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Tap water quality report

Walworth Waterworks

EPA monitoring tested this supplier for 73 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

73
contaminants tested
18
detected
2,304
people served
7
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Walworth

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.

7
health-based violations
59
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2020-02-15
TT Health-based Resolved 2020-02-15
TT Health-based Resolved 2020-02-15
TT Health-based Resolved 2020-02-15
MCL Health-based Resolved 2000-06-01 → 2000-06-30
MCL Health-based Resolved 2000-06-01 → 2000-06-30
MCL Health-based Resolved 2000-06-01 → 2000-06-30
MR Monitoring Resolved 2024-10-01
MR Monitoring Resolved 2024-10-01
Other Monitoring Resolved 2024-07-01

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
Nitrate
5900 µg/L 59%
of the EPA limit 10000 µg/L
worst single sample: 6100 µg/L
186/186 SYR4 2012–2017
Nitrate-Nitrite
5776.5 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 6020 µg/L
32/32 SYR4 2014–2019
Copper
171 µg/L 13%
of the EPA limit 1300 µg/L
worst single sample: 190 µg/L
20/20 SYR4 2014–2017
Lead
24.8 µg/L 165%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 140 µg/L
19/20 SYR4 2014–2017
Lead
0.0063 mg/L 42%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2025
Bromodichloromethane
1.806 µg/L
No EPA limit set
worst single sample: 1.81 µg/L
9/9 SYR4 2013–2019
Dibromochloromethane
1.7 µg/L
No EPA limit set
 9/9 SYR4 2013–2019
TTHM
6.282 µg/L 7.9%
of the EPA limit 80 µg/L
worst single sample: 6.47 µg/L
9/9 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
3.03 µg/L 5.1%
of the EPA limit 60 µg/L
worst single sample: 3.19 µg/L
9/9 SYR4 2013–2019
Chloroform
2.513 µg/L
No EPA limit set
worst single sample: 2.52 µg/L
8/11 SYR4 2013–2019
Barium
78.25 µg/L 3.9%
of the EPA limit 2000 µg/L
worst single sample: 79 µg/L
6/6 SYR4 2014–2017
Dibromoacetic Acid
0.8300 µg/L
No EPA limit set
worst single sample: 0.8600 µg/L
6/9 SYR4 2013–2019
Fluoride
138.5 µg/L 3.5%
of the EPA limit 4000 µg/L
worst single sample: 140 µg/L
4/6 SYR4 2014–2017
Trichloroacetic Acid
0.8855 µg/L
No EPA limit set
worst single sample: 0.8900 µg/L
4/9 SYR4 2013–2019
Combined Radium (-226 And -228)
2.0228 pCi/L 40%
of the EPA limit 5 pCi/L
worst single sample: 2.092 pCi/L
3/3 SYR4 2014
Dichloroacetic Acid
1.671 µg/L
No EPA limit set
worst single sample: 1.77 µg/L
3/9 SYR4 2013–2019
Bromoform
0.7620 µg/L
No EPA limit set
worst single sample: 0.7700 µg/L
2/9 SYR4 2013–2019
Monobromoacetic Acid
0.3900 µg/L
No EPA limit set
 1/9 SYR4 2013–2019
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Walworth Waterworks

Is Walworth Waterworks tap water safe to drink?

EPA monitoring detected 18 contaminants in Walworth 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 Walworth Waterworks's water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Lead, Lead, and others. The full list with the level and data source for each is above.

How many people does Walworth Waterworks serve?

Walworth Waterworks reports serving 2,304 people in Wisconsin, per its EPA record.

Has Walworth Waterworks had any water quality violations?

The EPA has 59 violations on file for Walworth Waterworks, of which 7 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.