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Lake Mills Waterworks

EPA monitoring tested this supplier for 105 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
18
detected
6,211
people served
33
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Jefferson

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.

33
health-based violations
150
violations on file
5
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2022-09-17
TT Health-based Resolved 2022-09-17
TT Health-based Resolved 2022-09-17
TT Health-based Resolved 2022-09-17
TT Health-based Resolved 2017-10-01
TT Health-based Resolved 2017-10-01
TT Health-based Resolved 2017-10-01
TT Health-based Resolved 2017-10-01
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30

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
Copper
1500 µg/L 115%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
worst single sample: 15000 µg/L
514/518 SYR4 2012–2019
Lead
118 µg/L 787%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 1200 µg/L
485/517 SYR4 2012–2019
Fluoride
1240 µg/L 31%
of the EPA limit 4000 µg/L
worst single sample: 1270 µg/L
101/198 SYR4 2012–2019
Combined Radium (-226 And -228)
6.513 pCi/L 130%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
worst single sample: 6.53 pCi/L
35/35 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
10.8545 pCi/L 72%
of the EPA limit 15 pCi/L
worst single sample: 12.7 pCi/L
35/35 SYR4 2012–2019
Lead
0.0046 mg/L 31%
of the EPA limit 0.0150 mg/L
 30/30 LCR 2025
Combined Uranium
1.0502 µg/L 3.5%
of the EPA limit 30 µg/L
worst single sample: 1.16 µg/L
10/10 SYR4 2013–2019
Bromodichloromethane
2.7 µg/L
No EPA limit set
worst single sample: 2.9 µg/L
9/15 SYR4 2013–2019
Chloroform
5.44 µg/L
No EPA limit set
worst single sample: 5.8 µg/L
9/16 SYR4 2013–2019
TTHM
9.4 µg/L 12%
of the EPA limit 80 µg/L
worst single sample: 10 µg/L
9/9 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
4.892 µg/L 8.2%
of the EPA limit 60 µg/L
worst single sample: 4.92 µg/L
9/9 SYR4 2013–2019
Dibromoacetic Acid
0.6860 µg/L
No EPA limit set
worst single sample: 0.7700 µg/L
7/9 SYR4 2013–2019
Dibromochloromethane
1.27 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
7/16 SYR4 2013–2019
Trichloroacetic Acid
1.2 µg/L
No EPA limit set
 7/9 SYR4 2013–2019
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 6/6 SYR4 2014–2017
Dichloroacetic Acid
3 µg/L
No EPA limit set
worst single sample: 3.2 µg/L
6/9 SYR4 2013–2019
Monobromoacetic Acid
0.7315 µg/L
No EPA limit set
worst single sample: 0.7600 µg/L
2/9 SYR4 2013–2019
Xylenes, Total
2.8 µg/L 0%
of the EPA limit 10000 µg/L
 1/14 SYR4 2012–2019
87 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, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Lake Mills Waterworks

Is Lake Mills Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Lake Mills 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 Lake Mills Waterworks's water?

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

How many people does Lake Mills Waterworks serve?

Lake Mills Waterworks reports serving 6,211 people in Wisconsin, per its EPA record.

Has Lake Mills Waterworks had any water quality violations?

The EPA has 150 violations on file for Lake Mills Waterworks, of which 33 are health-based (a contaminant limit or required treatment was breached) and 5 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.