How many wastewater permits expire in Ohio in 2027?

189 NPDES permits held by publicly owned wastewater treatment plants in Ohio expire in 2027, covering a combined average flow of 195 MGD. The busiest month is Oct 2027 with 24 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 Ohio in 2027?

City Of Dayton Water Reclamation Facility (0857100983) in Dayton, treating about 51.69 MGD under permit OH0024881, expiring Apr 2027.

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.

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Ohio wastewater permits expiring in 2027

Name: Ohio NPDES permits expiring in 2027
Creator: Klarifi
License: https://klarifi.io/terms-of-service

189 NPDES permits · 195 MGD combined average flow

189 publicly owned wastewater treatment plants in Ohio hold NPDES permits that expire during 2027, issued by Ohio Environmental Protection Agency. 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 (108)2028 (170)All Ohio NPDES permits →

Publicly owned wastewater treatment plants in Ohio with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Trumbull Mosquito Creek WWTP	Warren	4.55	OH0043401	Jan 2027	41
Bellefontaine WWTP	Bellefontaine	2.68	OH0024066	Jan 2027	25
Toronto WWTP	Toronto	0.5	OH0020214	Jan 2027	21
Stark Co Magnolia WWTP	Canton	0.25	OH0091847	Jan 2027	0
Mt Victory WWTP	Mount Victory	0.25	OH0078271	Jan 2027	10
Ashtabula Co Coffee Creek WWTP	Austinburg	0.11	OH0098469	Jan 2027	137
Odot / Rest Area 3-36-Odot Rest Area 3-36	Ashland	0.0084	OH0088269	Jan 2027	23
Tar Hollow State Park	Laurelville	0.0024	OH0037940	Jan 2027	1
North Regional Wastewater Treatment Plan (0857143037)	Dayton	11.24	OH0049646	Feb 2027	49
Miamisburg Water Reclamation Facility	Miamisburg	3.13	OH0026492	Feb 2027	0
Leetonia WWTP	Leetonia	0.31	OH0021652	Feb 2027	1
Woodbran Realty WWTP	Woodmere	0.25	OH0044555	Feb 2027	7
Felicity WWTP	Felicity	0.17	OH0024597	Feb 2027	2
Mill Creek Estates WWTP	Marysville	0.06	OH0070815	Feb 2027	0
Stonelick State Park Campgrounds WWTP	Pleasant Plain	0.03	OH0092649	Feb 2027	0
Vienna WWTP No 1	Vienna	0.02	OH0097993	Feb 2027	4
Wintergreen Hills Subdiv WWTP	Circleville	0.01	OH0036251	Feb 2027	20
Knollwood Village Subdiv WWTP	Circleville	0.01	OH0036242	Feb 2027	4
Hoover Woods WWTP	Galena	0.0095	OH0101877	Feb 2027	32
Fox Den WWTP	Warren	0.0092	OH0112216	Feb 2027	1
Willow Hills WWTP	Chesterland	0.0076	OH0028894	Feb 2027	7
Hammer Heinsman WWTP	Tiffin	0.0052	OH0039268	Feb 2027	0
Odnr Beach Area W Branch Sp	Ravenna	0.005	OH0037893	Feb 2027	0
Ranchwood Community	Bucyrus	0.0041	OH0125741	Feb 2027	0
Green Hills Coach Park Ltd	Kenton	0.001	OH0126918	Feb 2027	66
Gary L Kron Water Reclamation Facility	Mentor	14.71	OH0043559	Mar 2027	30
Polk Run WWTP	Loveland	5.12	OH0020419	Mar 2027	4
Fairfield Co Tussing Road WWTP	Lancaster	2.2	OH0054305	Mar 2027	30
Waynesville Regional WWTP	Waynesville	0.62	OH0020753	Mar 2027	23
Hamden WWTP	Hamden	0.27	OH0134945	Mar 2027	16
Clermont Co Commissioners Arrowhead Park STP	Loveland	0.07	OH0049310	Mar 2027	1
Belle Vernon WWTP	Russell	0.04	OH0028827	Mar 2027	2
Dee Mar Allotment WWTP	Navarre	0.04	OH0035831	Mar 2027	0
