Knob Creek Waste Water Plant
509 Austin Springs Road, Johnson City, TN 37601 · Washington County · Publicly Owned Treatment Works
- Average flow
- 3.26 MGD
- Design flow
- 4 MGD
- NPDES permit
- TN0024236
- Administratively continued
- 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 3.26 million gallons per day against a permitted design capacity of 4 MGD, serving about 14,154 residents. It discharges under NPDES permit TN0024236 (administratively continued), which expires in September 2026, with 15 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Knob Creek Waste Water Plant.
Available with a free Klarifi account
See the full treatment train at Knob Creek Waste Water Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Knob Creek Waste Water Plant in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 2
- latest Jul 2008
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Knob Creek Waste Water Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Knob Creek Waste Water Plant.
No verified contacts on file yet
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Nearby wastewater treatment plants in Tennessee
Johnson City · 3 mi away
5.94 MGD
Elizabethton · 6 mi away
1.93 MGD
Elizabethton · 8 mi away
0.007 MGD
Hampton · 13 mi away
0.0046 MGD
Blountville · 14 mi away
0.0055 MGD
Kingsport · 15 mi away
0.008 MGD
Erwin · 17 mi away
—
Roan Mountain · 21 mi away
0.0036 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 October 26, 2026; facility record last updated May 25, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms