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Water Quality Report

Green Lake, WI

Green Lake County · 1,254 residents · 4 water systems

17

Contaminants detected

5

PFAS compounds

351

Hardness (mg/L)

0

Above legal limits

8

Above health guidelines

Green Lake drinking water comes from groundwater wells. Based on the most recent monitoring data, 17 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, and 13 others. PFAS compounds have been detected at trace levels in Green Lake water. Water hardness is 351 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Green Lake water

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

Lead0.0011 / 0.015 mg/L
7% of EPA limit
Nitrate7.9 / 10 mg/L
79% of EPA limit
Arsenic0.00085 / 0.01 mg/L
9% of EPA limit
Copper344 / 1300 ug/L
26% of EPA limit
Radium1.3 / 5 pCi/L
26% of EPA limit
Uranium0.752 / 30 ug/L
3% of EPA limit
Total Trihalomethanes4 / 80 ug/L
5% of EPA limit
Haloacetic Acids (HAA5)0.84 / 60 ug/L
1% of EPA limit
Atrazine0.018 / 3 ug/L
1% of EPA limit
Nickel0.0011 mg/L
UnregulatedInorganic
Selenium0.0012 / 0.05 mg/L
2% of EPA limit
1,4-Dichlorobenzene0.65 / 75 ug/L
1% of EPA limit
PFHpA (Perfluoroheptanoic Acid)1.3 ng/L
UnregulatedPFAS
Antimony0.00025 / 0.006 mg/L
4% of EPA limit
Chromium (total)0.0027 / 0.1 mg/L
3% of EPA limit
Barium0.059 / 2 mg/L
3% of EPA limit
Fluoride0.13 / 4 mg/L
3% of EPA limit
PFAS (5 compounds detected)
Microplastics (not routinely tested)

Water systems serving Green Lake

GREEN LAKE WATERWORKS

1,002 servedGroundwater17 contaminants4 above guidelines
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DAKOTA CAPITAL MHC LLC

102 servedGroundwater25 contaminants1 above guideline
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LAMPLIGHTER MHC LLC

80 servedGroundwater7 contaminants1 above guideline
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GREEN LAKE MHP

70 servedGroundwater9 contaminants2 above guidelines
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Other cities in Green Lake County

Water quality reports for nearby Wisconsin communities.

BerlinMarkesanPrinceton

Frequently asked questions

Is Green Lake, WI tap water safe to drink?
Green Lake tap water meets EPA legal standards (Maximum Contaminant Levels). However, 8 contaminants are present above independent health guidelines, which are often stricter than legal limits. 17 contaminants have been detected in the water supply, including Lead, Nitrate, Arsenic, Copper, Radium. 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 Green Lake water?
Monitoring has detected 17 contaminants in Green Lake's water supply: Lead, Nitrate, Arsenic, Copper, Radium, Uranium, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Nickel, Selenium, 1,4-Dichlorobenzene, PFHpA (Perfluoroheptanoic Acid), Antimony, Chromium (total), Barium, Fluoride. Additionally, 5 PFAS compounds have been detected at trace levels. 8 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Green Lake water have PFAS?
Yes. 5 PFAS compounds have been detected in Green Lake'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 Green Lake water hard?
Yes. Green Lake water has a hardness of 351 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 Green Lake get its drinking water?
Green Lake'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. Green Lake is served by 4 water systems, the largest being GREEN LAKE WATERWORKS (serving 1,002 people).

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