Mountlake Terrace, WA · Snohomish County
MOUNTLAKE TERRACE CITY OF Water System
Current status
No open violations on record as of July 4, 2026.
This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Washington’s official records. Always confirm current status with Washington before making decisions based on this information.
System facts
- System ID (PWSID)
- WA5357250
- System type
- Community Water System
- Population served
- 26,402
- Service connections
- 9,290
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
Violation history
Consumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2024 – February 20, 2025
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
January 1, 2020 – March 31, 2020
ResolvedMonitoring and Reporting (DBP)
—TTHM
January 1, 2020 – March 31, 2020
ResolvedMonitoring and Reporting (DBP)
—TTHM
January 1, 2019 – March 31, 2019
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2017 – January 31, 2018
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2014 – October 8, 2014
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2013 – September 13, 2013
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2011 – August 23, 2011
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 2024 – February 20, 2025 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| January 1, 2020 – March 31, 2020 | Monitoring and Reporting (DBP) | Total Haloacetic Acids (HAA5) | — | Resolved |
| January 1, 2020 – March 31, 2020 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| January 1, 2019 – March 31, 2019 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| July 1, 2017 – January 31, 2018 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| July 1, 2014 – October 8, 2014 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| July 1, 2013 – September 13, 2013 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| July 1, 2011 – August 23, 2011 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- February 20, 2025State Compliance achieved1 linked violation
- June 23, 2020State Compliance achieved1 linked violation
- June 23, 2020State Compliance achieved1 linked violation
- June 11, 2019State Compliance achieved1 linked violation
- January 31, 2018State Compliance achieved1 linked violation
- October 19, 2016State Compliance achieved1 linked violation
- September 15, 2015State Compliance achieved1 linked violation
- October 8, 2014State Compliance achieved1 linked violation
- September 13, 2013State Compliance achieved1 linked violation
- September 28, 2012State Compliance achieved1 linked violation
- August 23, 2011State Compliance achieved1 linked violation
- September 30, 1992State Violation/Reminder Notice1 linked violation
Contact
MOUNTLAKE TERRACE CITY OF
Phone not on record
Mountlake Terrace, WA 98043