Clean Water Act discharge permit · NPDES TN0066192
421 PLANT, Mountain City, TN: NPDES TN0066192 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 3Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
421 PLANT, held by Maymead Materials, Inc., holds NPDES permit TN0066192, which discharges to Watauga. EPA’s file records it issued October 19, 2018 and expiring October 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | 421 PLANT |
|---|---|
| Permittee as filed | Maymead Materials, Inc. |
| NPDES ID | TN0066192 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | October 19, 2018 |
| Expiration date | October 31, 2023 |
| Issuing agency | TDEC - DWR |
| Address | Mountain City, TN 37683 |
| Receiving water | Watauga |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Roane Creek Upper (HUC 060101030102) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 4Pollutants on file
- 3Under a numeric limit
- 4With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 8 | 120 | 0 | ||
| Flow, in conduit or thru treatment plant | 8 | 120 | 0 | ||
| Oil and grease visual | 0 | 120 | 0 | ||
| Solids, total suspended | 8 | 60 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES TN0066192.
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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 6, 2025 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| August 6, 2025 | Evidence of unauthorized discharge of pollutants from production area to a water of the U.S. | ST6 |
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, TN0066192.
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 TN0066192 there.
Nearby on the register
- Discharge permits in Mountain City
- Every permit record in Mountain 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 15, 2026.