King County South WWTP
Renton, WA · King County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WAR002511
- Effective
- Permit expires
- December 2029
- Population served
- 791,766
- CWNS 2022
King County South WWTP is a publicly owned wastewater treatment works in Renton, King County, Washington, serving about 791,766 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit WAR002511 (effective), which expires in December 2029, with 3 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
- 3
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for King County South WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at King County South WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Seattle · 6 mi away
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Port Orchard · 16 mi away
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Seattle · 16 mi away
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Bainbridge Island · 17 mi away
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Port Orchard · 18 mi away
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Snoqualmie · 20 mi away
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North Bend · 21 mi away
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Enumclaw · 22 mi away
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King County South 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 September 11, 2026; facility record last updated July 3, 2025.