Ione STP
Ione, WA · Pend Oreille County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.65 MGD
- NPDES permit
- WA0045373
- Administratively continued
- Permit expires
- May 2013
- Population served
- 657
- CWNS 2022
Ione STP is a publicly owned wastewater treatment works in Ione, Pend Oreille County, Washington, serving about 657 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit WA0045373 (administratively continued), which expires in May 2013, with 13 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 13
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Ione STP.
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Nearby wastewater treatment plants in Washington
Metaline Falls · 5 mi away
0.001 MGD
Metaline · 7 mi away
0.02 MGD
Colville · 27 mi away
0.62 MGD
Chewelah · 36 mi away
0.19 MGD
Newport · 42 mi away
—
Spokane · 73 mi away
31.72 MGD
Reardan · 78 mi away
0.03 MGD
Medical Lake · 81 mi away
0.27 MGD
Ione 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.