Kimberly Estates WWTP	Newbury	0.02	OH0028835	Mar 2027	0
Wenhaven WWTP	Russell	0.0084	OH0028886	Mar 2027	0
Sugar Grove WWTP	Sugar Grove	—	OH0020401	Mar 2027	0
City Of Dayton Water Reclamation Facility (0857100983)	Dayton	51.69	OH0024881	Apr 2027	17
Bowling Green	Bowling Green	5	OH0024139	Apr 2027	14
Millersburg WWTP	Millersburg	0.72	OH0020168	Apr 2027	8
East Palestine WWTP	East Palestine	0.7	OH0021784	Apr 2027	8
Killbuck WWTP	Killbuck	0.29	OH0025933	Apr 2027	1
Frazeysburg WWTP	Frazeysburg	0.08	OH0020800	Apr 2027	1
Bloomdale WWTP	Bloomdale	0.06	OH0095176	Apr 2027	10
Mast Estates WWTP	Elida	0.009	OH0037389	Apr 2027	0
Pike Lake State Park WWTP	Bainbridge	0.0029	OH0037699	Apr 2027	0
Mcconnelsvilles State Route 78 Package Sewer Plt	Mcconnelsville	0.0018	OH0107905	Apr 2027	11
Troy WWTP	Troy	5.28	OH0027758	May 2027	10
City Of Salem - Wastewater Plant	Salem	2.82	OH0027324	May 2027	5
Creston STP	Creston	0.27	OH0021172	May 2027	13
West Alexandria WWTP	W Alexandria	0.18	OH0021598	May 2027	14
New Madison STP	New Madison	0.09	OH0040584	May 2027	3
Pleasant View Acres WWTP	Mount Vernon	0.02	OH0081671	May 2027	2
Sparta WWTP	Sparta	0.02	OH0130788	May 2027	1
Country Lawn Ctr For Rehab Nursing Home	Navarre	0.01	OH0129461	May 2027	0
Louisville WWTP	Louisville	1.8	OH0026182	Jun 2027	1
Rockford STP	Rockford	0.29	OH0022446	Jun 2027	12
Dalton WWTP	Dalton	0.24	OH0021687	Jun 2027	32
Ottoville WWTP	Ottoville	0.19	OH0021709	Jun 2027	21
Syracuse-Racine Regional Sd WWTP	Racine	0.13	OH0050661	Jun 2027	0
Orwell WWTP	Orwell	0.13	OH0026913	Jun 2027	42
Put-In-Bay STP	Put In Bay	0.09	OH0022322	Jun 2027	1
Flat Branch WWTP	East Liberty	0.05	OH0047953	Jun 2027	5
Walnut Heights Subdiv	Circleville	0.02	OH0101834	Jun 2027	17
Ursuline College	Pepper Pike	0.01	OH0044784	Jun 2027	12
Gates Mills WWTP	Gates Mills	0.005	OH0128643	Jun 2027	1
Forest Lane Subdiv	Wapakoneta	0.0034	OH0095265	Jun 2027	2
Bigham'S Apartments WWTP	Amanda	0.001	OH0124010	Jun 2027	1
Bidwell Porter WWTP	Bidwell	—	OH0124664	Jun 2027	0
Alliance Water Tr. Plant And Wastewater Tr. Plant	Alliance	5.28	OH0023868	Jul 2027	0
Mcfarland Creek WWTP	Bainbridge	1.42	OH0043494	Jul 2027	361
Deshler WWTP	Deshler	0.45	OH0022471	Jul 2027	0
Atwood Regional W & Sd	Dellroy	0.41	OH0050253	Jul 2027	7
Metamora WWTP	Metamora	0.32	OH0058408	Jul 2027	4
Farmersville WWTP	Farmersville	0.2	OH0020770	Jul 2027	3
Stryker STP	Stryker	0.02	OH0022497	Jul 2027	4
Lakeland Woods Sd	Bryan	0.02	OH0079103	Jul 2027	4
Rolin Acres Subdiv WWTP	Greenville	0.01	OH0085561	Jul 2027	4
Cloverleaf Jr & Sr Hs	Lodi	0.01	OH0126217	Jul 2027	11
Rock Hill Local School District	Ironton	0.0098	OH0127761	Jul 2027	0
Surrey Downs WWTP	Russell	0.0072	OH0028878	Jul 2027	3
Westwood Acres Subdiv	Fremont	0.0067	OH0036501	Jul 2027	6
Rolling Acres WWTP	Hillsboro	0.006	OH0041165	Jul 2027	8
Portage Point Condos & Oak Harbor Golf Club	Oak Harbor	0.0048	OH0125661	Jul 2027	11
Fostoria City Dump	Fostoria	4.28	OH0052744	Aug 2027	4
Piqua WWTP	Piqua	3.72	OH0027049	Aug 2027	3
Taylor Creek WWTP	Cleves	3.21	OH0040983	Aug 2027	11
City Of Vermilion WPCF	Vermilion	1.37	OH0023612	Aug 2027	40
