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Plants facing new discharge limits — by state and pollutant

for Toxicity [acute], Ceriodaphnia dubia: 22 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Jan 1, 2027 and Oct 1, 2032 (36 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: OH 12 · IN 8 · MO 1 · NE 1

By pollutant: all · Nitrogen, ammonia total [as N] 526 · Chlorine, total residual 272 · Phosphorus, total [as P] 106 · E. coli 103 · Copper, total [as Cu] 85 · Copper, total recoverable 63 · Solids, total suspended 60 · Chloride [as Cl] 56 · BOD, carbonaceous [5 day, 20 C] 48 · Zinc, total [as Zn] 39 · Zinc, total recoverable 36 · BOD, 5-day, 20 deg. C 35 · pH 31 · Cyanide, free available 30 · Nitrogen, total [as N] 28 · Iron, total [as Fe] 22 · Mercury, total [as Hg] 22 · Toxicity [acute], Ceriodaphnia dubia 22 · Toxicity [acute], Pimephales promelas [Fathead Minnow] 21 · Selenium, total [as Se] 20 · Di[2-ethylhexyl] phthalate [DEHP] 19 · E. coli, MTEC-MF 19 · Mercury, total low level 19 · Toxicity [chronic], Ceriodaphnia dubia 18 · Toxicity [chronic], Pimephales promelas [Fathead Minnow] 18

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
AMERICAN ELECTRIC POWER, ROCKPORT PLANTIN0051845INIndustrial, major—Toxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Jan–Mar), newJan 1, 2027under 3 values—
Perrysburg, City ofOH0021008OHSewage plant, major8 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Jun, Oct), newJan 1, 2027under 3 values—
PAOLI MUNICIPAL WWTPIN0024023INSewage plant, major.8 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Aug), newMar 1, 2027under 3 values—
AMERICAN ELECTRIC POWER, ROCKPORT PLANTIN0051845INIndustrial, major—Toxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Mar, Sep), newApr 1, 2027under 3 values—
PAOLI MUNICIPAL WWTPIN0024023INSewage plant, major.8 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Sep), newApr 1, 2027under 3 values—
AMERICAN ELECTRIC POWER, ROCKPORT PLANTIN0051845INIndustrial, major—Toxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Apr, Oct), newMay 1, 2027under 3 values—
Ohio Valley Coal CoOH0012661OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newMay 1, 2027under 3 values—
Ohio Valley Coal CoOH0012661OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newMay 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
American Energy CorpOH0059552OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Aug, Dec), newAug 1, 2027under 3 values—
Church and Dwight Co IncOH0058882OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Sep), newAug 1, 2027under 3 values—
Republic Steel - Lorain PlantOH0001562OHIndustrial, major—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Sep, Dec), newAug 1, 2027under 3 values—
City of Johnstown WWTPOH0020508OHSewage plant1.2 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Jun, Aug), newSep 1, 2027under 3 values—
Boardman WWTPOH0037249OHSewage plant, major5 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Jun, Sep, Dec), newDec 1, 2027under 3 values—
city of SunburyOH0055093OHSewage plant2 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Mar, Sep), newJan 1, 2028under 3 values—
American II Wastewater Treatment PlantOH0037338OHSewage plant, major1.2 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Apr, Oct), newAug 1, 2028under 3 values—
HENDRICKS COUNTY RSDIN0057614INSewage plant, major3 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute, newSep 1, 2028under 3 values—
Vicinity Energy Kansas City, Inc.MO0004847MOIndustrial, major—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1.2 toxic, newNov 1, 2028under 3 values—
Morton Salt, Inc.OH0000515OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Sep), newMar 1, 2029under 3 values—
Bedford Wastewater Treatment PlantOH0024040OHSewage plant, major3.2 MGDToxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Jun, Dec), newMay 1, 2029under 3 values—
BROWNSBURG WWTPIN0021245INSewage plant, major5.25 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Mar), newOct 1, 2029under 3 values—
BROWNSBURG WWTPIN0021245INSewage plant, major5.25 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Apr), newNov 1, 2029under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (May), newDec 1, 2029under 3 values—
LOWELL WASTEWATER TREATMENT PLANTIN0023621INSewage plant, major4 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Jun), newJan 1, 2030under 3 values—
WINFIELD WWTPIN0058343INSewage plant, major1.6 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Jun), newJan 1, 2030under 3 values—
LOWELL WASTEWATER TREATMENT PLANTIN0023621INSewage plant, major4 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Jul), newFeb 1, 2030under 3 values—
ROCKPORT NORTH WWTPIN0061662INSewage plant.3 MGDToxicity [acute], Ceriodaphnia dubiamaximum 1 tox acute (Sep), newApr 1, 2030under 3 values—
Austin Powder CompanyOH0006173OHIndustrial—Toxicity [acute], Ceriodaphnia dubiadaily maximum 1 tox acute (Jun, Dec), newJan 1, 2031under 3 values—
OMAHA PAPILLION CREEK WWTFNE0112810NESewage plant, major55 MGDToxicity [acute], Ceriodaphnia dubiamaximum 2.86 tox acute (Jun–Oct), tighterOct 1, 2032under 3 values—
OMAHA PAPILLION CREEK WWTFNE0112810NESewage plant, major55 MGDToxicity [acute], Ceriodaphnia dubiamaximum 2.57 tox acute (Jan, Feb, Nov, Dec), tighterOct 1, 2032under 3 values—
OMAHA PAPILLION CREEK WWTFNE0112810NESewage plant, major55 MGDToxicity [acute], Ceriodaphnia dubiamaximum 2.14 tox acute (Mar–May), tighterOct 1, 2032under 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