Cowan STP
Cowan, TN · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.4 MGD
- NPDES permit
- TN0021644
- Effective
- Permit expires
- January 2027
- Population served
- 1,477
- CWNS 2022
Cowan STP is a publicly owned wastewater treatment works in Cowan, Franklin County, Tennessee treating an average of 0.09 million gallons per day against a permitted design capacity of 0.4 MGD, serving about 1,477 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit TN0021644 (effective), which expires in January 2027, with 0 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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Cowan STP.
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Nearby wastewater treatment plants in Tennessee
Monteagle · 10 mi away
0.15 MGD
Tullahoma · 12 mi away
0.02 MGD
Tullahoma · 17 mi away
2.2 MGD
Lynchburg · 23 mi away
0.11 MGD
Jasper · 23 mi away
0.15 MGD
Manchester · 23 mi away
2.15 MGD
Jasper · 28 mi away
0.0032 MGD
Wartrace · 31 mi away
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Cowan 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 19, 2025.