Carbonado STP
1005 Ap Tubbs Rd, Carbonado, WA 98323 · Pierce County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- 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 treating an average of 0.03 million gallons per day against a permitted design capacity of 0.19 MGD, serving about 698 residents. It discharges under NPDES permit WA0020834 (administratively continued), which expires in November 2022, with 22 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Carbonado STP.
Available with a free Klarifi account
See the full treatment train at Carbonado STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 22
- Effluent violations
- 22
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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—
Renton · 28 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 October 26, 2026; facility record last updated November 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms