Health Violations Found

Williams Bay, WI: Lead Above EPA Action Level

EPA data combined for 2 water systems mapped to this ZIP (largest mapped system: Williams Bay Waterworks)

Health Violations Found System 90th-Percentile Lead Result Exceeds EPA Action Level High County Radon Potential

Health-based violation records by water system:

Williams Bay Waterworks (1)

EPA records for the water systems mapped to 53191 in Williams Bay, WI contain 9 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 1 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

Safety Score N/A

Water Quality Issues 1 health-based violation

Lead Risk High 0.016 mg/L, 90th percentile, sample period ending 2025-06-30

NFIP Claim History N/A

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 1 health-based violation and 8 non-health-based (since 2021).
Lead 90th-percentile lead reading of 0.016 mg/L; the EPA action level of 0.015 mg/L applies to a water system's 90th-percentile result.
Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.

Contaminant Summary

Health Violations

9 violations 1 health-based

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

Water Systems

2,601

People Served

Health Violations (since 2021)Median is 0

Groundwater

Water Source

0.016 mg/L

Reported Lead Result ⚠ Above EPA Action Level7.0× the national median for this measure

Zone 1

County Radon Potential · High

$369K

Median Home Value72% above state median ($214K)

Get updates when new water-quality data is available for your area

Free alerts when new EPA data affects ZIP code 53191. No spam - just safety updates.

Unsubscribe anytime. We only send updates when your safety score changes. See our Privacy Policy.

See incorrect data? Let us know

Williams Bay (53191): one critical alert.

System 90th-Percentile Lead Result Above EPA Action Level CRITICAL

System 90th-percentile lead result of 16 ppb is above the EPA action level of 15 ppb. Lead is especially dangerous for children and pregnant women.

What to do: Get a certified water test and consider an NSF/ANSI 58 reverse osmosis system that is also certified for lead reduction. See Lead & Copper History below ↓ ↓

Score Breakdown

Overall Home Safety Score: Score unavailable

Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.

Canonical components

EPA water compliance

78/100

Observed

PFAS MCL screen

Unknown

Evidence missing

EPA radon zone

0/100

Observed

Annual EPA AirData AQI

100/100

Observed

Required domains

Drinking water

Unknown

Indoor environment

0/100

Outdoor environment

100/100

Coverage: 3 of 4 components and 2 of 3 domains observed.

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

Safety & Health (6) CRITICAL

Your Water System

ZIP code 53191 in Williams Bay, Wisconsin is mapped to the water system Williams Bay Waterworks (EPA ID: WI2650060). This system provides water to approximately 2,601 people from groundwater sources.

There are 2 community water systems serving this area.

Water Systems Serving This Area

System Name	EPA ID	Population	Source
Williams Bay Waterworks	WI2650060	2,601	Groundwater
Inspiration Ministries & Meadows Apts	WI2650148	80	Groundwater

Other Water Quality Reports in Wisconsin

53001 (Adell) - 1 violation recorded for mapped water systems
53002 (Allenton)
53003 (Ashippun)
53004 (Belgium) - 6 violations recorded for mapped water systems
53005 (Brookfield) - 8 violations recorded for mapped water systems
53006 (Brownsville) - 4 violations recorded for mapped water systems
53007 (Butler) - 2 violations recorded for mapped water systems
53008 (Brookfield)
53010 (Campbellsport) - 5 violations recorded for mapped water systems
53011 (Cascade) - 3 violations recorded for mapped water systems
53012 (Cedarburg) - 3 violations recorded for mapped water systems
53013 (Cedar Grove) - 2 violations recorded for mapped water systems
53014 (Chilton) - 2 violations recorded for mapped water systems
53015 (Cleveland) - 2 violations recorded for mapped water systems
53016 (Clyman)
53017 (Colgate) - 6 violations recorded for mapped water systems
53018 (Delafield) - 26 violations recorded for mapped water systems
53019 (Eden)
53020 (Elkhart Lake)
53021 (Fredonia) - 4 violations recorded for mapped water systems

Nearby Water Quality Reports

53125 (Fontana) - 3 mi - 18 violations recorded for mapped water systems
53184 (Walworth) - 4 mi - 22 violations recorded for mapped water systems
53147 (Lake Geneva) - 5 mi - 63 violations recorded for mapped water systems
53195 (Zenda) - 5 mi
53115 (Delavan) - 5 mi - 69 violations recorded for mapped water systems
53176 (Springfield) - 8 mi
53121 (Elkhorn) - 9 mi - 4 violations recorded for mapped water systems
53157 (Pell Lake) - 10 mi
60034 (Hebron, IL) - 10 mi - 2 violations recorded for mapped water systems
53585 (Sharon) - 10 mi - 40 violations recorded for mapped water systems

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Williams Bay Waterworks (WI2650060) 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 →

Environmental Hazards (10) HIGH

Home & Infrastructure (6) MODERATE

Possible home maintenance concerns - talk to a local expert.

