Leavenworth STP
Leavenworth, WA · Chelan County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 2.52 MGD
- NPDES permit
- WA0020974
- Administratively continued
- Permit expires
- August 2020
- Population served
- 2,383
- CWNS 2022
Leavenworth STP is a publicly owned wastewater treatment works in Leavenworth, Chelan County, Washington, serving about 2,383 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit WA0020974 (administratively continued), which expires in August 2020, with 0 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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Leavenworth STP.
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Nearby wastewater treatment plants in Washington
Peshastin · 3 mi away
0.05 MGD
Cashmere · 11 mi away
0.39 MGD
Leavenworth · 15 mi away
—
Wenatchee · 20 mi away
—
Entiat · 21 mi away
—
Rock Island · 29 mi away
0.06 MGD
Cle Elum · 31 mi away
—
Chelan · 34 mi away
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Leavenworth 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 May 29, 2025.