Mattawa City of
Washington — Community Water System — PWSID: WA5352000
System Information
| PWSID | WA5352000 |
| System Name | Mattawa City of |
| System Type | Community Water System |
| Water Source | Ground Water |
| 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 | Mattawa |
| ZIP Code | 99349 |
| Address | 521 E Government Rd |
| Organization | Mattawa City of |
| Phone | — |
Population & Service
| Population Served | 5,370 |
| Service Connections | 1,026 |
Drinking Water Violations (227)
This water system has 227 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 | MCL | Yes | No | — | — | — | Resolved | Jun 30, 2024 | — | |
| Jul 1, 2023 | — | Other | No | No | — | — | — | Resolved | Sep 20, 2023 | — | |
| Jul 1, 2016 | — | Other | No | No | — | — | — | Resolved | Dec 1, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.1 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.007 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2014 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2014 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.075 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 4.0 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.1 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.1 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.05 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.2 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 1 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.6 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.004 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.010 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.07 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.005 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.002 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.1 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | — | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 0.006 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.2 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.7 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2016 | MR | No | Yes | — | 2 mg/L | — | Resolved | Dec 31, 2016 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.005 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jan 1, 2014 | Dec 31, 2019 | MR | No | Yes | — | 0.07 mg/L | — | Archived | Dec 31, 2019 | — | |
| Jul 1, 2011 | — | Other | No | No | — | — | — | Resolved | Nov 3, 2011 | — | |
| Jan 1, 2011 | Dec 31, 2011 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2011 | — | |
| Jan 1, 2011 | — | MR | No | No | — | TT | — | Resolved | Sep 3, 2014 | — | |
| Jan 1, 2010 | — | MR | No | No | — | TT | — | Resolved | Sep 3, 2014 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | — | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.001 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.05 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.002 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 2 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.0004 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.0002 mg/L | — | Resolved | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.5 mg/L | — | Archived | Dec 31, 2010 | — | |
| Jan 1, 2008 | Dec 31, 2010 | MR | No | Yes | — | 0.05 mg/L | — | Archived | Dec 31, 2010 | — |
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.