Hamilton County Wastewater Treatment Authority, Signal Mountain STP
Chattanooga, TN · Hamilton County · Publicly Owned Treatment Works
- Average flow
- 0.2 MGD
- Design flow
- 0.4 MGD
- NPDES permit
- TN0021211
- Effective
- Permit expires
- March 2029
- Population served
- 8,411
- CWNS 2022
Hamilton County Wastewater Treatment Authority, Signal Mountain STP is a publicly owned wastewater treatment works in Chattanooga, Hamilton County, Tennessee treating an average of 0.2 million gallons per day against a permitted design capacity of 0.4 MGD, serving about 8,411 residents. Treatment on site includes clarifiers. It discharges under NPDES permit TN0021211 (effective), which expires in March 2029, with 123 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
- 123
- Effluent violations
- 121
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Hamilton County Wastewater Treatment Authority, Signal Mountain STP.
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Charleston · 35 mi away
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Calhoun · 37 mi away
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Hamilton County Wastewater Treatment Authority, Signal Mountain 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.