Leavenworth STP
1402 Commercial St, Leavenworth, WA 98826 · Chelan County · Publicly Owned Treatment Works
- Average flow
- 0.3 MGD
- 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 treating an average of 0.3 million gallons per day against a permitted design capacity of 2.52 MGD, serving about 2,383 residents. It discharges under NPDES permit WA0020974 (administratively continued), which expires in August 2020, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Leavenworth STP.
Available with a free Klarifi account
See the full treatment train at Leavenworth STP: structures, unit processes and planned upgrades, with exact unit counts.
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
0.42 MGD
Leavenworth · 15 mi away
0.02 MGD
Wenatchee · 20 mi away
2.86 MGD
Entiat · 21 mi away
0.1 MGD
Leavenworth · 23 mi away
0.008 MGD
Rock Island · 29 mi away
0.06 MGD
Cle Elum · 31 mi away
1.13 MGD
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 October 26, 2026; facility record last updated May 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms