Public water system record
City of Mercer Island
Serves Mercer Island, King County, WA · 31,057 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Mercer Island in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- City of Mercer Island buys its water from Seattle Public Utilities.
- Record on file since 1992, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 9,450 service lines.
Check whether City of Mercer Island serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Full record since 1992
EPA's records for City of Mercer Island go back to 1992. Before October 19, 2016 they list 1 health-based violation (1 archived by EPA without a recorded fix) and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 3 |
Most recent health-based violation before October 19, 2016: Total Coliform, began January 1992, Archived.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 1992 | Archived |
Where the water comes from
City of Mercer Island buys its water from Seattle Public Utilities. EPA also lists 1 well, all for emergency, seasonal or other part-time use.
Buys water from
- Seattle Public Utilities Seattle, WA
Annual water quality report
City of Mercer Island must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Washington.
Certified drinking water labs by state EPA guidance for private wells