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Plants facing new discharge limits — by state and pollutant

for Nitrite + Nitrate total [as N]: 5 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Dec 1, 2026 and Oct 1, 2029 (10 limits); 1 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: AR 1 · IA 1 · IN 1 · OR 1 · PA 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
DUKE ENERGY INDIANA CAYUGA GENERATING STATIONIN0002763INIndustrial, major—Nitrite + Nitrate total [as N]monthly average 1.2 mg/L, newJan 1, 202991 mg/L (11 values)75.8×
DUKE ENERGY INDIANA CAYUGA GENERATING STATIONIN0002763INIndustrial, major—Nitrite + Nitrate total [as N]daily maximum 2 mg/L, newJan 1, 2029110 mg/L (11 values)55×
HOMER CITY GENERATION LPPA0005037PAIndustrial, major20.541 MGDNitrite + Nitrate total [as N]daily maximum 2 mg/L, newDec 1, 2026under 3 values—
HOMER CITY GENERATION LPPA0005037PAIndustrial, major20.541 MGDNitrite + Nitrate total [as N]monthly average 1.2 mg/L, newDec 1, 2026under 3 values—
MUSCATINE POWER AND WATERIA0001082IAIndustrial, major—Nitrite + Nitrate total [as N]30-day average 1.2 mg/L, newJan 1, 2029under 3 values—
MUSCATINE POWER AND WATERIA0001082IAIndustrial, major—Nitrite + Nitrate total [as N]daily maximum 2 mg/L, newJan 1, 2029under 3 values—
SUTHERLIN, CITY OFOR0020842ORSewage plant1.3 MGDNitrite + Nitrate total [as N]monthly average 10 mg/L, newFeb 1, 20293.2 mg/L (5 values)0.32×
SUTHERLIN, CITY OFOR0020842ORSewage plant1.3 MGDNitrite + Nitrate total [as N]daily maximum 24.5 mg/L, newFeb 1, 20294 mg/L (5 values)0.163×
Siloam Springs, City ofAR0020273ARSewage plant, major5.3 MGDNitrite + Nitrate total [as N]instantaneous maximum 10 mg/L, newOct 1, 2029under 3 values—
Siloam Springs, City ofAR0020273ARSewage plant, major5.3 MGDNitrite + Nitrate total [as N]monthly average 442 lb/d, newOct 1, 2029under 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