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Water Quality Report

Oregon, WI

Dane County · 12,324 residents · 3 water systems

19

Contaminants detected

0

PFAS compounds

325

Hardness (mg/L)

0

Above legal limits

5

Above health guidelines

Oregon drinking water comes from groundwater wells. Based on the most recent monitoring data, 19 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radon, and 15 others. PFAS testing has been conducted with no detections. Water hardness is 325 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Oregon water

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

Lead0.005 / 0.015 mg/L
33% of EPA limit
Nitrate4.2 / 10 mg/L
42% of EPA limit
Copper35 / 1300 ug/L
3% of EPA limit
Radon311 pCi/L
UnregulatedRadionuclide
Radium3.7 / 5 pCi/L
75% of EPA limit
Uranium1.3 / 30 ug/L
4% of EPA limit
Gross Alpha Radiation7.5 / 15 pCi/L
50% of EPA limit
Total Trihalomethanes3.1 / 80 ug/L
4% of EPA limit
Haloacetic Acids (HAA5)0 / 60 ug/L
0% of EPA limit
Atrazine0.023 / 3 ug/L
1% of EPA limit
Nickel0.0012 mg/L
UnregulatedInorganic
Selenium0.0045 / 0.05 mg/L
9% of EPA limit
Xylenes0.22 / 10000 ug/L
0% of EPA limit
Fluoride0.705 / 4 mg/L
18% of EPA limit
Chromium (total)0.0018 / 0.1 mg/L
2% of EPA limit
Barium0.0259 / 2 mg/L
1% of EPA limit
Ethylbenzene0.16 / 700 ug/L
0% of EPA limit
Styrene0.51 / 100 ug/L
1% of EPA limit
Toluene0.2 / 1000 ug/L
0% of EPA limit
PFAS (tested — none detected)
Microplastics (not routinely tested)

Water systems serving Oregon

OREGON WATERWORKS

11,200 servedGroundwater19 contaminants2 above guidelines
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OAKHILL CORRECTIONAL INST

1,096 servedGroundwater25 contaminants2 above guidelines
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COUNTRY VINEYARD 4

28 servedGroundwater0 contaminants1 above guideline
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Other cities in Dane County

Water quality reports for nearby Wisconsin communities.

Black EarthBlue MoundsCambridgeCottage GroveCross PlainsDaneDeerfieldDeforestFitchburgMadisonMarshallMazomanie

Frequently asked questions

Is Oregon, WI tap water safe to drink?
Oregon tap water meets EPA legal standards (Maximum Contaminant Levels). However, 5 contaminants are present above independent health guidelines, which are often stricter than legal limits. 19 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radon, 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 Oregon water?
Monitoring has detected 19 contaminants in Oregon's water supply: Lead, Nitrate, Copper, Radon, Radium, Uranium, Gross Alpha Radiation, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Nickel, Selenium, Xylenes, Fluoride, Chromium (total), Barium, Ethylbenzene, Styrene, Toluene. 5 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Oregon water have PFAS?
Oregon'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 Oregon water hard?
Yes. Oregon water has a hardness of 325 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 Oregon get its drinking water?
Oregon'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. Oregon is served by 3 water systems, the largest being OREGON WATERWORKS (serving 11,200 people).

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