MOUNTLAKE TERRACE CITY OF
Washington - Community Water System - PWSID: WA5357250
System Information
| PWSID | WA5357250 |
| System Name | MOUNTLAKE TERRACE CITY OF |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | Yes |
| First Reported | Feb 7, 1981 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Washington |
| City | Mountlake Terrace |
| ZIP Code | 98043 |
| Address | 23204 58th Ave W |
| Organization | MOUNTLAKE TERRACE CITY OF |
| Phone | - |
Population & Service
| Population Served | 26,402 |
| Service Connections | 9,290 |
Drinking Water Violations (12)
This water system has 12 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2024 | - | Other | No | No | - | - | - | Resolved | Feb 20, 2025 | - | |
| Jan 1, 2020 | Mar 31, 2020 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Mar 31, 2020 | - | |
| Jan 1, 2020 | Mar 31, 2020 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Mar 31, 2020 | - | |
| Jan 1, 2019 | Mar 31, 2019 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Mar 31, 2019 | - | |
| Jul 1, 2017 | - | Other | No | No | - | - | - | Resolved | Jan 31, 2018 | - | |
| Jul 1, 2016 | - | Other | No | No | - | - | - | Resolved | Oct 19, 2016 | - | |
| Jul 1, 2015 | - | Other | No | No | - | - | - | Resolved | Sep 15, 2015 | - | |
| Jul 1, 2014 | - | Other | No | No | - | - | - | Resolved | Oct 8, 2014 | - | |
| Jul 1, 2013 | - | Other | No | No | - | - | - | Resolved | Sep 13, 2013 | - | |
| Jul 1, 2012 | - | Other | No | No | - | - | - | Resolved | Sep 28, 2012 | - | |
| Jul 1, 2011 | - | Other | No | No | - | - | - | Resolved | Aug 23, 2011 | - | |
| Sep 1, 1992 | Sep 30, 1992 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1992 | - |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.