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Review government records associated with Oconomowoc, 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 Oconomowoc, WI from EPA SDWIS.
Oconomowoc Waterworks
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 15,805 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Sep 2023.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Oconomowoc drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
No 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.
Waukesha County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 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
EPA designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
Milwaukee: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Milwaukee-Racine
PM2.5 · PM-2.5 (2006 Standard)
Classification: Former Subpart 1
Original designation: Dec 2009
Current design value: 31 µg/m³ (2023-2025)
Historical designations under the revoked 1997 ozone standard
These records describe historical designations. EPA revoked the 1997 ozone standard on April 6, 2015.
Milwaukee-Racine Area
Historical standard: 0.08 ppm (8-hour)
Historical designation: Maintenance · Subpart 2/Moderate
Original designation: Jun 2004
Open data source: EPA final revocation ruleContinuing requirements have not been verified for this area.
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Jefferson - Laatsch
Annual mean: 0.043 Parts per million
EPA primary exceedance count: 1 (Ozone 8-hour 2015)
Observation year: 2025
Waukesha - Cleveland Ave
Annual mean: 0.044 Parts per million
EPA primary exceedance count: 1 (Ozone 8-hour 2015)
Observation year: 2025
Annual mean: 16.5 Micrograms/cubic meter (25 C)
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.
Premold Corp
Reported: 2024
Vorteq Coil Finishers
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 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
Sites regulated by the Mine Safety and Health Administration, including mines, sand and gravel operations, and portable crushers. Status and type are from the MSHA Mine Data Retrieval System. Records with active/intermittent status dates older than 5 years are shown as older records rather than current active sites.
Recently updated active/intermittent sites (1)
Data from MSHA
Waukesha County, WI
EPA Radon Zone Map (June 2024 release)
Waukesha 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.
Waukesha County, WisconsinPop. 410,434
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 | 4,973 | 7,082 | 7,972 |
| Poor or Fair Health | 9.8% | 12.7% | 14.2% |
| Poor Physical Health Days | 2.7 | 3.1 | 3.3 |
| Poor Mental Health Days | 4.0 | 4.8 | 4.8 |
| Adult Smoking | 11.6% | 13.8% | 15.0% |
| Adult Obesity | 33.7% | 33.5% | 34.0% |
| Air Pollution - Particulate Matter | 9.4 | 7.8 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 6.7% | 7.9% | 9.6% |
| Life Expectancy | 80.7 | 78.2 | 77.6 |
EPA testing found PFAS in water samples from Oconomowoc Waterworks. Results dated Sep 18, 2023 to Sep 27, 2023 include PFBA at 0.0052 to 0.0054 micrograms per liter and PFBS at 0.0045 to 0.0046 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 5 violations for Oconomowoc Waterworks, including 1 marked active.
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 Oconomowoc.
The monitoring station at Jefferson-Laatsch recorded an annual average of 0.043 Parts per million for ozone in 2025.
The monitoring station at Waukesha-Cleveland Ave recorded an annual average of 0.044 Parts per million for ozone in 2025.
The monitoring station at Waukesha-Cleveland Ave recorded an annual average of 16.5 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The radon data for Oconomowoc covers Waukesha County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Oconomowoc reports a life expectancy of 80.7 years in Waukesha 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 Oconomowoc reports 4,973 years of life lost to deaths before age 75 per 100,000 residents in Waukesha 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 Oconomowoc lists fine-particle pollution (PM2.5) at 9.4 micrograms per cubic meter in Waukesha County, Wisconsin.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.