WHITEHORSE MERCANTILE WATER SYSTEM
Washington — Transient Non-Community — PWSID: WA5364401
System Information
| PWSID | WA5364401 |
| System Name | WHITEHORSE MERCANTILE WATER SYSTEM |
| System Type | Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Sep 11, 1990 |
| Last Reported | Dec 11, 2025 |
Location & Contact
| State | Washington |
| City | Arlington |
| ZIP Code | 98223 |
| Address | 38710 State Rd 530 NW |
| Organization | WHITEHORSE MERCANTILE WATER SYSTEM |
| Phone | — |
Population & Service
| Population Served | 930 |
| Service Connections | 1 |
Drinking Water Violations (19)
This water system has 19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2018 | Dec 31, 2018 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2018 | Nitrate Rule |
| Jan 1, 2014 | Dec 31, 2014 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2014 | Nitrate Rule |
| Oct 1, 2012 | Oct 31, 2012 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2012 | Total Coliform Rule |
| Jan 1, 2009 | Dec 31, 2009 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2009 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Jan 1, 2007 | Dec 31, 2007 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2007 | Nitrate Rule |
| Feb 1, 1999 | Feb 28, 1999 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Feb 28, 1999 | Total Coliform Rule |
| Nov 1, 1997 | Nov 30, 1997 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Nov 30, 1997 | Total Coliform Rule |
| Aug 1, 1997 | Aug 31, 1997 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Aug 31, 1997 | Total Coliform Rule |
| Dec 1, 1995 | Dec 31, 1995 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Dec 31, 1995 | Total Coliform Rule |
| Aug 1, 1995 | Aug 31, 1995 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Aug 31, 1995 | Total Coliform Rule |
| May 1, 1995 | May 31, 1995 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | May 31, 1995 | Total Coliform Rule |
| Sep 1, 1993 | Sep 30, 1993 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Sep 30, 1993 | Total Coliform Rule |
| Aug 1, 1993 | Aug 31, 1993 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Aug 31, 1993 | Total Coliform Rule |
| Aug 1, 1992 | Aug 31, 1992 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Archived | Aug 31, 1992 | Total Coliform Rule |
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.