Call (855) 384-4856

Paid Partner This is a free service. You will be connected with an independent service provider. We may receive compensation.

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 Williams Bay

Based on local data for ZIP 53191, these services may benefit homeowners in your area.

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

Gutter Installation & Repair

The median home in 53191 was built around 1971. 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

Window Replacement

The median build year of homes in Williams Bay is 1971; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.

Typical cost: Window replacement: typically $300–$800 per window installed

Estimate Your Home Maintenance Costs

Roofing Inspection & Repair

Homes built around 1971 may be on their second or third roof. A professional inspection can catch damage before leaks start.

Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500

Estimate Your Home Insurance Needs

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 53191 safe to drink?

EPA SDWIS records 9 violations since 2021 across the water systems mapped to ZIP 53191 (primary system: Williams Bay Waterworks), including 1 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 53191's water come from?

The recorded water source for Williams Bay Waterworks, a system mapped to ZIP code 53191, is Groundwater. This system serves approximately 2,601 people.

How can I get my water tested in Williams Bay?

If Williams Bay 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 53191 tap water?

The Lead and Copper Rule record selected for 53191 reports a 90th-percentile lead result of 0.016 mg/L for a water system mapped to this ZIP (record date 2025-06-30). The EPA action level is 0.015 mg/L. This system 90th-percentile result is above the EPA lead action level of 0.015 mg/L, which requires corrective action by the system; consider a filter certified for lead reduction.

What is the radon risk for 53191?

53191 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Walworth County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

How to cite this page

APA ZipCheckup. (2026). Williams Bay, WI: Lead Above EPA Action Level. https://zipcheckup.com/report/53191/

BibTeX

@misc{zipcheckup-report-53191,
  author = {{ZipCheckup}},
  title  = {{Williams Bay, WI: Lead Above EPA Action Level}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/53191/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 53191

ZIP Code	City, State	Distance	Grade	Violations
53125	Fontana, WI	2.7 mi	N/A	18
53184	Walworth, WI	4.2 mi	N/A	22
53147	Lake Geneva, WI	4.5 mi	F	63
53195	Zenda, WI	5.3 mi	N/A	0
53115	Delavan, WI	5.3 mi	D	69
53176	Springfield, WI	7.7 mi	N/A	0
53121	Elkhorn, WI	8.6 mi	C	4
53157	Pell Lake, WI	9.7 mi	N/A	0
60034	Hebron, IL	10.1 mi	N/A	2
53585	Sharon, WI	10.1 mi	N/A	40

Nearby ZIP Code Reports

53190 Whitewater, WI 53192 Wilmot, WI 53189 Waukesha, WI 53188 Waukesha, WI 53194 Woodworth, WI

2026 Rankings for Your Area

Lead Risk 2026 Rankings A water system serving this ZIP reported lead above the EPA action level Home Safety 2026 Rankings EPA Radon Zone 1 (county-level potential) Mold Risk 2026 Rankings Elevated mold risk score

Overall safety breakdown

Home Safety Score →

Find the right water filter

Water Filter Matcher →

Compare filters, tests & services

Compare My Options →

Compare with another ZIP

Compare Tool →

2026 Rankings

Lead Risk Rankings 2026 Home Safety Rankings 2026

Coverage: 13/17 risk factors Data sources →

What We Found for 53191

⚠ 1 health-based violation recorded for mapped water systems (since 2021)
⚠ A serving water system's 90th-percentile lead result exceeds the EPA action level
⚠ EPA Radon Zone 1 (county-level potential; test the home)

Free tip: If water has been sitting for several hours, let cold water run for 2 minutes before drinking - this can reduce lead in the water, but it does not remove lead from your pipes.

System Details

EPA ID: WI2650060

System: Williams Bay Waterworks

View full system report →

View EPA report →

Largest water system mapped to this ZIP

Williams Bay Waterworks

1 health-based violation

EPA's service-area model places about 1,332 of the roughly 3,264 residents of this ZIP in this system's area. Other homes may be on a different system or a private well.

EPA ID: WI2650060

Source: Groundwater

Serving: ~2,601 people

Full system report → View on EPA →

Also serves parts of this ZIP

Mapped service-area boundaries show 1 other water system whose areas overlap this ZIP. Coverage varies by street; confirm the provider for your address.