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Review government records associated with Delavan, Wisconsin.
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Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Delavan, WI from EPA SDWIS.
Delavan Waterworks
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 8,451 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASNo health-relevant impairment records shown among the assessment records in this report.
Reviewed: source records as of 2026
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Data from EPA ECHO
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Walworth County
Assessment year: 2020
According to EPA, a cancer risk of 20-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 20 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
No EPA nonattainment designation records shown for this report.
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Beloit - Converse
Annual mean: 0.044 Parts per million
EPA primary exceedance count: 1 (Ozone 8-hour 2015)
Observation year: 2025
Elkhorn
Annual mean: 0.045 Parts per million
EPA primary exceedance count: 3 (Ozone 8-hour 2015)
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Spx Flow US LLC
Reported: 2024
Spx Flow US LLC
Reported: 2024
EPA records for current, proposed and formerly listed Superfund sites on the National Priorities List (NPL).
Open data source: Search EPA ECHOEPA FRS Registry ID 110009318005
Reported: Nov 2021
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO2 sites with active cleanup or investigation status
902 E Wisconsin St, Delavan
Reported: Feb 2026
223 S 7th St, Delavan
Reported: Feb 2026
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Reviewed: reporting year 2024
No MSHA mine or extraction site records shown for this report.
Walworth County, WI
EPA Radon Zone Map (June 2024 release)
Walworth County is EPA Radon Zone 1 (highest potential). EPA defines Zone 1 counties as having predicted average indoor screening levels above 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
No FEMA flood-zone records shown for this report.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Walworth County, WisconsinPop. 105,380
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 7,027 | 7,082 | 7,972 |
| Poor or Fair Health | 12.7% | 12.7% | 14.2% |
| Poor Physical Health Days | 3.1 | 3.1 | 3.3 |
| Poor Mental Health Days | 4.7 | 4.8 | 4.8 |
| Adult Smoking | 14.4% | 13.8% | 15.0% |
| Adult Obesity | 36.9% | 33.5% | 34.0% |
| Air Pollution - Particulate Matter | 9.2 | 7.8 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 7.8% | 7.9% | 9.6% |
| Life Expectancy | 78.2 | 78.2 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Delavan.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 4 violations for Delavan Waterworks.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Delavan.
The monitoring station at Beloit-Converse recorded an annual average of 0.044 Parts per million for ozone in 2025.
The monitoring station at Elkhorn recorded an annual average of 0.045 Parts per million for ozone in 2025.
The radon data for Delavan covers Walworth County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
This city report shows 1 Superfund site: Delavan Municipal Well #4.
This city report shows 3 brownfield sites: 919 1 2 Ann St 10; Borg Plant Property 11; Clark Property 13.
View on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Delavan reports a life expectancy of 78.2 years in Walworth County, Wisconsin.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Delavan reports 7,027 years of life lost to deaths before age 75 per 100,000 residents in Walworth County, Wisconsin. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Delavan lists fine-particle pollution (PM2.5) at 9.2 micrograms per cubic meter in Walworth County, Wisconsin.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.