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Plants facing new discharge limits — by state and pollutant

for Hexachlorobenzene: 10 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Dec 1, 2026 and Jul 1, 2029 (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: TX 7 · IA 1 · OH 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
MONUMENT CHEMICAL HOUSTON LLCTX0085979TXIndustrial.22 MGDHexachlorobenzenedaily average 0.000043 lb/d, tighterDec 1, 2026under 3 values—
MONUMENT CHEMICAL HOUSTON LLCTX0085979TXIndustrial.22 MGDHexachlorobenzenedaily maximum 0.0000901 lb/d, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily average 0.000002 mg/L, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily maximum 0.000003 mg/L, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily average 0.00192 lb/d, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily maximum 0.00406 lb/d, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily average 0.0019 lb/d, tighterDec 1, 2026under 3 values—
SHELL CHEMICAL LPTX0004863TXIndustrial, major9.9 MGDHexachlorobenzenedaily maximum 0.0041 lb/d, tighterDec 1, 2026under 3 values—
METTON AMERICA INCTX0084808TXIndustrial—Hexachlorobenzenedaily average 0.0000232 mg/L, tighterFeb 1, 2027under 3 values—
METTON AMERICA INCTX0084808TXIndustrial—Hexachlorobenzenedaily average 3.9e-7 lb/d, tighterFeb 1, 2027under 3 values—
METTON AMERICA INCTX0084808TXIndustrial—Hexachlorobenzenedaily maximum 0.0000491 mg/L, tighterFeb 1, 2027under 3 values—
METTON AMERICA INCTX0084808TXIndustrial—Hexachlorobenzenedaily maximum 8.2e-7 lb/d, tighterFeb 1, 2027under 3 values—
SI GROUP INCTX0087254TXIndustrial.022 MGDHexachlorobenzenedaily average 0.0000015 mg/L, tighterMar 1, 2027under 3 values—
SI GROUP INCTX0087254TXIndustrial.022 MGDHexachlorobenzenedaily maximum 0.0000033 mg/L, tighterMar 1, 2027under 3 values—
JEFFERSON TERMINAL SOUTH LLCTX0004669TXIndustrial, major—Hexachlorobenzenedaily average 0.002 lb/d, tighterMay 1, 2027under 3 values—
JEFFERSON TERMINAL SOUTH LLCTX0004669TXIndustrial, major—Hexachlorobenzenedaily maximum 0.004 lb/d, tighterMay 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenedaily maximum 5 ug/L, newSep 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenemonthly average 5 ug/L, newSep 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenedaily maximum 5 ug/L, newSep 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenemonthly average 5 ug/L, newSep 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenedaily maximum 5 ug/L, newSep 1, 20270.054 ug/L (3 values, 3 below detection)—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenemonthly average 5 ug/L, newSep 1, 20270.054 ug/L (3 values, 3 below detection)—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenedaily maximum 5 ug/L, newSep 1, 2027under 3 values—
CURTISS WRIGHT CORPPA0001228PAIndustrial.55 MGDHexachlorobenzenemonthly average 5 ug/L, newSep 1, 2027under 3 values—
BRASKEM AMERICA INCTX0074276TXIndustrial, major.622 MGDHexachlorobenzenedaily average 0.000005 mg/L, tighterSep 1, 2027under 3 values—
BRASKEM AMERICA INCTX0074276TXIndustrial, major.622 MGDHexachlorobenzenedaily average 0.00004 lb/d, tighterSep 1, 2027under 3 values—
BRASKEM AMERICA INCTX0074276TXIndustrial, major.622 MGDHexachlorobenzenedaily maximum 0.00001 mg/L, tighterSep 1, 2027under 3 values—
BRASKEM AMERICA INCTX0074276TXIndustrial, major.622 MGDHexachlorobenzenedaily maximum 0.00007 lb/d, tighterSep 1, 2027under 3 values—
Dover Chemical CorporationOH0007269OHIndustrial, major—Hexachlorobenzenemonthly average 0.00079 ug/L, tighterOct 1, 2027under 3 values—
Dover Chemical CorporationOH0007269OHIndustrial, major—Hexachlorobenzenemonthly average 0.000015 kg/d, tighterOct 1, 2027under 3 values—
CITY OF CHARITONIA0028924IASewage plant, major2.23 MGDHexachlorobenzene30-day average 0.00000546 mg/L, newJul 1, 2029under 3 values—
CITY OF CHARITONIA0028924IASewage plant, major2.23 MGDHexachlorobenzene30-day average 0.00003994 lb/d, newJul 1, 2029under 3 values—
CITY OF CHARITONIA0028924IASewage plant, major2.23 MGDHexachlorobenzenedaily maximum 0.00003994 lb/d, newJul 1, 2029under 3 values—
CITY OF CHARITONIA0028924IASewage plant, major2.23 MGDHexachlorobenzenedaily maximum 0.00000546 mg/L, newJul 1, 2029under 3 values—
INEOS ACETYLS CHEMICALS TEXAS CITY INCTX0005762TXIndustrial, major3.24 MGDHexachlorobenzenedaily average 0.000023 mg/L, newJul 1, 2029under 3 values—
INEOS ACETYLS CHEMICALS TEXAS CITY INCTX0005762TXIndustrial, major3.24 MGDHexachlorobenzenedaily maximum 0.000049 mg/L, newJul 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