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Plants facing new discharge limits — by state and pollutant

In Texas, for Nitrogen, ammonia total [as N]: 7 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Nov 1, 2026 and Sep 1, 2029 (15 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: all · IA 90 · LA 80 · MS 63 · MD 45 · PA 45 · OH 40 · MI 33 · VA 33 · GA 22 · SC 8 · NE 7 · NY 7 · TX 7 · IN 6 · KS 6 · MO 5 · UT 5 · OR 4 · SD 4 · TN 4 · IL 3 · AR 2 · MN 2 · NJ 2 · NM 2 · CO 1

By pollutant: all · Zinc, total [as Zn] 11 · BOD, carbonaceous [5 day, 20 C] 8 · Copper, total [as Cu] 8 · Benzo[a]anthracene 7 · Benzo[a]pyrene 7 · Hexachlorobenzene 7 · Nitrogen, ammonia total [as N] 7 · Solids, total suspended 6 · Hexachlorobutadiene 5 · Cyanide, free [as free] 4 · Solids, total dissolved 4 · Aluminum, total [as Al] 3 · Chromium, hexavalent [as Cr] 3 · Nickel, total [as Ni] 3 · Selenium, total [as Se] 3 · Chloride [as Cl] 2 · Di[2-ethylhexyl] phthalate [DEHP] 2 · Enterococci 2 · Flow, in conduit or thru treatment plant 2 · Hexachloroethane 2 · Lead, total [as Pb] 2 · Phosphorus, total [as P] 2 · 1,2-Dichloropropane 1 · 4,4'-DDT 1 · Barium, total [as Ba] 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
CHEMICALS INCORPORATEDTX0118427TXIndustrial.39 MGDNitrogen, ammonia total [as N]daily average 11.5 mg/L, tighterJul 1, 202918.5 mg/L (9 values)1.61×
RIVER RANCH MUD 1TX0137901TXSewage plant.9 MGDNitrogen, ammonia total [as N]daily maximum 10 mg/L, tighterNov 1, 2026under 3 values—
T&W WATER SERVICE COMPANYTX0108138TXIndustrial.014 MGDNitrogen, ammonia total [as N]single grab sample 15 mg/L, newJun 1, 20277.1 mg/L (11 values)0.473×
T&W WATER SERVICE COMPANYTX0108138TXIndustrial.014 MGDNitrogen, ammonia total [as N]daily average 12 mg/L, newJun 1, 20273.73 mg/L (11 values)0.311×
HARRIS CID NO 18TX0132471TXSewage plant, major2.25 MGDNitrogen, ammonia total [as N]daily average 1.8 mg/L, tighterJun 1, 20270.424 mg/L (11 values)0.236×
HARRIS CID NO 18TX0132471TXSewage plant, major2.25 MGDNitrogen, ammonia total [as N]daily average 12 lb/d, tighterJun 1, 20271.36 lb/d (11 values)0.113×
T&W WATER SERVICE COMPANYTX0108138TXIndustrial.014 MGDNitrogen, ammonia total [as N]daily average 1.4 lb/d, newJun 1, 20270.0437 lb/d (11 values)0.0312×
SHIN-ETSU SILICONES OF AMERICA INCTX0124427TXIndustrial, major.7 MGDNitrogen, ammonia total [as N]daily maximum 24 mg/L, newOct 1, 20279.08 mg/L (11 values)0.378×
SHIN-ETSU SILICONES OF AMERICA INCTX0124427TXIndustrial, major.7 MGDNitrogen, ammonia total [as N]daily average 12 mg/L, newOct 1, 20272.46 mg/L (11 values)0.205×
SHIN-ETSU SILICONES OF AMERICA INCTX0124427TXIndustrial, major.7 MGDNitrogen, ammonia total [as N]daily maximum 140 lb/d, newOct 1, 202727.73 lb/d (11 values)0.198×
SHIN-ETSU SILICONES OF AMERICA INCTX0124427TXIndustrial, major.7 MGDNitrogen, ammonia total [as N]daily average 70 lb/d, newOct 1, 20278.05 lb/d (11 values)0.115×
MCGREGOR, CITY OFTX0023914TXSewage plant, major1.1 MGDNitrogen, ammonia total [as N]daily average 18 lb/d, tighterOct 1, 2028under 3 values—
MCGREGOR, CITY OFTX0023914TXSewage plant, major1.1 MGDNitrogen, ammonia total [as N]daily average 2 mg/L, tighterOct 1, 2028under 3 values—
HOUSTON, CITY OFTX0063053TXSewage plant, major7 MGDNitrogen, ammonia total [as N]daily average 3 mL/L, tighterSep 1, 20291000 mL/L (11 values, 11 below detection)check the permit
HOUSTON, CITY OFTX0063053TXSewage plant, major7 MGDNitrogen, ammonia total [as N]daily maximum 7 mL/L, tighterSep 1, 20292000 mL/L (11 values, 2 below detection)check the permit

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=TX&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