How many wastewater permits expire in Tennessee in 2028?

48 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 Oct 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?

Hallsdale-Powell U.D.-Melton Hill Lk in Knoxville, treating about 6.35 MGD under permit TN0078905, expiring Sep 2028.

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

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

Try for free Log in

Tennessee wastewater permits expiring in 2028

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

48 NPDES permits · 47 MGD combined average flow

48 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 (43)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	Violations (3y)
Collierville Northwest STP	Collierville	3.64	TN0078841	Jan 2028	4
Mcminnville Wastewater Plant	Mcminnville	1.63	TN0023591	Jan 2028	5
New Johnsonville Lagoon	New Johnsonville	0.36	TN0062006	Feb 2028	2
Acwa Airbase STP	Briceville	—	TN0074071	Feb 2028	61
West Knox Ud Melton Lake WWTP	Knoxville	4.07	TN0080721	Mar 2028	13
Maynardville STP	Maynardville	0.26	TN0022870	Mar 2028	29
Decatur STP	Decatur	0.19	TN0058521	Mar 2028	3
Benton-Decatur Counties Special Sewer District	Parsons	0.07	TN0078042	Mar 2028	101
Briceville Elementary School	Briceville	0.00078	TN0057860	Mar 2028	0
Waverly STP	Waverly	0.91	TN0078808	Apr 2028	15
Tennessee Department Of Corrections Dba Bledsoe County Correction Complex	Pikeville	0.08	TN0056626	Apr 2028	4
Lanier Elementary School	Maryville	—	TN0062391	Apr 2028	0
Clinton WWTP #1	Clinton	2.1	TN0026506	May 2028	3
Lewisburg STP	Lewisburg	2.07	TN0022888	May 2028	22
City Of Rossville	Rossville	0.46	TN0064092	May 2028	4
Waynesboro STP	Waynesboro	0.43	TN0021695	May 2028	205
Memphis Regional Megasite	Stanton	0.17	TN0081906	May 2028	1
Oliver Springs STP	Oliver Springs	0.56	TN0020885	Jun 2028	76
Southwest Middle And Element	Kingsport	0.008	TN0025151	Jun 2028	21
Mcewen STP Aka Mcewen WWTP	Mcewen	0.34	TN0021741	Jul 2028	25
Tellico Plains STP	Tellico Plains	0.09	TN0024953	Jul 2028	13
Bethesda Elementary School	Thompson'S Station	0.0069	TN0064475	Jul 2028	6
City Of Kingston	Kingston	0.52	TN0061701	Aug 2028	15
Adamsville STP	Adamsville	—	TN0064785	Aug 2028	7
Hallsdale-Powell U.D.-Melton Hill Lk	Knoxville	6.35	TN0078905	Sep 2028	44
City Of Savannah	Savannah	1.44	TN0061565	Sep 2028	23
Linden Lagoon	Linden	0.24	TN0064394	Sep 2028	260
Norris STP (norris Water Commission)	Norris	0.11	TN0020630	Sep 2028	97
City Of Moscow STP	Moscow	—	TN0021164	Sep 2028	9
City Of Columbia Wastewater Treatment Plant	Columbia	5.33	TN0056103	Oct 2028	68
Lexington Utilities- Waste Water Treatment Plant	Lexington	1.13	TN0024341	Oct 2028	7
Tellico Area Services System - Niles Ferry STP	Vonore	0.56	TN0058238	Oct 2028	2
Madisonville STP	Madisonville	0.54	TN0025020	Oct 2028	16
City Of Rocky Top STP	Rocky Top	0.54	TN0025127	Oct 2028	15
Centerville STP	Centerville	0.27	TN0024937	Oct 2028	7
Hallsdale-Powell Raccoon Valley STP	Heiskell	0.07	TN0059323	Oct 2028	2
Camden Hcr Lagoon And Spray Irrigation	Camden	1.42	TN0064611	Nov 2028	79
Parsons STP	Parsons	0.43	TN0061727	Nov 2028	88
Clifton STP #2	Clifton	0.2	TN0067423	Nov 2028	7
Decaturville WWTP	Decaturville	0.16	TN0022985	Nov 2028	68
Grand Junction Oxidation Pond	Grand Junction	0.05	TN0022560	Nov 2028	38
Oak Ridge STP	Oak Ridge	4.37	TN0024155	Dec 2028	35
City Of Spring Hill STP	Spring Hill	3.83	TN0075868	Dec 2028	41
Town Of Collierville	Collierville	1.48	TN0057461	Dec 2028	5
Tellico Reservoir Development Agency	Vonore	0.31	TN0059897	Dec 2028	42
Clifton Lagoon #1	Clifton	0.08	TN0061387	Dec 2028	2
Buffalo WWTP	Hurricane Mills	0.08	TN0067865	Dec 2028	19
Central Heights Elementary School	Blountville	0.0055	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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Filter press · FOG · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “NPDES permits expiring in 2028: Tennessee wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/tennessee/permits-expiring/2028

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free