Carbonado STP
Carbonado, WA · Pierce County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.19 MGD
- NPDES permit
- WA0020834
- Administratively continued
- Permit expires
- November 2022
- Population served
- 698
- CWNS 2022
Carbonado STP is a publicly owned wastewater treatment works in Carbonado, Pierce County, Washington, serving about 698 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit WA0020834 (administratively continued), which expires in November 2022, with 25 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 25
- Effluent violations
- 25
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Carbonado STP.
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Enumclaw · 8 mi away
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University Place · 26 mi away
17.07 MGD
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North Bend · 32 mi away
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Seattle · 32 mi away
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Snoqualmie · 34 mi away
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Carbonado 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 November 29, 2025.