How many wastewater permits expire in Tennessee in 2028?

47 NPDES permits held by publicly owned wastewater treatment plants in Tennessee expire in 2028, covering a combined average flow of 47 MGD. The busiest month is Dec 2028 with 7 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in Tennessee in 2028?

Kingsport STP in Kingsport, treating about 8.68 MGD under permit TN0020095, expiring Dec 2028.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, technology and compliance data. Verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free trial.

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Tennessee wastewater permits expiring in 2028

Name: Tennessee NPDES permits expiring in 2028
Creator: Klarifi
License: https://klarifi.io/terms-of-service

47 NPDES permits · 47 MGD combined average flow

47 publicly owned wastewater treatment plants in Tennessee hold NPDES permits that expire during 2028, issued by Tennessee Department of Environment and Conservation. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.

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.

Other years:

2026 (16)2027 (41)All Tennessee NPDES permits →

Publicly owned wastewater treatment plants in Tennessee with NPDES permits expiring in 2028, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Collierville Northwest STP	Collierville	3.38	TN0078841	Jan 2028	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	3
Mcminnville Wastewater Plant	Mcminnville	1.21	TN0023591	Jan 2028	Clarifiers, Carrousels / oxidation ditches	4
New Johnsonville Lagoon	New Johnsonville	0.21	TN0062006	Feb 2028	Aerated lagoons, Uncovered lagoons	2
Acwa Airbase STP	Briceville	—	TN0074071	Feb 2028	—	58
West Knox Ud Melton Lake WWTP	Knoxville	3.94	TN0080721	Mar 2028	—	13
Maynardville STP	Maynardville	0.23	TN0022870	Mar 2028	Clarifiers	28
Decatur STP	Decatur	0.18	TN0058521	Mar 2028	Clarifiers	3
Benton-Decatur Counties Special Sewer District	Parsons	0.04	TN0078042	Mar 2028	Aerated lagoons	101
Briceville Elementary School	Briceville	0.001	TN0057860	Mar 2028	—	0
Waverly STP	Waverly	0.49	TN0078808	Apr 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Cooling towers	15
Lanier Elementary School	Maryville	0.0014	TN0062391	Apr 2028	—	0
Tennessee Department Of Corrections Dba Bledsoe County Correction Complex	Pikeville	—	TN0056626	Apr 2028	Clarifiers, Uncovered lagoons	5
Lewisburg STP	Lewisburg	2.1	TN0022888	May 2028	Clarifiers, Biogas silos	24
Clinton WWTP #1	Clinton	1.72	TN0026506	May 2028	Clarifiers, Biogas silos	0
Waynesboro STP	Waynesboro	0.3	TN0021695	May 2028	—	204
Memphis Regional Megasite	Stanton	0.2	TN0081906	May 2028	—	1
City Of Rossville	Rossville	—	TN0064092	May 2028	Aerated lagoons, Uncovered lagoons	4
Oliver Springs STP	Oliver Springs	0.4	TN0020885	Jun 2028	Clarifiers, Carrousels / oxidation ditches	76
Southwest Middle And Element	Kingsport	0.0095	TN0025151	Jun 2028	—	22
Mcewen STP Aka Mcewen WWTP	Mcewen	0.2	TN0021741	Jul 2028	Clarifiers	24
Tellico Plains STP	Tellico Plains	0.07	TN0024953	Jul 2028	Clarifiers, Carrousels / oxidation ditches	14
Bethesda Elementary School	Thompson'S Station	0.0057	TN0064475	Jul 2028	—	6
City Of Kingston	Kingston	0.44	TN0061701	Aug 2028	Clarifiers, Carrousels / oxidation ditches	15
Adamsville STP	Adamsville	—	TN0064785	Aug 2028	Aerated lagoons	7
Hallsdale-Powell U.D.-Melton Hill Lk	Knoxville	4.48	TN0078905	Sep 2028	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	44
City Of Savannah	Savannah	0.82	TN0061565	Sep 2028	Aerated lagoons, Uncovered lagoons	23
Linden Lagoon	Linden	0.22	TN0064394	Sep 2028	Aerated lagoons, Uncovered lagoons	258
Norris STP (norris Water Commission)	Norris	0.09	TN0020630	Sep 2028	—	97
City Of Moscow STP	Moscow	0.04	TN0021164	Sep 2028	—	9
City Of Columbia Wastewater Treatment Plant	Columbia	5.06	TN0056103	Oct 2028	Clarifiers	68
Lexington Utilities- Waste Water Treatment Plant	Lexington	1.13	TN0024341	Oct 2028	Clarifiers, Aerated lagoons	6
Tellico Area Services System - Niles Ferry STP	Vonore	0.5	TN0058238	Oct 2028	Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos	2
Madisonville STP	Madisonville	0.48	TN0025020	Oct 2028	—	13
City Of Rocky Top STP	Rocky Top	0.39	TN0025127	Oct 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	14
Centerville STP	Centerville	0.24	TN0024937	Oct 2028	Clarifiers, Aerated lagoons	7
Parsons STP	Parsons	0.36	TN0061727	Nov 2028	Aerated lagoons	86
Clifton STP #2	Clifton	0.2	TN0067423	Nov 2028	Aerated lagoons, Uncovered lagoons	7
Decaturville WWTP	Decaturville	0.06	TN0022985	Nov 2028	—	63
Grand Junction Oxidation Pond	Grand Junction	0.0029	TN0022560	Nov 2028	Uncovered lagoons	42
Camden Hcr Lagoon And Spray Irrigation	Camden	—	TN0064611	Nov 2028	Uncovered lagoons	79
Kingsport STP	Kingsport	8.68	TN0020095	Dec 2028	Clarifiers, Biogas silos, Biogas balloons	36
Oak Ridge STP	Oak Ridge	4.1	TN0024155	Dec 2028	Clarifiers	35
City Of Spring Hill STP	Spring Hill	3.65	TN0075868	Dec 2028	Clarifiers, Carrousels / oxidation ditches	42
Town Of Collierville	Collierville	1.16	TN0057461	Dec 2028	Clarifiers, Carrousels / oxidation ditches	5
Clifton Lagoon #1	Clifton	0.06	TN0061387	Dec 2028	Aerated lagoons	2
Buffalo WWTP	Hurricane Mills	0.04	TN0067865	Dec 2028	Aerated lagoons	19
Central Heights Elementary School	Blountville	0.0063	TN0059641	Dec 2028	—	2

Tennessee permit renewals in 2028: 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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