TUALATIN, CITY OF
Oregon — Community Water System — PWSID: OR4100906
System Information
| PWSID | OR4100906 |
| System Name | TUALATIN, 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 | No |
| First Reported | Mar 12, 1979 |
| Last Reported | Dec 23, 2025 |
Location & Contact
| State | Oregon |
| City | TUALATIN |
| ZIP Code | 97062 |
| Address | 18880 SW MARTINAZZI AVE |
| Organization | TUALATIN, CITY OF |
| Phone | 503-691-3095 |
Population & Service
| Population Served | 28,106 |
| Service Connections | 7,400 |
Drinking Water Violations (10)
This water system has 10 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun 1, 2024 | Jun 30, 2024 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Jun 30, 2024 | Revised Total Coliform Rule |
| Oct 1, 2019 | Dec 31, 2019 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Dec 31, 2019 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Oct 1, 2019 | Dec 31, 2019 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Dec 31, 2019 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2019 | Jan 31, 2019 | Revised Total Coliform Rule | MON | No | Yes | — | — | — | Resolved | Jan 31, 2019 | Revised Total Coliform Rule |
| Jan 1, 2017 | Mar 31, 2017 | TTHM | MR | No | Yes | — | 0.080 mg/L | — | Resolved | Mar 31, 2017 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2017 | Mar 31, 2017 | Total Haloacetic Acids (HAA5) | MR | No | Yes | — | 0.060 mg/L | — | Resolved | Mar 31, 2017 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Aug 1, 2007 | Aug 31, 2007 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2007 | Total Coliform Rule |
| Aug 1, 2007 | Aug 31, 2007 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2007 | Total Coliform Rule |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.