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Tap water quality report

Middleton, WI

EPA monitoring detected 24 contaminants across the 1 water supplier serving Middleton. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
23,868
people served
24
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Middleton'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
4800 µg/L 48%
of the EPA limit 10000 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Nitrate-Nitrite
4750 µg/L 48%
of the EPA limit 10000 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Fluoride
919.25 µg/L 23%
of the EPA limit 4000 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Copper
220 µg/L 17%
of the EPA limit 1300 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Barium
73.6 µg/L 3.7%
of the EPA limit 2000 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
TTHM
28.354 µg/L 35%
of the EPA limit 80 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Chloroform
23.65 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
18.357 µg/L 31%
of the EPA limit 60 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Xylenes, Total
18.29 µg/L 0.2%
of the EPA limit 10000 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Dichloroacetic Acid
13.06 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Lead
5.65 µg/L 38%
of the EPA limit 15 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Bromodichloromethane
5.47 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Gross Alpha, Excl. Radon And U
4.986 pCi/L 33%
of the EPA limit 15 pCi/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Combined Radium (-226 And -228)
4.6277 pCi/L 93%
of the EPA limit 5 pCi/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Trichloroacetic Acid
3.94 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.27 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Dibromochloromethane
3.22 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.9 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Ethylbenzene
1.746 µg/L 0.2%
of the EPA limit 700 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Chromium
1.66 µg/L 1.7%
of the EPA limit 100 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Bromoform
0.9755 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Monobromoacetic Acid
0.9400 µg/L
No EPA limit set
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2019
1/1 SYR4
Thallium, Total
0.2500 µg/L 13%
of the EPA limit 2 µg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2017
1/1 SYR4
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
Main supplier: MIDDLETON WATERWORKS · 23,868 people · 2023
1/1 LCR
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 Middleton

SupplierPopulation served
MIDDLETON WATERWORKS 23,868

Frequently asked questions about Middleton tap water

Is Middleton tap water safe to drink?

EPA testing detected 24 contaminants in the water serving Middleton. 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 Middleton?

1 public water supplier report drinking-water monitoring for Middleton, Wisconsin to the EPA. Each is listed above with its population served.

What contaminants are in Middleton's water?

The contaminants EPA monitoring detected in Middleton 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.