Mountain City WWTP
Mountain City, TN · Johnson County · Publicly Owned Treatment Works
- Average flow
- 0.61 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- TN0024945
- Effective
- Permit expires
- July 2031
- Population served
- 2,062
- CWNS 2022
Mountain City WWTP is a publicly owned wastewater treatment works in Mountain City, Johnson County, Tennessee treating an average of 0.61 million gallons per day against a permitted design capacity of 1.2 MGD, serving about 2,062 residents. Treatment on site includes clarifiers. It discharges under NPDES permit TN0024945 (effective), which expires in July 2031, with 67 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
- 67
- Effluent violations
- 59
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Mountain City WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Mountain City WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Tennessee
Roan Mountain · 22 mi away
0.003 MGD
Hampton · 23 mi away
0.004 MGD
Roan Mountain · 25 mi away
0.0042 MGD
Elizabethton · 25 mi away
1.8 MGD
Johnson City · 29 mi away
5.49 MGD
Johnson City · 31 mi away
3.07 MGD
Blountville · 32 mi away
0.0063 MGD
Jonesboro · 39 mi away
0.69 MGD
Mountain City 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 May 25, 2025.