stoughton?

2 public water suppliers report drinking-water monitoring for Stoughton, Wisconsin to the EPA. Each is listed above with its population served.

What contaminants are in Stoughton's water?

The contaminants EPA monitoring detected in Stoughton include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.

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.