DIABLO WTR SYS-SEATTLE CITY LIGHT
Washington - Community Water System - PWSID: WA5319200
System Information
| PWSID | WA5319200 |
| System Name | DIABLO WTR SYS-SEATTLE CITY LIGHT |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 7, 1981 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Washington |
| City | Mt Vernon |
| ZIP Code | 98273 |
| Address | 14263 Calhoun Rd |
| Organization | DIABLO WTR SYS-SEATTLE CITY LIGHT |
| Phone | - |
Population & Service
| Population Served | 53 |
| Service Connections | 41 |
Drinking Water Violations (35)
This water system has 35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 23, 2025 | - | TT | Yes | No | - | TT | - | Resolved | Feb 6, 2026 | - | |
| Jul 1, 2024 | - | Other | No | No | - | - | - | Resolved | Jun 22, 2025 | - | |
| Jan 1, 2022 | Dec 31, 2022 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jul 1, 2021 | - | Other | No | No | - | - | - | Resolved | Nov 29, 2021 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.080 mg/L | - | Resolved | Dec 31, 2023 | - | |
| Jan 1, 2021 | Dec 31, 2023 | MR | No | Yes | - | 0.060 mg/L | - | Resolved | Dec 31, 2023 | - | |
| Jul 1, 2013 | - | Other | No | No | - | - | - | Resolved | Oct 16, 2013 | - | |
| Jul 1, 2011 | - | Other | No | No | - | - | - | Resolved | Oct 31, 2011 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Dec 31, 2006 | - | |
| Jan 1, 2004 | Dec 31, 2004 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2004 | - | |
| Jan 1, 2000 | Jan 1, 2001 | MR | No | No | - | TT | - | Archived | Jan 1, 2001 | - | |
| Nov 1, 1992 | Nov 30, 1992 | MCL | Yes | No | - | 5% of samples | - | Archived | Nov 30, 1992 | - | |
| May 1, 1992 | May 31, 1992 | MR | No | Yes | - | 5% of samples | - | Archived | May 31, 1992 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 10 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 0.05 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 15 pCi/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 0.005 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 0.002 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 0.010 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 4.0 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 2 mg/L | - | Archived | Oct 31, 1979 | - | |
| Oct 1, 1979 | Oct 31, 1979 | MR | No | No | - | 0.1 mg/L | - | Archived | Oct 31, 1979 | - | |
| - | - | - | 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.