Sultan WWTP
203 W Stevens Ave, Sultan, WA 98294 · Snohomish County · Publicly Owned Treatment Works
- Average flow
- 0.59 MGD
- Design flow
- —
- NPDES permit
- WA0023302
- Administratively continued
- Permit expires
- March 2023
- Population served
- 5,329
- CWNS 2022
Sultan WWTP is a publicly owned wastewater treatment works in Sultan, Snohomish County, Washington treating an average of 0.59 million gallons per day, serving about 5,329 residents. It discharges under NPDES permit WA0023302 (administratively continued), which expires in March 2023, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Sultan WWTP.
Available with a free Klarifi account
See the full treatment train at Sultan WWTP: 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 Sultan WWTP.
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Nearby wastewater treatment plants in Washington
Monroe · 7 mi away
1.79 MGD
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Edmonds · 23 mi away
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Edmonds · 24 mi away
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Marysville · 25 mi away
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Seattle · 31 mi away
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Kingston · 33 mi away
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Renton · 33 mi away
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Sultan WWTP: 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 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms