Stevens Pass STP
N Nanson Rd, Leavenworth, WA 98826 · Chelan County · Publicly Owned Treatment Works
- Average flow
- 0.008 MGD
- Design flow
- 0.11 MGD
- NPDES permit
- WA0029521
- Administratively continued
- Permit expires
- August 2013
- Population served
- 62
- CWNS 2022
Stevens Pass STP is a publicly owned wastewater treatment works in Leavenworth, Chelan County, Washington treating an average of 0.008 million gallons per day against a permitted design capacity of 0.11 MGD, serving about 62 residents. It discharges under NPDES permit WA0029521 (administratively continued), which expires in August 2013, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Stevens Pass STP.
Treatment structure data not yet analyzed for this facility.
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 Stevens Pass STP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Washington
Leavenworth · 17 mi away
0.02 MGD
Leavenworth · 23 mi away
0.3 MGD
Peshastin · 26 mi away
0.05 MGD
Cashmere · 34 mi away
0.42 MGD
Sultan · 35 mi away
0.59 MGD
Entiat · 41 mi away
0.1 MGD
Cle Elum · 41 mi away
1.13 MGD
Monroe · 42 mi away
1.79 MGD
Stevens Pass 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 August 20, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms