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In Ohio, for Toxicity [chronic], Pimephales promelas [Fathead Minnow]: 10 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Feb 1, 2027 and Jan 1, 2029 (10 limits); 0 of them reported a median above that limit between Oct 1, 2025 and Sep 30, 2026. EPA's file of Oct 16, 2026.
By state: all · OH 10 · IN 7 · MO 1
By pollutant: all · Nitrogen, ammonia total [as N] 40 · Solids, total suspended 23 · BOD, carbonaceous [5 day, 20 C] 20 · Mercury, total low level 19 · E. coli, MTEC-MF 18 · Copper, total recoverable 17 · Cyanide, free available 17 · Chlorine, total residual 16 · pH 15 · Phosphorus, total [as P] 12 · Toxicity [acute], Ceriodaphnia dubia 12 · Solids, total dissolved- 180 deg. C 11 · Toxicity [acute], Pimephales promelas [Fathead Minnow] 11 · Toxicity [chronic], Pimephales promelas [Fathead Minnow] 10 · Zinc, total recoverable 10 · Toxicity [chronic], Ceriodaphnia dubia 9 · Selenium, total recoverable 8 · Chromium, hexavalent dissolved [as Cr] 7 · Cadmium, total recoverable 6 · Di[2-ethylhexyl] phthalate [DEHP] 6 · Lead, total recoverable 6 · Silver total recoverable 4 · Carcinogen additivity factor 2 · Nitrogen, inorganic total 2 · Oil and grease, hexane extr method 2
| Plant | Permit | State | Type | Design flow | Parameter | New limit | Effective | Today's median | × limit |
|---|---|---|---|---|---|---|---|---|---|
| Bluffton WWTP | OH0020851 | OH | Sewage plant, major | 1.9 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1 tox chronic (May, Nov), new | Feb 1, 2027 | under 3 values | — |
| Republic Steel - Lorain Plant | OH0001562 | OH | Industrial, major | — | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 4.44 tox chronic (Mar, Jun, Aug, Dec), new | Aug 1, 2027 | under 3 values | — |
| North Royalton WWTP 'B' | OH0026808 | OH | Sewage plant | 1 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1 tox chronic (Jun, Aug), new | Nov 1, 2027 | under 3 values | — |
| Boardman WWTP | OH0037249 | OH | Sewage plant, major | 5 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1.2 tox chronic (Mar, Jun, Sep, Dec), new | Dec 1, 2027 | under 3 values | — |
| City of Mansfield WWTP | OH0026328 | OH | Sewage plant, major | 24 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1.22 tox chronic (Feb, May, Aug, Nov), new | Apr 1, 2028 | under 3 values | — |
| Detrex Corporation, Chemicals Division | OH0001872 | OH | Industrial, major | — | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum 1 tox chronic (Jun, Sep), new | Jun 1, 2028 | under 3 values | — |
| NEORSD Southerly Wastewater Treatment Center | OH0024651 | OH | Sewage plant, major | 175 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1.1 tox chronic (Mar, Jun, Sep, Dec), new | Jul 1, 2028 | under 3 values | — |
| NEORSD Westerly Wastewater Treatment Center | OH0024660 | OH | Sewage plant, major | 35 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 11 tox chronic (May, Nov), new | Jul 1, 2028 | under 3 values | — |
| North Olmsted WWTP | OH0026778 | OH | Sewage plant, major | 7 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1.53 tox chronic (Jun, Sep), new | Aug 1, 2028 | under 3 values | — |
| City of Wellston North Wastewater Treatment Plant | OH0023507 | OH | Sewage plant, major | 1.44 MGD | Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average 1.14 tox chronic (Mar, Sep), new | Jan 1, 2029 | under 3 values | — |
Each limit is one EPA's ICIS-NPDES file holds on the permit's current version with a begin date after today, enforceable and numeric, either on a parameter the outfall was never limited on (new) or lower than the limit in force (tighter). Today's median is the plant's own reported values for the same outfall, statistic and unit between Oct 1, 2025 and Sep 30, 2026, with how many; none is shown where most were below a detection limit. Read the permit before relying on a value.
Sell to these plants? The list for your states every week, with every plant over a limit on your pollutant, as a spreadsheet, by API and by email when a new one appears: ask for the plant list, or write to info@passage-data.com. What a seller gets.
For programs and AI agents: a state's permits with these limits as JSON at /api/v1/permits?state=OH&upcoming=true, narrowed with &facility_type=potw or &min_flow_mgd=1; the whole list at /dmr/data/upcoming.json; or add https://passage-data.com/mcp as a remote MCP server (tool list_permits). Free, no key. llms.txt
From EPA's ECHO data, not the permit document itself: your permit is the final word. All states