ZipCheckup grade for 53066: C.

A mixed picture - some signals here are worth your attention.

Your top priority: test this home for radon. Check your ZIP → EPA radon map

Health Violations Found
C 60

Oconomowoc, WI (53066): PFAS Detected in Mapped Water Systems - 60/100

EPA data combined for 11 water systems mapped to this ZIP (largest mapped system: Oconomowoc Waterworks)

Health Violations Found PFAS Detected High County Radon Potential

Health-based violation records by water system:

EPA records for the water systems mapped to 53066 in Oconomowoc, WI contain 10 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 2 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
C 60/100
Water Quality Issues 2 health-based violation records
Lead Risk Moderate 0.0068 mg/L, 90th percentile, sample period ending 2023-09-30
NFIP Claim History Claim records 37 claims
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 2 health-based violations and 8 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result of 0.0068 mg/L is below the EPA action level, but EPA's health goal for lead is zero; filtration is advisable.
  • PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
  • Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
  • Flood 37 cumulative NFIP claim records. Check the current FEMA map for a specific address.
Contaminant Summary
Health Violations
10 violations 2 health-based PFAS detected
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record
C
ZIP-level Home Safety model score: 60 / 100
Bottom 19% of U.S. ZIP codes
11
Water Systems
15,805
People Served
2
Health Violations (since 2021)Median is 0
Groundwater
Water Source
0.0068 mg/L
Reported Lead Result3.0× the national median for this measure
Zone 1
County Radon Potential · High
$403K
Median Home Value88% above state median ($214K)

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Score Breakdown

Overall Home Safety Score: 60/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
58/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
0/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
79/100
Indoor environment
0/100
Outdoor environment
100/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (7) CRITICAL

Your Water System

ZIP code 53066 in Oconomowoc, Wisconsin is mapped to the water system Oconomowoc Waterworks (EPA ID: WI2680227). This system provides water to approximately 15,805 people from groundwater sources.

There are 11 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
Oconomowoc Waterworks WI2680227 15,805 Groundwater
Sunnyfield Acres WI2680225 300 Groundwater
Lake Drive Water Trust WI2683440 500 Groundwater
Parquelynn Village WI2680261 450 Groundwater
Muskego Lake Aire Apartments WI2680218 35 Groundwater

Other Water Quality Reports in Wisconsin

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Oconomowoc Waterworks (WI2680227) on EPA.gov.

5 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 53066.

Detected compounds: PFBA, PFBS.

Highest measured level: 0.0054 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

📊 EPA UCMR5 · View source →
Environmental Hazards (11) MODERATE
Home & Infrastructure (6) OK
Cost & Community (9) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Protect Your Home in Oconomowoc

Based on local data for ZIP 53066, these services may benefit homeowners in your area.

Based on local data for your area. Use the tools below to explore your options.

Home & Flood Insurance

The ZIP code for this report in Oconomowoc has 37 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.

Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote

Check Your Flood Zone (Free)

FEMA flood map lookup - see if your property is in a flood zone

Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)

Gutter Installation & Repair

The median home in 53066 was built around 1988. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.

Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home

Estimate Your Home Maintenance Costs

Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.

Frequently Asked Questions

Is the tap water in 53066 safe to drink?

EPA SDWIS records 10 violations since 2021 across the water systems mapped to ZIP 53066 (primary system: Oconomowoc Waterworks), including 2 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 53066's water come from?

The recorded water source for Oconomowoc Waterworks, a system mapped to ZIP code 53066, is Groundwater. This system serves approximately 15,805 people.

How does Oconomowoc water compare to the national average?

Oconomowoc's Home Safety Score ranks lower than 81% of U.S. ZIP codes, and lower than 86% of ZIP codes within Wisconsin.

How can I get my water tested in Oconomowoc?

If Oconomowoc Waterworks supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

Is lead a concern in 53066 tap water?

The Lead and Copper Rule record selected for 53066 reports a 90th-percentile lead result of 0.0068 mg/L for a water system mapped to this ZIP (record date 2023-09-30). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 53066?

53066 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Waukesha County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 53066's water?

Yes, PFAS have been detected in samples from water systems mapped to 53066. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

What does the NFIP claim history show for ZIP 53066?

FEMA records contain 37 flood insurance claims filed in ZIP code 53066; the recorded rated-zone value (the most frequent one if there are several claims) is A, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.

How to cite this page

APA ZipCheckup. (2026). Oconomowoc, WI (53066): PFAS Detected in Mapped Water Systems - 60/100. https://zipcheckup.com/report/53066/
BibTeX 
@misc{zipcheckup-report-53066,
  author = {{ZipCheckup}},
  title  = {{Oconomowoc, WI (53066): PFAS Detected in Mapped Water Systems - 60/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/53066/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 53066

ZIP Code City, State Distance Grade Violations
53069 Okauchee, WI 2.7 mi N/A 2
53058 Nashotah, WI 3.9 mi N/A 23
53036 Ixonia, WI 5.8 mi N/A 0
53018 Delafield, WI 6.1 mi N/A 26
53118 Dousman, WI 6.6 mi N/A 3
53064 North Lake, WI 6.7 mi N/A 0
53029 Hartland, WI 7.2 mi F 50
53003 Ashippun, WI 7.2 mi N/A 0
53183 Wales, WI 8.8 mi N/A 76
53056 Merton, WI 9.3 mi N/A 0

Contaminants Detected in 53066

Learn more about the contaminants found in your water supply:

Overall safety breakdown

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Coverage: 14/17 risk factors Data sources →
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