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Tap water quality report

Oak Creek Waterworks

EPA monitoring tested this supplier for 104 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
19
detected
32,104
people served
22
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Surface water
Ownership
Local government
Counties served
Milwaukee

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.

22
health-based violations
143
violations on file
1
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-10-17
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-07-01 → 2018-09-30

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Fluoride
1030 µg/L 26%
of the EPA limit 4000 µg/L
worst single sample: 1140 µg/L
104/200 SYR4 2012–2019
Bromodichloromethane
14 µg/L
No EPA limit set
worst single sample: 20 µg/L
60/60 SYR4 2012–2019
Copper
290 µg/L 22%
of the EPA limit 1300 µg/L
worst single sample: 310 µg/L
60/60 SYR4 2014–2017
Chloroform
44.15 µg/L
No EPA limit set
worst single sample: 370 µg/L
60/60 SYR4 2012–2019
Dibromochloromethane
8.415 µg/L
No EPA limit set
worst single sample: 10 µg/L
60/60 SYR4 2012–2019
Lead
3.5 µg/L 23%
of the EPA limit 15 µg/L
worst single sample: 31 µg/L
59/60 SYR4 2014–2017
TTHM
62.3225 µg/L 78%
of the EPA limit 80 µg/L
worst single sample: 400.6 µg/L
56/56 SYR4 2012–2019
Dibromoacetic Acid
2.73 µg/L
No EPA limit set
worst single sample: 3 µg/L
55/55 SYR4 2012–2019
Dichloroacetic Acid
16.3 µg/L
No EPA limit set
worst single sample: 22 µg/L
55/55 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
26.49 µg/L 44%
of the EPA limit 60 µg/L
worst single sample: 31.83 µg/L
55/55 SYR4 2012–2019
Trichloroacetic Acid
5.6 µg/L
No EPA limit set
worst single sample: 7.3 µg/L
55/55 SYR4 2012–2019
Bromoform
2.3 µg/L
No EPA limit set
 40/60 SYR4 2012–2019
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
27/55 SYR4 2012–2019
Nitrate-Nitrite
630 µg/L 6.3%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2023
Barium
21 µg/L 1.1%
of the EPA limit 2000 µg/L
 8/8 SYR4 2012–2019
Monochloroacetic Acid
2.8 µg/L
No EPA limit set
 7/55 SYR4 2012–2019
Arsenic
1.49 µg/L 15%
of the EPA limit 10 µg/L
worst single sample: 1.5 µg/L
2/8 SYR4 2012–2019
Combined Radium (-226 And -228)
0.6500 pCi/L 13%
of the EPA limit 5 pCi/L
 1/1 SYR4 2014
85 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, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Oak Creek Waterworks

Is Oak Creek Waterworks tap water safe to drink?

EPA monitoring detected 19 contaminants in Oak Creek 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 Oak Creek Waterworks's water?

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

How many people does Oak Creek Waterworks serve?

Oak Creek Waterworks reports serving 32,104 people in Wisconsin, per its EPA record.

Has Oak Creek Waterworks had any water quality violations?

The EPA has 143 violations on file for Oak Creek Waterworks, of which 22 are health-based (a contaminant limit or required treatment was breached) and 1 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.