Metaline STP
Wa-31, Metaline, WA 99152 · Pend Oreille County · Publicly Owned Treatment Works
- Average flow
- 0.0094 MGD
- Design flow
- 0.09 MGD
- NPDES permit
- WA0020699
- Administratively continued
- 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 0.0094 million gallons per day against a permitted design capacity of 0.09 MGD, serving about 183 residents. It discharges under NPDES permit WA0020699 (administratively continued), which expires in December 2023, with 11 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Metaline STP.
Available with a free Klarifi account
See the full treatment train at Metaline STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 11
- Effluent violations
- 9
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
0.00082 MGD
Ione · 7 mi away
0.1 MGD
Chewelah · 43 mi away
0.37 MGD
Newport · 49 mi away
0.17 MGD
Reardan · 85 mi away
0.06 MGD
Medical Lake · 89 mi away
0.38 MGD
Davenport · 89 mi away
0.16 MGD
Oroville · 93 mi away
0.18 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 October 26, 2026; facility record last updated November 8, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms