How many wastewater permits expire in Mississippi in 2028?

19 NPDES permits held by publicly owned wastewater treatment plants in Mississippi expire in 2028, covering a combined average flow of 12 MGD. The busiest month is Feb 2028 with 2 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 Mississippi in 2028?

West Biloxi Wastewater Treatment Plant in Biloxi, treating about 4.07 MGD under permit MS0030333, expiring Jun 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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Mississippi wastewater permits expiring in 2028

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

19 NPDES permits · 12 MGD combined average flow

19 publicly owned wastewater treatment plants in Mississippi hold NPDES permits that expire during 2028, issued by Mississippi Department of Environmental Quality. 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 (7)2027 (20)All Mississippi NPDES permits →

Publicly owned wastewater treatment plants in Mississippi 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)
Waynesboro POTW	Waynesboro	0.53	MS0024228	Jan 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	30
Diamondhead Water Sewer District	Diamondhead	0.75	MS0046078	Feb 2028	Clarifiers	0
Puckett POTW	Puckett	0.03	MS0055590	Feb 2028	Uncovered lagoons	198
Neshoba County	Philadelphia	0.09	MS0043478	Mar 2028	Clarifiers	58
Natchez POTW	Natchez	2.31	MS0024252	Mar 2028	Clarifiers, Uncovered lagoons	0
Clarksdale POTW	Clarksdale	1.31	MS0020311	Apr 2028	Clarifiers, Biogas silos	154
Standing Pine WWTF	Conehatta	0.03	MS0043494	May 2028	Uncovered lagoons	29
University Of Mississippi, The	University	—	MS0021873	May 2028	—	57
West Biloxi Wastewater Treatment Plant	Biloxi	4.07	MS0030333	Jun 2028	Clarifiers	1
Blue Mountain POTW	Blue Mountain	—	MS0025321	Jun 2028	Aerated lagoons, Uncovered lagoons	5
Ackerman POTW	Ackerman	—	MS0020575	Jul 2028	Aerated lagoons, Uncovered lagoons	48
Benoit POTW	Benoit	—	MS0020672	Jul 2028	Uncovered lagoons	14
Ecru POTW	Ecru	—	MS0035173	Aug 2028	Uncovered lagoons	6
Lucedale POTW	Lucedale	—	MS0044504	Aug 2028	Aerated lagoons, Uncovered lagoons	17
Batesville POTW	Batesville	0.68	MS0024627	Sep 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	9
Indianola POTW	Indianola	0.78	MS0024619	Oct 2028	—	719
Pearl River County Utility Authority, Neal Road POTW	Picayune	0.65	MS0061174	Nov 2028	Clarifiers, Carrousels / oxidation ditches	0
Ms/alcorn State University	Lorman	—	MS0027855	Nov 2028	Uncovered lagoons, Carrousels / oxidation ditches	388
Florence POTW	Florence	0.59	MS0025275	Dec 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	35

Mississippi 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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