Knob Creek Waste Water Plant
Johnson City, TN · Washington County · Publicly Owned Treatment Works
- Average flow
- 3.07 MGD
- Design flow
- 4 MGD
- NPDES permit
- TN0024236
- Effective
- Permit expires
- September 2026
- Population served
- 14,154
- CWNS 2022
Knob Creek Waste Water Plant is a publicly owned wastewater treatment works in Johnson City, Washington County, Tennessee treating an average of 3.07 million gallons per day against a permitted design capacity of 4 MGD, serving about 14,154 residents. Treatment on site includes carrousels / oxidation ditches. It discharges under NPDES permit TN0024236 (effective), which expires in September 2026, with 17 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Knob Creek Waste Water Plant.
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Nearby wastewater treatment plants in Tennessee
Johnson City · 3 mi away
5.49 MGD
Elizabethton · 6 mi away
1.8 MGD
Jonesboro · 10 mi away
0.69 MGD
Hampton · 13 mi away
0.004 MGD
Blountville · 14 mi away
0.0063 MGD
Kingsport · 15 mi away
0.0095 MGD
Erwin · 17 mi away
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Kingsport · 17 mi away
8.68 MGD
Knob Creek Waste Water Plant: 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.