Johnson City STP
Johnson City, TN · Washington County · Publicly Owned Treatment Works
- Average flow
- 5.49 MGD
- Design flow
- 16 MGD
- NPDES permit
- TN0024244
- Effective
- Permit expires
- September 2026
- Population served
- 66,934
- CWNS 2022
Johnson City STP is a publicly owned wastewater treatment works in Johnson City, Washington County, Tennessee treating an average of 5.49 million gallons per day against a permitted design capacity of 16 MGD, serving about 66,934 residents. Treatment on site includes clarifiers. It discharges under NPDES permit TN0024244 (effective), which expires in September 2026, with 23 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
- 23
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Johnson City STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Johnson City STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Tennessee
Johnson City · 3 mi away
3.07 MGD
Elizabethton · 4 mi away
1.8 MGD
Hampton · 10 mi away
0.004 MGD
Jonesboro · 11 mi away
0.69 MGD
Blountville · 14 mi away
0.0063 MGD
Erwin · 17 mi away
—
Kingsport · 17 mi away
0.0095 MGD
Roan Mountain · 19 mi away
0.003 MGD
Johnson City 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 February 26, 2025.