Who issues NPDES permits in Tennessee?

Tennessee Department of Environment and Conservation issues and enforces NPDES permits for wastewater discharges in Tennessee. Klarifi tracks 227 permits held by publicly owned treatment plants in the state.

How many NPDES permits in Tennessee are expired or administratively continued?

7 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 0 are recorded as expired, out of 227 permits tracked. 218 are effective.

How many Tennessee wastewater permits come up for renewal soon?

16 in 2026, 41 in 2027 and 47 in 2028. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in Tennessee

Name: NPDES permits held by wastewater treatment plants in Tennessee
Creator: Klarifi
License: https://klarifi.io/terms-of-service

227 permits held by publicly owned wastewater treatment plants · issued by TDEC

Effective

218

Administratively continued

Expired

Total tracked

227

Tennessee Department of Environment and Conservation (TDEC) runs the NPDES program in Tennessee under delegation from EPA Region 4, issuing and enforcing the discharge permits listed here. Klarifi tracks 227 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.

Permit renewals by year

2026: 16 permits →2027: 41 permits →2028: 47 permits →

2029: 51 permits

2030: 50 permits

2031: 15 permits

Largest permit holders in Tennessee

The 25 largest publicly owned wastewater treatment plants in Tennessee by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
Metro Central Wastewater Treatment Plant	Nashville	88.2	—	TNL020575	Effective	Dec 2030	62
Whites Creek Wastewater Treatment Plant	Nashville	21.51	37.5	TN0024970	Administratively continued	Oct 2025	39
Moccasin Bend Wastewater Treatment Plant	Chattanooga	36.67	—	TNR053775	Effective	Jun 2030	53
Oak Ridge STP	Oak Ridge	4.1	30	TN0024155	Effective	Dec 2028	35
Nashville Dry Creek STP	Madison	12.69	24	TN0020648	Administratively continued	Oct 2025	34
Cleveland Utilities Wastewater Treatment Plant	Charleston	6.59	21.6	TN0024121	Effective	Apr 2027	43
City Of Franklin Wastewater Treatment Plant	Franklin	7.12	16	TN0028827	Effective	Dec 2026	44
Johnson City STP	Johnson City	5.49	16	TN0024244	Effective	Sep 2026	23
City Of Cookeville Department Of Water Quality Control (wwtp)	Cookeville	9.62	14	TN0024198	Effective	Jun 2027	27
Kingsport STP	Kingsport	8.68	12.4	TN0020095	Effective	Dec 2028	36
City Of Columbia Wastewater Treatment Plant	Columbia	5.06	10	TN0056103	Effective	Oct 2028	68
Harpeth Valley Utility District STP	Nashville	4.76	10	TN0074748	Effective	Feb 2030	4
West Knox Ud Melton Lake WWTP	Knoxville	3.94	10	TN0080721	Effective	Mar 2028	13
Hallsdale-Powell U.D.-Melton Hill Lk	Knoxville	4.48	9.7	TN0078905	Effective	Sep 2028	44
Dyersburg STP	Dyersburg	3.12	9.45	TN0023477	Effective	Dec 2027	20
Jackson Energy Auth- Middle Fk	Jackson	2.45	8	TN0075876	Effective	May 2027	6
Turkey Creek WWTP (morristown Stp)	Morristown	4.87	7.5	TN0023507	Effective	Oct 2029	22
Denzil Bowman Wastewater Treatment Plant (greeneville Stp)	Greeneville	3.34	7	TN0021229	Effective	Oct 2030	28
Shelbyville Wastewater Treatment Plant	Shelbyville	3.04	6.5	TN0024180	Effective	Jan 2029	22
Collierville Northwest STP	Collierville	3.38	6	TN0078841	Effective	Jan 2028	3
City Of Spring Hill STP	Spring Hill	3.65	5	TN0075868	Effective	Dec 2028	42
Humboldt Utilities Authority	Humboldt	3.04	5	TN0062588	Effective	Aug 2027	7
Tullahoma STP	Tullahoma	2.2	5	TN0023469	Effective	Jul 2027	6
Union City STP Aka A.L. Strub Wastewater Treatment Plant	Union City	2.2	5	TN0021580	Effective	Oct 2030	1
Sevierville (mccroskey Island) STP	Sevierville	5.32	4.8	TN0063959	Effective	Apr 2030	115

All 227 plants in Tennessee →

NPDES permits in Tennessee: 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.

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