Metaline STP
Metaline, WA · Pend Oreille County · Publicly Owned Treatment Works
- Average flow
- 0.02 MGD
- Design flow
- 0.09 MGD
- NPDES permit
- WA0020699
- Effective
- Permit expires
- December 2023
- Population served
- 183
- CWNS 2022
Metaline STP is a publicly owned wastewater treatment works in Metaline, Pend Oreille County, Washington treating an average of 0.02 million gallons per day against a permitted design capacity of 0.09 MGD, serving about 183 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit WA0020699 (effective), which expires in December 2023, with 10 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 10
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Metaline STP.
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Nearby wastewater treatment plants in Washington
Metaline Falls · 3 mi away
0.001 MGD
Ione · 7 mi away
—
Colville · 32 mi away
0.62 MGD
Chewelah · 43 mi away
0.19 MGD
Newport · 49 mi away
—
Spokane · 80 mi away
31.72 MGD
Reardan · 85 mi away
0.03 MGD
Medical Lake · 89 mi away
0.27 MGD
Metaline STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 8, 2025.