Tap WaterIndex

← Wisconsin

Tap water quality report

Waukesha, WI

EPA monitoring detected 24 contaminants across the 2 water suppliers serving Waukesha. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
70,798
people served
24
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Waukesha's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
9230 µg/L 92%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
8570 µg/L 86%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
970 µg/L 24%
of the EPA limit 4000 µg/L
 2/2 SYR4
Copper
558.2 µg/L 43%
of the EPA limit 1300 µg/L
 2/2 SYR4
Barium
180 µg/L 9%
of the EPA limit 2000 µg/L
 2/2 SYR4
Lead
52.63 µg/L 351%
of the EPA limit, in the worst sample — 15 µg/L
 2/2 SYR4
Gross Alpha, Excl. Radon And U
48.2 pCi/L 321%
of the EPA limit, in the worst sample — 15 pCi/L
 2/2 SYR4
Cyanide
40 µg/L 20%
of the EPA limit 200 µg/L
 1/2 SYR4
Gross Beta Particle Activity
28.8 pCi/L
No EPA limit set
 2/2 SYR4
TTHM
22.18 µg/L 28%
of the EPA limit 80 µg/L
 1/2 SYR4
Combined Radium (-226 And -228)
22 pCi/L 440%
of the EPA limit, in the worst sample — 5 pCi/L
 2/2 SYR4
Bromodichloromethane
7.15 µg/L
No EPA limit set
 1/2 SYR4
Chloroform
6.96 µg/L
No EPA limit set
 1/2 SYR4
Dibromochloromethane
6.2 µg/L
No EPA limit set
 1/2 SYR4
Total Haloacetic Acids (HAA5)
4.19 µg/L 7%
of the EPA limit 60 µg/L
 1/2 SYR4
Arsenic
2.8 µg/L 28%
of the EPA limit 10 µg/L
 1/2 SYR4
Dichloroacetic Acid
2.6 µg/L
No EPA limit set
 1/2 SYR4
Bromoform
1.9 µg/L
No EPA limit set
 1/2 SYR4
Dibromoacetic Acid
1.7 µg/L
No EPA limit set
 1/2 SYR4
Combined Uranium
1.64 µg/L 5.5%
of the EPA limit 30 µg/L
 1/2 SYR4
Trichloroacetic Acid
0.7500 µg/L
No EPA limit set
 1/2 SYR4
Monobromoacetic Acid
0.4900 µg/L
No EPA limit set
 1/2 SYR4
Antimony, Total
0.4200 µg/L 7%
of the EPA limit 6 µg/L
 1/2 SYR4
Lead
0.0013 mg/L 8.7%
of the EPA limit 0.0150 mg/L
 2/2 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 single worst sample on record — 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 Waukesha

SupplierPopulation served
WAUKESHA WATER UTILITY 70,718
SCHOENSTATT SISTERS OF MARY 80

Frequently asked questions about Waukesha tap water

Is Waukesha tap water safe to drink?

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

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

What contaminants are in Waukesha's water?

The contaminants EPA monitoring detected in Waukesha include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. The full list, with the highest level found 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.