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Water Quality Report

Markesan, WI

Green Lake County · 1,365 residents · 1 water system

13

Contaminants detected

0

PFAS compounds

310

Hardness (mg/L)

0

Above legal limits

1

Above health guidelines

Markesan 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. Water hardness is 310 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Markesan water

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

Lead0.0071 / 0.015 mg/L
47% of EPA limit
Nitrate7.5 / 10 mg/L
75% of EPA limit
Copper140 / 1300 ug/L
11% of EPA limit
Radium0.997 / 5 pCi/L
20% of EPA limit
Uranium0.486 / 30 ug/L
2% of EPA limit
Gross Alpha Radiation0.745 / 15 pCi/L
5% of EPA limit
Trichloroethylene0.26 / 5 ug/L
5% of EPA limit
Total Trihalomethanes4.8 / 80 ug/L
6% of EPA limit
Haloacetic Acids (HAA5)0.54 / 60 ug/L
1% of EPA limit
Atrazine0.018 / 3 ug/L
1% of EPA limit
Nickel0.002 mg/L
UnregulatedInorganic
Fluoride0.11 / 4 mg/L
3% of EPA limit
Barium0.086 / 2 mg/L
4% of EPA limit
Microplastics (not routinely tested)

Water systems serving Markesan

MARKESAN WATERWORKS

1,365 servedGroundwater13 contaminants1 above guideline
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Other cities in Green Lake County

Water quality reports for nearby Wisconsin communities.

BerlinGreen LakePrinceton

Frequently asked questions

Is Markesan, WI tap water safe to drink?
Markesan tap water meets EPA legal standards (Maximum Contaminant Levels). However, 1 contaminant is 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 Markesan water?
Monitoring has detected 13 contaminants in Markesan's water supply: Lead, Nitrate, Copper, Radium, Uranium, Gross Alpha Radiation, Trichloroethylene, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Nickel, Fluoride, Barium. 1 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Is Markesan water hard?
Yes. Markesan water has a hardness of 310 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 Markesan get its drinking water?
Markesan'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. Markesan is served by one water system: MARKESAN WATERWORKS.

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