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Review government records associated with Mequon, Wisconsin.
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Preparing Mequon environmental records...
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 Mequon, WI from EPA SDWIS.
Mequon Trail Townhomes
Active health-based drinking-water issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 615 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 PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Milwaukee River
Reported: Nov 2026
Health-relevant causes: Metals (other Than Mercury), Pathogens, Polychlorinated Biphenyls (pcbs)
Affected uses: Ecological, Fishconsumption, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
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.
Ozaukee 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
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)
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.
Bayside
Annual mean: 0.044 Parts per million
EPA primary exceedance count: 7 (Ozone 8-hour 2015)
Observation year: 2025
Grafton
Annual mean: 0.043 Parts per million
EPA primary exceedance count: 5 (Ozone 8-hour 2015)
Observation year: 2025
Harrington Beach Park
Annual mean: 0.044 Parts per million
EPA primary exceedance count: 5 (Ozone 8-hour 2015)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
Air Violations
Last inspected: Dec 2025
Data from EPA ECHO
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Bradley Corp
Reported: 2024
Flint Hills Resources Pine Bend LLC Milwaukee Terminal
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 110000416078
Reported: Dec 2015
EPA FRS Registry ID 110009317756
Reported: Nov 2021
EPA FRS Registry ID 110000416586
Reported: Nov 2021
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
No MSHA mine or extraction site records shown for this report.
Ozaukee County, WI
EPA Radon Zone Map (June 2024 release)
Ozaukee County is EPA Radon Zone 2 (moderate potential). EPA defines Zone 2 counties as having predicted average indoor screening levels between 2 pCi/L and 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.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
No records dated within the last 5 years surfaced for this city report.
Reviewed: last 5 years
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Ozaukee County, WisconsinPop. 93,009
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 | 4,810 | 7,082 | 7,972 |
| Poor or Fair Health | 9.3% | 12.7% | 14.2% |
| Poor Physical Health Days | 2.6 | 3.1 | 3.3 |
| Poor Mental Health Days | 4.3 | 4.8 | 4.8 |
| Adult Smoking | 11.1% | 13.8% | 15.0% |
| Adult Obesity | 28.1% | 33.5% | 34.0% |
| Air Pollution - Particulate Matter | 6.9 | 7.8 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 6.5% | 7.9% | 9.6% |
| Life Expectancy | 81.3 | 78.2 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Mequon.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 15 violations for Mequon Trail Townhomes, including 2 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 Mequon.
The monitoring station at Bayside recorded an annual average of 0.044 Parts per million for ozone in 2025.
The monitoring station at Grafton recorded an annual average of 0.043 Parts per million for ozone in 2025.
The monitoring station at Harrington Beach Park recorded an annual average of 0.044 Parts per million for ozone in 2025.
The radon data for Mequon covers Ozaukee County. EPA places this area in Zone 2, with a predicted average indoor radon screening level of 2 to 4 picocuries per liter.
This city report shows 3 Superfund sites: Amcast Industrial Corporation; Lauer I Sanitary Landfill; Veolia Es Technical Solutions LLC.
No brownfield sites were returned for this city report.
View on EPA ECHOView on EPA ECHOView on EPA ECHOEPA brownfield records
The county data for Mequon reports a life expectancy of 81.3 years in Ozaukee 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 Mequon reports 4,810 years of life lost to deaths before age 75 per 100,000 residents in Ozaukee 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 Mequon lists fine-particle pollution (PM2.5) at 6.9 micrograms per cubic meter in Ozaukee County, Wisconsin.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
Federal pipeline records list an incident involving West Shore Pipeline Co near Mequon on May 18, 2015. The reported release was a liquid petroleum product.