Cridersville Village	Cridersville	0.34	OH0020222	Aug 2027	6
Aberdeen WWTP	Aberdeen	0.22	OH0023825	Aug 2027	38
Nws Williamsburg On The River WWTP	Bowling Green	0.03	OH0079201	Aug 2027	5
Williams Co/hillside Country Living WWTP	Bryan	0.02	OH0079090	Aug 2027	4
Hickory Hills WWTP	Kirtland	0.02	OH0036803	Aug 2027	14
Lake Moor Estates Subdiv	Logan	0.02	OH0050237	Aug 2027	3
Fairlane Estates WWTP & Sewers	Suffield	0.02	OH0038709	Aug 2027	0
Sunshine Acres WWTP & Sewer System	Painesville	0.01	OH0039021	Aug 2027	0
Shawnee State Park Campground WWTP	Portsmouth	0.0064	OH0037885	Aug 2027	2
Odot Park No 1-30	Carey	0.0012	OH0078611	Aug 2027	5
Odot Dist 1 Park No 1-29	Carey	0.0012	OH0078603	Aug 2027	4
Peachgrove Townhouse Condos	Cincinnati	0.0011	OH0118028	Aug 2027	27
Aurora Central WWTP	Aurora	0.91	OH0021903	Sep 2027	1
Plain City WWTP	Plain City	0.83	OH0027057	Sep 2027	158
Swanton WRRF	Swanton	0.46	OH0020524	Sep 2027	43
Hartville WWTP	Hartville	0.32	OH0020923	Sep 2027	2
Ashtabula Co Holiday Camplands WWTP	Andover	0.29	OH0043770	Sep 2027	72
Malvern Water Pollution Control Center	Malvern	0.24	OH0051144	Sep 2027	0
Fredericktown Village-Fredericktown WTP	Fredericktown	0.21	OH0025283	Sep 2027	0
Atwater WWTP	Ravenna	0.08	OH0038792	Sep 2027	6
Laura WWTP	Laura	0.06	OH0112704	Sep 2027	0
Springwood Lake Camp Club WWTP	Navarre	0.05	OH0128503	Sep 2027	28
South Webster WWTP	South Webster	0.04	OH0041416	Sep 2027	93
Bazetta WWTP	Cortland	0.04	OH0092550	Sep 2027	33
Chesterville WWTP	Chesterville	0.04	OH0124478	Sep 2027	14
Skyridge Apartment Homes	Cincinnati	0.02	OH0071803	Sep 2027	2
Latty WWTP	Latty	0.02	OH0058246	Sep 2027	27
Salt Fork Sp Lodge & Cabin WWTP	Lore City	0.01	OH0037851	Sep 2027	0
Honey Creek Village	Tiffin	0.0081	OH0122327	Sep 2027	4
Salt Fork Sp Campground WWTP	Lore City	0.0079	OH0037834	Sep 2027	0
Beverly Hills Subdiv	Wapakoneta	0.0048	OH0078760	Sep 2027	0
Odot Rest Area 5-27	Old Washington	0.003	OH0076791	Sep 2027	10
Lhs Maumee Youth Center	Liberty Center	0.0026	OH0052566	Sep 2027	5
Salt Fork Sp Marina WWTP	Lore City	0.0024	OH0090999	Sep 2027	0
Pymatuning Adventure Resort Llc	Williamsfield	0.0016	OH0125989	Sep 2027	3
French Creek WWTP	North Ridgeville	6.82	OH0044512	Oct 2027	14
Minster WWTP	Minster	1.77	OH0026573	Oct 2027	19
Mingo Junction STP	Mingo Junction	0.64	OH0026565	Oct 2027	8
Shreve WWTP	Shreve	0.28	OH0045373	Oct 2027	8
Anna STP	Anna	0.27	OH0023370	Oct 2027	30
Danville WWTP	Danville	0.25	OH0024872	Oct 2027	15
Haskins WWTP	Haskins	0.15	OH0021873	Oct 2027	9
Republic WWTP	Republic	0.12	OH0130249	Oct 2027	0
Nettle Lake Area STP	Pioneer	0.08	OH0053376	Oct 2027	0
Liberty Center WWTP	Liberty Center	0.07	OH0029289	Oct 2027	2
Grandview Estates Sd 2a	Marion	0.05	OH0036765	Oct 2027	27
Sycamore WWTP	Sycamore	0.04	OH0021989	Oct 2027	16
Scarsdale WWTP	Chagrin Falls	0.03	OH0028916	Oct 2027	0
Hidden Acres Campground Inc	West Salem	0.02	OH0138665	Oct 2027	7
Norlick Place WWTP	Bryan	0.02	OH0058831	Oct 2027	34
Harmony Subdiv Sd 5b	Marion	0.02	OH0078387	Oct 2027	29
Country Acres Golf Club	Ottawa	0.01	OH0079057	Oct 2027	11
