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Review government records associated with Mercer Island, Washington.
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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 Mercer Island, WA from EPA SDWIS.
Mercer Island City of
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 31,057 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.
Lake Washington-Sammamish River
Reported: Nov 2026
Health-relevant causes: Mercury, Metals (other Than Mercury), Pathogens
Affected uses: Ecological, 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
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.
King 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 designations apply to a specific pollutant and federal air quality standard (NAAQS). EPA can issue a clean-data determination while a formal designation remains in effect.
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Seattle-Tacoma Area
CO · Carbon Monoxide (1971 Standard)
Classification: Moderate > 12.7ppm
Original designation: Nov 1990
Current design value: 0.9 ppm (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Bremerton-Spruce Ave
Annual mean: 4.4 Micrograms/cubic meter (LC)
Observation year: 2025
Everett-Beverly Park Rd
Annual mean: 7.3 Micrograms/cubic meter (25 C)
Observation year: 2025
Annual mean: 4.3 Micrograms/cubic meter (LC)
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
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 110005326520
Reported: Nov 2021
Reviewed: source query run Nov 2026
State environmental agencies maintain cleanup site databases that include state Superfund, voluntary cleanup, and brownfield remediation programs. These programs track additional sites beyond those on the federal NPL.
No state cleanup site records with active investigation or remediation status surfaced nearby.
Reviewed: active/open records as of WA Ecology TCP (live query)
Data from EPA ECHO
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
Release reports
Reported: Dec 2021
Reported: Dec 2021
Data from EPA UST Finder
No MSHA mine or extraction site records shown for this report.
King County, WA
EPA Radon Zone Map (June 2024 release)
King County is EPA Radon Zone 3 (low potential). EPA defines Zone 3 counties as having predicted average indoor screening levels below 2 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.
King County, WashingtonPop. 2,266,789
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 | 5,119 | 6,333 | 7,972 |
| Poor or Fair Health | 11.5% | 13.8% | 14.2% |
| Poor Physical Health Days | 3.0 | 3.5 | 3.3 |
| Poor Mental Health Days | 4.9 | 5.2 | 4.8 |
| Adult Smoking | 9.0% | 10.8% | 15.0% |
| Adult Obesity | 23.3% | 28.7% | 34.0% |
| Air Pollution - Particulate Matter | 8.3 | 7.1 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 7.1% | 7.9% | 9.6% |
| Life Expectancy | 81.6 | 79.4 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Mercer Island.
Check with the utility that serves your address for its testing results.
The EPA drinking water records available here list no violations for the City of Mercer Island.
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 Mercer Island.
The monitoring station at Bremerton-Spruce Ave recorded an annual average of 4.4 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Everett-Beverly Park Rd recorded an annual average of 7.3 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Everett-Beverly Park Rd recorded an annual average of 4.3 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The radon data for Mercer Island covers King County. EPA places this area in Zone 3, with a predicted average indoor radon screening level below 2 picocuries per liter.
This city report shows 1 Superfund site: Quendall Terminals.
No brownfield sites were returned for this city report.
The county data for Mercer Island reports a life expectancy of 81.6 years in King County, Washington.
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 Mercer Island reports 5,119 years of life lost to deaths before age 75 per 100,000 residents in King County, Washington. 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 Mercer Island lists fine-particle pollution (PM2.5) at 8.3 micrograms per cubic meter in King County, Washington.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.