Enumclaw STP
Enumclaw, WA · King County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0020575
- Effective
- Permit expires
- June 2030
- Population served
- 12,500
- CWNS 2022
Enumclaw STP is a publicly owned wastewater treatment works in Enumclaw, King County, Washington, serving about 12,500 residents. Treatment on site includes clarifiers. It discharges under NPDES permit WA0020575 (effective), which expires in June 2030, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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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
2 verified contacts for Enumclaw STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Enumclaw STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Carbonado · 8 mi away
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Orting · 11 mi away
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Renton · 22 mi away
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North Bend · 24 mi away
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Snoqualmie · 26 mi away
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Eatonville · 26 mi away
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Seattle · 27 mi away
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University Place · 27 mi away
17.07 MGD
Enumclaw 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 August 14, 2026.