Western Reserve Elem Jr & Sr Hs	Collins	0.0069	OH0125776	Oct 2027	22
Bumford Road WWTP Sd 6a	Marion	0.0029	OH0036757	Oct 2027	2
Eighty-Seven & Elm	Newbury	0.00035	OH0130010	Oct 2027	0
Orlandos Supermarket Center	North Kingsville	0.0003	OH0129101	Oct 2027	0
Vermilion Vfw Post 7576	Vermilion	0.0002	OH0130117	Oct 2027	2
Holgate WWTP	Holgate	—	OH0021865	Oct 2027	4
Rawson WWTP	Rawson	—	OH0047791	Oct 2027	0
Black River Wastewater Treatment Plant	Lorain	12.3	OH0026093	Nov 2027	6
Indian Lake Regional WWTP	Russells Point	2.27	OH0036641	Nov 2027	1
Montpelier WWTP	Montpelier	0.64	OH0021831	Nov 2027	1
West Unity STP	West Unity	0.33	OH0020303	Nov 2027	21
Millersport STP	Millersport	0.27	OH0026531	Nov 2027	4
Twin Lakes WWTP	Kent	0.26	OH0038580	Nov 2027	0
Hamler WWTP	Hamler	0.18	OH0021105	Nov 2027	60
Edon WWTP	Edon	0.06	OH0095141	Nov 2027	20
Mcguffey STP	Mcguffey	0.04	OH0026271	Nov 2027	119
Evansport WWTP	Evansport	0.03	OH0053694	Nov 2027	0
Meadowbrook Mhp	Lockbourne	0.02	OH0113638	Nov 2027	16
Lafayette WWTP	Lafayette	0.02	OH0053155	Nov 2027	7
Maplewood Subdiv	Steubenville	0.02	OH0076350	Nov 2027	43
Western Reserve WWTP	Ravenna	0.02	OH0038547	Nov 2027	2
Glenford WWTP	Glenford	0.01	OH0139963	Nov 2027	129
Westfall High School	Williamsport	0.0065	OH0130770	Nov 2027	32
Hickory Hills WWTP	Bryan	0.0055	OH0079073	Nov 2027	19
Odot Dist 1 Park No 1-26 & 25	Lima	0.0039	OH0078590	Nov 2027	5
Evergreen Lane Office Complex	Defiance	0.001	OH0053490	Nov 2027	0
Rushsylvania WWTP	Rushsylvania	—	OH0020575	Nov 2027	9
Maumee River Wastewater Treatment Plant	Waterville	15.06	OH0034223	Dec 2027	15
Sidney WWTP	Sidney	4.66	OH0027421	Dec 2027	12
Clyde WWTP	Clyde	1.75	OH0024686	Dec 2027	16
Hillsboro WWTP	Hillsboro	1.35	OH0020389	Dec 2027	6
Gallipolis WPCF	Gallipolis	1.22	OH0020478	Dec 2027	5
St Clairsville WWTP	St Clairsville	0.59	OH0027294	Dec 2027	3
Oak Hill WWTP	Oak Hill	0.3	OH0026859	Dec 2027	0
Mechanicsburg WWTP	Mechanicsburg	0.17	OH0022209	Dec 2027	243
Beach City WWTP	Beach City	0.14	OH0045489	Dec 2027	23
Russell Park WWTP	Russell	0.07	OH0028860	Dec 2027	0
Madison Co Sewer Dist No 1	London	0.06	OH0102041	Dec 2027	11
Coalton WWTP	Coalton	0.06	OH0050776	Dec 2027	18
Portage Co Red Fox WWTP	Shalersville	0.03	OH0038601	Dec 2027	0
West Manchester WWTP	West Manchester	0.03	OH0127540	Dec 2027	6
Ashtabula Co Meadowood Allotmt WWTP	Ashtabula	0.02	OH0043800	Dec 2027	35
Villa Vista Mhp	Heath	0.009	OH0124362	Dec 2027	14
Queen City Mhp	Chillicothe	0.0045	OH0125148	Dec 2027	2
Cecil WWTP	Cecil	0.004	OH0029238	Dec 2027	13
Camp Campbell Gard	Hamilton	0.0036	OH0131865	Dec 2027	0
Odnr Lake Hope State Park	Zaleski	0.0027	OH0090972	Dec 2027	0
Walnut Elementary School	Ashville	0.0015	OH0130800	Dec 2027	16
Bruewer Woodwork Mfg. Co. (1431473393)	Cleves	0.0012	OH0118931	Dec 2027	2
South Vienna Village WWTP	South Vienna	—	OH0105198	Dec 2027	1

Ohio permit renewals in 2027: 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 2027: Ohio wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/ohio/permits-expiring/2027

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

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