Clean Water Act discharge permit · NPDES TN0024236
JOHNSON CITY KNOB CREEK WWTP, Johnson City, TN: NPDES TN0024236 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 17Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
JOHNSON CITY KNOB CREEK WWTP, held by Johnson City, holds NPDES permit TN0024236, which discharges to Watauga. EPA’s file records it issued September 1, 2016 and expiring August 31, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | JOHNSON CITY KNOB CREEK WWTP |
|---|---|
| Permittee as filed | Johnson City |
| NPDES ID | TN0024236 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 1, 2016 |
| Expiration date | August 31, 2021 |
| Issuing agency | TDEC - DWR |
| Address | Johnson City, TN 37601 |
| Receiving water | Watauga |
| Subwatershed | Boone Lake (HUC 060101030508) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 20Pollutants on file
- 17Under a numeric limit
- 13With a violation of any kind
- 7With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| SSO, Dry Weather | 0 | 12 | 12 | February 28, 2026 | 2,147,483,650% over the limit |
| SSO, Wet Weather | 0 | 3 | 3 | July 31, 2026 | 2,147,483,650% over the limit |
| Solids, total suspended | 7 | 2 | 1 | December 31, 2022 | 10% over the limit |
| E. coli, MTEC-MF | 2 | 1 | 1 | November 30, 2013 | 108% over the limit |
| Oxygen, dissolved [DO] | 1 | 1 | 1 | April 30, 2011 | 2% over the limit |
| Solids, settleable | 1 | 1 | 1 | March 31, 2002 | 500% over the limit |
| Coliform, fecal MF, MFC broth, 44.5 C | 0 | 1 | 1 | August 31, 2002 | 210% over the limit |
| Nitrogen, total [as N] | 1 | 6 | 0 | ||
| Phosphorus, total [as P] | 1 | 6 | 0 | ||
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 3 | 0 | ||
| IC25 Static Renewal 7 Day Chronic Chrpimephales | 1 | 3 | 0 | ||
| Solids, suspended percent removal | 2 | 2 | 0 | ||
| Carbonaceous oxygen demand, % removal | 2 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 10 | 0 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 7 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Overflows | 2 | 0 | 0 | ||
| Chlorine, total residual | 1 | 0 | 0 | ||
| Bypass valve | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES TN0024236.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, TN0024236.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TN0024236 there.
Nearby on the register
- Discharge permits in Johnson City
- Every permit record in Johnson City, A to Z
- Discharge permits in Tennessee
- Every permit record in Tennessee, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.