MCCOY LAKE
Washington - Community Water System - PWSID: 105300021
System Information
| PWSID | 105300021 |
| System Name | MCCOY LAKE |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Native American |
| EPA Region | 10 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jan 27, 1981 |
| Last Reported | Mar 25, 2026 |
Location & Contact
| State | Washington |
| City | WELLPINIT |
| ZIP Code | 99040 |
| Address | 6195 FORD-WELLPINIT RD |
| Organization | CULLOOYAH, MARIA |
| Phone | 509-458-6529 |
Population & Service
| Population Served | 325 |
| Service Connections | 90 |
Drinking Water Violations (456)
This water system has 456 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 1, 2025 | Nov 30, 2025 | MON | No | Yes | - | - | - | Archived | Nov 30, 2025 | - | |
| Apr 3, 2025 | - | Other | No | No | - | - | - | Resolved | Jul 30, 2025 | - | |
| Mar 9, 2025 | - | Other | No | No | - | - | - | Resolved | Jul 30, 2025 | - | |
| Jan 5, 2025 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Jan 5, 2025 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Jan 5, 2025 | - | TT | Yes | No | - | - | - | Resolved | Jul 28, 2025 | - | |
| Jan 5, 2025 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Jan 5, 2025 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Oct 17, 2024 | - | TT | Yes | No | - | - | - | Unaddressed | - | - | |
| Apr 1, 2023 | - | RPT | No | No | - | - | - | Resolved | May 19, 2023 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 5 pCi/L | - | Archived | Dec 31, 2025 | - | |
| Jun 1, 2022 | Jun 30, 2022 | MON | No | Yes | - | - | - | Resolved | Jun 30, 2022 | - | |
| May 1, 2022 | - | RPT | No | No | - | - | - | Resolved | Jun 14, 2022 | - | |
| Sep 1, 2020 | Sep 30, 2020 | MON | No | Yes | - | - | - | Resolved | Sep 30, 2020 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 30 ug/L | - | Archived | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.7 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.1 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.07 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.6 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.2 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.007 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 5 pCi/L | - | Archived | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.07 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 10 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 0.010 mg/L | - | Resolved | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.002 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.005 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2022 | MR | No | Yes | - | 15 pCi/L | - | Archived | Dec 31, 2022 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.075 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.1 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 0.1 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2020 | Dec 31, 2025 | MR | No | Yes | - | 1 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jul 1, 2019 | - | Other | No | No | - | - | - | Resolved | Oct 4, 2019 | - | |
| Jun 1, 2019 | Jun 30, 2019 | MON | No | Yes | - | - | - | Resolved | Jun 30, 2019 | - | |
| Jan 1, 2019 | Dec 31, 2019 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2019 | - | |
| Oct 1, 2018 | - | Other | No | No | - | - | - | Resolved | Oct 4, 2019 | - | |
| Aug 1, 2018 | Aug 31, 2018 | MON | No | Yes | - | - | - | Resolved | Aug 31, 2018 | - | |
| Jul 1, 2018 | - | Other | No | No | - | - | - | Resolved | Nov 15, 2018 | - | |
| Jun 1, 2018 | - | TT | Yes | No | - | - | - | Resolved | Jan 12, 2024 | - | |
| Feb 1, 2018 | Feb 28, 2018 | MON | No | Yes | - | - | - | Resolved | Feb 28, 2018 | - | |
| Jan 1, 2017 | Dec 31, 2019 | MR | No | Yes | - | 5 pCi/L | - | Archived | Dec 31, 2019 | - | |
| Dec 13, 2016 | - | RPT | No | No | - | - | - | Resolved | Dec 27, 2016 | - | |
| Nov 1, 2016 | Nov 30, 2016 | MON | No | Yes | - | - | - | Resolved | Nov 30, 2016 | - |
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.