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Water Quality Report

Delafield, WI

Waukesha County · 1,773 residents · 15 water systems

8

Contaminants detected

0

PFAS compounds

400

Hardness (mg/L)

1

Above legal limits

15

Above health guidelines

Delafield drinking water comes from groundwater wells. Based on the most recent monitoring data, 8 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, and 4 others. Water hardness is 400 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.

Contaminants detected in Delafield water

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

Lead0.0114 / 0.015 mg/L
76% of EPA limit
Nitrate0.54 / 10 mg/L
5% of EPA limit
Copper230 / 1300 ug/L
18% of EPA limit
Radium0.5558 / 5 pCi/L
11% of EPA limit
Gross Alpha Radiation4.2 / 15 pCi/L
28% of EPA limit
Nickel0.002 mg/L
UnregulatedInorganic
Barium0.037 / 2 mg/L
2% of EPA limit
Fluoride0.12 / 4 mg/L
3% of EPA limit
Microplastics (not routinely tested)

Water systems serving Delafield

NASHOTAH HOUSE

350 servedGroundwater8 contaminants1 above guideline
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ST JOHNS NORTHWESTERN ACADEMIES

340 servedGroundwater12 contaminants3 above guidelines
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DELAFIELD WATERWORKS

300 servedGroundwater23 contaminants1 above legal limit2 above guidelines
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ARBORS

280 servedGroundwater11 contaminants1 above guideline
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COUNTRY AIRE APARTMENTS 2

90 servedGroundwater4 contaminants1 above guideline
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COUNTRY AIRE APARTMENTS 3

80 servedGroundwater7 contaminants1 above guideline
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RIVER VALLEY APTS NORTH

48 servedGroundwater13 contaminants2 above guidelines
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RIVER VALLEY APTS SOUTH

48 servedGroundwater11 contaminants2 above guidelines
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DELAFIELD LAKES 402

40 servedGroundwater10 contaminants1 above guideline
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DELAFIELD LAKES 404

40 servedGroundwater8 contaminants
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DELAFIELD WOODS 411

40 servedGroundwater8 contaminants
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DELAFIELD WOODS 828

40 servedGroundwater8 contaminants
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SANCTUARY OF DELAFIELD

27 servedGroundwater10 contaminants
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WELLS ST STATION 425 WEST

25 servedGroundwater10 contaminants1 above guideline
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WELLS ST STATION 435 EAST

25 servedGroundwater4 contaminants
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Other cities in Waukesha County

Water quality reports for nearby Wisconsin communities.

BrookfieldButlerDousmanEagleElm GroveHartlandLannonMenomonee FallsMenomonie FallsMukwonagoMuskegoNashotah

Frequently asked questions

Is Delafield, WI tap water safe to drink?
Delafield tap water has 1 contaminant currently measured above EPA legal standards (Maximum Contaminant Levels), and 15 above independent health guidelines. 8 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Radium, Gross Alpha Radiation. View the detailed report for each water system to see specific levels, how they compare to both legal limits and health guidelines, and what actions to take.
What contaminants are in Delafield water?
Monitoring has detected 8 contaminants in Delafield's water supply: Lead, Nitrate, Copper, Radium, Gross Alpha Radiation, Nickel, Barium, Fluoride. 1 of these are above EPA legal limits. 15 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Is Delafield water hard?
Yes. Delafield water has a hardness of 400 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 Delafield get its drinking water?
Delafield'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. Delafield is served by 15 water systems, the largest being NASHOTAH HOUSE (serving 350 people).

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