How many wastewater permits expire in Tennessee in 2026?

16 NPDES permits held by publicly owned wastewater treatment plants in Tennessee expire in 2026, covering a combined average flow of 22 MGD. The busiest month is Nov 2026 with 6 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 2026?

City Of Franklin Wastewater Treatment Plant in Franklin, treating about 7.12 MGD under permit TN0028827, expiring Dec 2026.

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 2026

Name: Tennessee NPDES permits expiring in 2026
Creator: Klarifi
License: https://klarifi.io/terms-of-service

16 NPDES permits · 22 MGD combined average flow

16 publicly owned wastewater treatment plants in Tennessee hold NPDES permits that expire during 2026, 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:

2027 (41)2028 (47)All Tennessee NPDES permits →

Publicly owned wastewater treatment plants in Tennessee with NPDES permits expiring in 2026, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Hampton Elementary School	Hampton	0.004	TN0023698	May 2026	—	14
Wartburg STP	Wartburg	0.46	TN0028622	Jul 2026	Clarifiers, Carrousels / oxidation ditches	18
Johnson City STP	Johnson City	5.49	TN0024244	Sep 2026	Clarifiers	23
Knob Creek Waste Water Plant	Johnson City	3.07	TN0024236	Sep 2026	Carrousels / oxidation ditches	17
Benton STP	Benton	0.02	TN0067334	Oct 2026	—	7
Copperhill STP	Copperhill	—	TN0024449	Oct 2026	Clarifiers, Carrousels / oxidation ditches	0
Henderson STP- South Lagoon	Henderson	0.28	TN0064238	Nov 2026	Aerated lagoons, Uncovered lagoons	17
White Bluff STP (aka Water Authority Of Dickson County)	White Bluff	0.23	TN0020460	Nov 2026	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	7
Halls Lagoon	Halls	0.13	TN0057291	Nov 2026	Uncovered lagoons	4
Henderson STP- North Lagoon	Henderson	0.13	TN0064220	Nov 2026	Uncovered lagoons	16
Henderson STP- East Lagoon	Henderson	0.1	TN0026026	Nov 2026	Aerated lagoons	32
Roan Mountain State Park	Roan Mountain	0.0042	TN0074357	Nov 2026	—	51
City Of Franklin Wastewater Treatment Plant	Franklin	7.12	TN0028827	Dec 2026	Clarifiers, Carrousels / oxidation ditches, Biogas silos	44
Crossville STP	Crossville	2.61	TN0024996	Dec 2026	Clarifiers, Carrousels / oxidation ditches	26
Dickson STP	Dickson	2	TN0066958	Dec 2026	Clarifiers, Carrousels / oxidation ditches	21
Spring City New Lake Rd Plt	Spring City	0.31	TN0021261	Dec 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	14

Tennessee permit renewals in 2026: 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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