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Superior Water Light & Power Company

EPA monitoring tested this supplier for 77 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

77
contaminants tested
16
detected
26,084
people served
5
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Surface water
Ownership
Private
Counties served
Douglas

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.

5
health-based violations
25
violations on file
1
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-10-17
MCL Health-based Resolved 2018-01-01 → 2018-03-31
MCL Health-based Resolved 2018-01-01 → 2018-03-31
MCL Health-based Resolved 2018-01-01 → 2018-03-31
TT Health-based Resolved 1996-01-01
Other Monitoring Unaddressed 2024-10-17
MR Monitoring Resolved 2014-10-01 → 2014-12-31
MR Monitoring Resolved 2014-10-01 → 2014-12-31
MR Monitoring Resolved 2014-10-01 → 2014-12-31
MR Monitoring Resolved 2014-10-01 → 2014-12-31

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 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
Chloroform
92.6 µg/L
No EPA limit set
worst single sample: 130 µg/L
123/123 SYR4 2012–2019
Bromodichloromethane
8.085 µg/L
No EPA limit set
worst single sample: 11 µg/L
122/123 SYR4 2012–2019
TTHM
106.371 µg/L 133%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 138.9 µg/L
107/107 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
44.4225 µg/L 74%
of the EPA limit 60 µg/L
worst single sample: 57 µg/L
106/107 SYR4 2012–2019
Fluoride
816.6 µg/L 20%
of the EPA limit 4000 µg/L
worst single sample: 903 µg/L
103/201 SYR4 2012–2019
Trichloroacetic Acid
24.2 µg/L
No EPA limit set
worst single sample: 40 µg/L
98/107 SYR4 2012–2019
Dichloroacetic Acid
20 µg/L
No EPA limit set
worst single sample: 27 µg/L
97/107 SYR4 2012–2019
Copper
80.15 µg/L 6.2%
of the EPA limit 1300 µg/L
worst single sample: 250 µg/L
60/60 SYR4 2014–2017
Lead
7.08 µg/L 47%
of the EPA limit 15 µg/L
worst single sample: 61 µg/L
60/60 SYR4 2014–2017
Dibromochloromethane
1.225 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
36/123 SYR4 2012–2019
Lead
0.0056 mg/L 37%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2023
Nitrate-Nitrite
510 µg/L 5.1%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Barium
11.65 µg/L 0.6%
of the EPA limit 2000 µg/L
worst single sample: 12 µg/L
8/8 SYR4 2012–2019
Dibromoacetic Acid
0.3815 µg/L
No EPA limit set
worst single sample: 0.4200 µg/L
8/107 SYR4 2012–2019
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
 1/107 SYR4 2012–2019
Monochloroacetic Acid
1.5 µg/L
No EPA limit set
 1/107 SYR4 2012–2019
61 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Superior Water Light & Power Company

Is Superior Water Light & Power Company tap water safe to drink?

EPA monitoring detected 16 contaminants in Superior Water Light & Power Company'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 Superior Water Light & Power Company's water?

EPA monitoring detected Chloroform, Bromodichloromethane, TTHM, Total Haloacetic Acids (HAA5), Fluoride, and others. The full list with the level and data source for each is above.

How many people does Superior Water Light & Power Company serve?

Superior Water Light & Power Company reports serving 26,084 people in Wisconsin, per its EPA record.

Has Superior Water Light & Power Company had any water quality violations?

The EPA has 25 violations on file for Superior Water Light & Power Company, of which 5 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.