Mercer Island City Of
As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
WA / Mercer Island
WA · Tap water records
Mercer Island tap water, in plain English
Here is what the EPA's own data shows about tap water in Mercer Island. According to EPA SDWIS data retrieved June 2026, Mercer Island is served by 2 active community water systems, together reported to serve about 31,153 people.
As of June 2026, EPA records show 1 violation across the community water system(s) serving Mercer Island, going back to the earliest EPA record. None were health-based; the records are monitoring or reporting violations (a required test or report was late or missed). Each is listed by system below, with its status.
- 2Community water systems
- ~31,153People served (EPA-reported)
- June 2026EPA records reviewed through
What the EPA has on record, by system
Spring Glen Mobile Home Park
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2011. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.