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Water Quality Report

Johnson Creek, WI

Jefferson County · 3,318 residents · 1 water system

11

Contaminants detected

0

PFAS compounds

154

Hardness (mg/L)

0

Above legal limits

1

Above health guidelines

Johnson Creek drinking water comes from groundwater wells. Based on the most recent monitoring data, 11 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, and 7 others. PFAS testing has been conducted with no detections. Water hardness is 154 mg/L (hard), which is within a typical range for the region.

Contaminants detected in Johnson Creek water

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

Lead0.0028 / 0.015 mg/L
19% of EPA limit
Nitrate0.12 / 10 mg/L
1% of EPA limit
Copper56 / 1300 ug/L
4% of EPA limit
Radium4.7 / 5 pCi/L
94% of EPA limit
Uranium0.109 / 30 ug/L
0% of EPA limit
Gross Alpha Radiation10.8 / 15 pCi/L
72% of EPA limit
Total Trihalomethanes0.93 / 80 ug/L
1% of EPA limit
Haloacetic Acids (HAA5)0.19 / 60 ug/L
0% of EPA limit
Nickel0.0023 mg/L
UnregulatedInorganic
Fluoride0.21 / 4 mg/L
5% of EPA limit
Barium0.47 / 2 mg/L
24% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)

Water systems serving Johnson Creek

JOHNSON CREEK WATERWORKS

3,318 servedGroundwater11 contaminants1 above guideline
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Other cities in Jefferson County

Water quality reports for nearby Wisconsin communities.

Fort AtkinsonIxoniaJeffersonLake MillsPalmyraWaterlooWatertown

Frequently asked questions

Is Johnson Creek, WI tap water safe to drink?
Johnson Creek 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. 11 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 Johnson Creek water?
Monitoring has detected 11 contaminants in Johnson Creek's water supply: Lead, Nitrate, Copper, Radium, Uranium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Nickel, Fluoride, Barium. 1 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Johnson Creek water have PFAS?
Johnson Creek's water has been tested for PFAS compounds with no detections. Testing was conducted as part of the EPA's Unregulated Contaminant Monitoring Rule (UCMR5) program.
Is Johnson Creek water hard?
Yes. Johnson Creek water has a hardness of 154 mg/L (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 Johnson Creek get its drinking water?
Johnson Creek'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. Johnson Creek is served by one water system: JOHNSON CREEK WATERWORKS.

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