Tap WaterIndex

Tap water quality report

Waukesha Water Utility

EPA monitoring tested this supplier for 79 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
24
detected
70,718
people served
2,447
health-based violations
Water source
SWP
Ownership
Local government
Counties served
Waukesha

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.

2,447
health-based violations
2,526
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31
MCL Health-based Resolved 2023-10-01 → 2023-12-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Combined Radium (-226 And -228)
22 pCi/L 440%
of the EPA limit, in the worst sample — 5 pCi/L
 242/242 SYR4 2012–2019
Gross Beta Particle Activity
28.8 pCi/L
No EPA limit set
 240/240 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
48.2 pCi/L 321%
of the EPA limit, in the worst sample — 15 pCi/L
 239/239 SYR4 2012–2019
Combined Uranium
1.64 µg/L 5.5%
of the EPA limit 30 µg/L
 169/169 SYR4 2012–2019
Fluoride
970 µg/L 24%
of the EPA limit 4000 µg/L
 116/212 SYR4 2012–2019
Copper
320 µg/L 25%
of the EPA limit 1300 µg/L
 65/65 SYR4 2014–2017
Lead
8.1 µg/L 54%
of the EPA limit 15 µg/L
 60/65 SYR4 2014–2017
Bromodichloromethane
7.15 µg/L
No EPA limit set
 35/48 SYR4 2012–2019
Dibromochloromethane
6.2 µg/L
No EPA limit set
 33/48 SYR4 2012–2019
Chloroform
6.96 µg/L
No EPA limit set
 29/48 SYR4 2012–2019
TTHM
22.18 µg/L 28%
of the EPA limit 80 µg/L
 22/22 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
4.19 µg/L 7%
of the EPA limit 60 µg/L
 22/22 SYR4 2012–2019
Barium
180 µg/L 9%
of the EPA limit 2000 µg/L
 20/20 SYR4 2014–2017
Bromoform
1.9 µg/L
No EPA limit set
 20/48 SYR4 2012–2019
Dibromoacetic Acid
1.7 µg/L
No EPA limit set
 20/22 SYR4 2012–2019
Lead
0.00056 mg/L 3.7%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2024
Dichloroacetic Acid
2.6 µg/L
No EPA limit set
 8/22 SYR4 2012–2019
Trichloroacetic Acid
0.7500 µg/L
No EPA limit set
 7/22 SYR4 2012–2019
Nitrate
170 µg/L 1.7%
of the EPA limit 10000 µg/L
 6/94 SYR4 2012–2019
Monobromoacetic Acid
0.4900 µg/L
No EPA limit set
 4/22 SYR4 2012–2019
Arsenic
2.8 µg/L 28%
of the EPA limit 10 µg/L
 3/20 SYR4 2014–2017
Cyanide
40 µg/L 20%
of the EPA limit 200 µg/L
 3/4 SYR4 2015
Nitrate-Nitrite
100 µg/L 1%
of the EPA limit 10000 µg/L
 2/20 SYR4 2014–2017
Antimony, Total
0.4200 µg/L 7%
of the EPA limit 6 µg/L
 1/20 SYR4 2014–2017
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about Waukesha Water Utility

Is Waukesha Water Utility tap water safe to drink?

EPA monitoring detected 24 contaminants in Waukesha Water Utility'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 Waukesha Water Utility's water?

EPA monitoring detected Combined Radium (-226 And -228), Gross Beta Particle Activity, Gross Alpha, Excl. Radon And U, Combined Uranium, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Waukesha Water Utility serve?

Waukesha Water Utility reports serving 70,718 people, per its EPA record.

Has Waukesha Water Utility had any water quality violations?

The EPA has 2526 violations on file for Waukesha Water Utility, of which 2447 are health-based (a contaminant limit or required treatment was breached) and 2 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.