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Tap water quality report

Sauk City Waterworks

EPA monitoring tested this supplier for 106 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

106
contaminants tested
18
detected
3,518
people served
0
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Sauk

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.

0
health-based violations
9
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2024-07-01
Other Monitoring Resolved 2024-07-01
Other Monitoring Resolved 2024-07-01
Other Monitoring Resolved 2024-07-01
MR Monitoring Resolved 1993-12-01 → 1993-12-31
MR Monitoring Resolved 1993-12-01 → 1993-12-31
MR Monitoring Resolved 1993-12-01 → 1993-12-31
MR Monitoring Resolved 1993-12-01 → 1993-12-31
MR Monitoring Archived 1991-03-01 → 1991-03-31

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 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
1190 µg/L 30%
of the EPA limit 4000 µg/L
worst single sample: 1280 µg/L
98/196 SYR4 2012–2019
Copper
201 µg/L 15%
of the EPA limit 1300 µg/L
worst single sample: 219 µg/L
41/41 SYR4 2014–2017
Lead
5.4 µg/L 36%
of the EPA limit 15 µg/L
worst single sample: 6 µg/L
21/41 SYR4 2014–2017
Lead
0.0064 mg/L 43%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2023
Gross Alpha, Excl. Radon And U
14.7633 pCi/L 98%
of the EPA limit 15 pCi/L
worst single sample: 15.1867 pCi/L
11/11 SYR4 2012–2017
Combined Radium (-226 And -228)
3.7695 pCi/L 75%
of the EPA limit 5 pCi/L
worst single sample: 3.9 pCi/L
10/10 SYR4 2012–2017
TTHM
13.3365 µg/L 17%
of the EPA limit 80 µg/L
worst single sample: 13.53 µg/L
10/10 SYR4 2013–2019
Chloroform
10.475 µg/L
No EPA limit set
worst single sample: 11 µg/L
8/12 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
2.293 µg/L 3.8%
of the EPA limit 60 µg/L
worst single sample: 2.51 µg/L
8/10 SYR4 2013–2019
Bromodichloromethane
2.36 µg/L
No EPA limit set
worst single sample: 2.5 µg/L
5/12 SYR4 2013–2019
Dichloroacetic Acid
1.86 µg/L
No EPA limit set
worst single sample: 1.9 µg/L
5/10 SYR4 2013–2019
Barium
23.985 µg/L 1.2%
of the EPA limit 2000 µg/L
worst single sample: 24 µg/L
4/4 SYR4 2014–2017
Combined Uranium
1.14 µg/L 3.8%
of the EPA limit 30 µg/L
 4/4 SYR4 2013
Nitrate
140 µg/L 1.4%
of the EPA limit 10000 µg/L
 4/32 SYR4 2012–2019
Trichloroacetic Acid
0.9095 µg/L
No EPA limit set
worst single sample: 0.9200 µg/L
4/10 SYR4 2013–2019
Gross Beta Particle Activity
9.09 pCi/L
No EPA limit set
worst single sample: 9.2 pCi/L
3/3 SYR4 2013–2014
Dibromochloromethane
1.0815 µg/L
No EPA limit set
worst single sample: 1.1 µg/L
2/12 SYR4 2013–2019
Dibromoacetic Acid
0.1400 µg/L
No EPA limit set
 1/10 SYR4 2013–2019
88 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 EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Sauk City Waterworks

Is Sauk City Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Sauk City 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 Sauk City Waterworks's water?

EPA monitoring detected Fluoride, Copper, Lead, Lead, 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 Sauk City Waterworks serve?

Sauk City Waterworks reports serving 3,518 people in Wisconsin, per its EPA record.

Has Sauk City Waterworks had any water quality violations?

The EPA has 9 violations on file for Sauk City Waterworks, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 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.