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Water Quality Report

Lake Geneva, WI

Walworth County · 13,053 residents · 6 water systems

13

Contaminants detected

5

PFAS compounds

370

Hardness (mg/L)

0

Above legal limits

12

Above health guidelines

Lake Geneva drinking water comes from groundwater wells. Based on the most recent monitoring data, 13 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, and 9 others. PFAS compounds have been detected at trace levels in Lake Geneva water. Water hardness is 370 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Lake Geneva water

Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.

Lead0.008 / 0.015 mg/L
53% of EPA limit
Nitrate0.93 / 10 mg/L
9% of EPA limit
Copper71 / 1300 ug/L
5% of EPA limit
Radium0.621 / 5 pCi/L
12% of EPA limit
Uranium0.167 / 30 ug/L
1% of EPA limit
Total Trihalomethanes29.2 / 80 ug/L
37% of EPA limit
Haloacetic Acids (HAA5)6.3 / 60 ug/L
11% of EPA limit
Nickel0.0014 mg/L
UnregulatedInorganic
Xylenes0.33 / 10000 ug/L
0% of EPA limit
Fluoride0.78 / 4 mg/L
20% of EPA limit
Ethylbenzene0.21 / 700 ug/L
0% of EPA limit
Barium0.1 / 2 mg/L
5% of EPA limit
PFHpA (Perfluoroheptanoic Acid)0.79 ng/L
UnregulatedPFAS
PFAS (5 compounds detected)
Microplastics (not routinely tested)

Water systems serving Lake Geneva

LAKE GENEVA UTILITY COMMISSION

7,107 servedGroundwater13 contaminants1 above guideline
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LAKE COMO SANITARY DIST 1

3,038 servedGroundwater20 contaminants3 above guidelines
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GENEVA NATIONAL COMMUNITY SERVICES

2,250 servedGroundwater15 contaminants3 above guidelines
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INTERLAKEN RESORT AND VILLAGE

500 servedGroundwater11 contaminants3 above guidelines
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COACHMANS TERRACE MHP

125 servedGroundwater7 contaminants1 above guideline
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SAGE MEADOW OF LAKE GENEVA

33 servedGroundwater9 contaminants1 above guideline
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Other cities in Walworth County

Water quality reports for nearby Wisconsin communities.

DarienDelavanEast TroyElkhornFontanaGenoa CityPell LakeSharonTroy CenterWalworthWhitewaterWilliams Bay

Frequently asked questions

Is Lake Geneva, WI tap water safe to drink?
Lake Geneva tap water meets EPA legal standards (Maximum Contaminant Levels). However, 12 contaminants are present above independent health guidelines, which are often stricter than legal limits. 13 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, Uranium. View the detailed report for each water system to see specific levels and how they compare to both legal limits and health guidelines.
What contaminants are in Lake Geneva water?
Monitoring has detected 13 contaminants in Lake Geneva's water supply: Lead, Nitrate, Copper, Radium, Uranium, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Xylenes, Fluoride, Ethylbenzene, Barium, PFHpA (Perfluoroheptanoic Acid). Additionally, 5 PFAS compounds have been detected at trace levels. 12 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Lake Geneva water have PFAS?
Yes. 5 PFAS compounds have been detected in Lake Geneva's water supply at trace levels. PFAS are sometimes called "forever chemicals" because they do not break down in the environment. The EPA has set Maximum Contaminant Levels for several PFAS compounds. View the detailed report for specific concentrations.
Is Lake Geneva water hard?
Yes. Lake Geneva water has a hardness of 370 mg/L (very hard). Hard water is not a health concern but can cause scale buildup in water heaters and appliances, reduce soap effectiveness, and leave mineral deposits. Water softeners or conditioning systems can address hardness.
Where does Lake Geneva get its drinking water?
Lake Geneva's drinking water comes from groundwater wells that draw from underground aquifers. The water is treated and tested according to Wisconsin DNR and EPA requirements before distribution. Lake Geneva is served by 6 water systems, the largest being LAKE GENEVA UTILITY COMMISSION (serving 7,107 people).

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