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Plants facing new discharge limits — by state and pollutant

In South Carolina, for Copper, total [as Cu]: 5 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Jul 1, 2027 and Jul 1, 2029 (14 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 · PA 48 · IA 9 · TX 8 · LA 7 · OK 5 · SC 5 · CT 1 · GA 1 · MN 1

By pollutant: all · Chlorine, total residual 8 · Nitrogen, ammonia total [as N] 8 · BOD, 5-day, 20 deg. C 7 · Copper, total [as Cu] 5 · Lead, total [as Pb] 3 · Oxygen demand, ultimate 3 · Phosphorus, total [as P] 3 · Zinc, total [as Zn] 3 · %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia 2 · Cadmium, total [as Cd] 2 · E. coli 2 · Mercury, total [as Hg] 2 · Solids, total suspended 2 · Bis[chloromethyl] ether 1 · BOD, carbonaceous [5 day, 20 C] 1 · Chromium, hexavalent [as Cr] 1 · Flow, in conduit or thru treatment plant 1 · Length of longest pH excursion 1 · Nitrogen, total [as N] 1 · Peracetic Acid 1 · pH 1 · pH range excursions, monthly total accum 1 · Polychlorinated biphenyls [PCBs] 1 · Selenium, total [as Se] 1 · Temp. diff. between up/down stream deg. F 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
INV Nylon Chemicals Americas, LLCSC0002585SCIndustrial, major—Copper, total [as Cu]monthly average 0.011 mg/L, newApr 1, 20280.043 mg/L (3 values)3.91×
INV Nylon Chemicals Americas, LLCSC0002585SCIndustrial, major—Copper, total [as Cu]daily maximum 0.014 mg/L, newApr 1, 20280.043 mg/L (3 values)3.07×
NUCOR STEEL BERKELEYSC0047392SCIndustrial, major—Copper, total [as Cu]daily maximum 0.0058 mg/L, newJul 1, 20270 mg/L (11 values)0×
NUCOR STEEL BERKELEYSC0047392SCIndustrial, major—Copper, total [as Cu]monthly average 0.0037 mg/L, newJul 1, 20270 mg/L (11 values)0×
GREAT FALLS TOWN OFSC0021211SCSewage plant, major1.4 MGDCopper, total [as Cu]daily maximum 29 lb/d, newOct 1, 20280 lb/d (3 values)0×
GREAT FALLS TOWN OFSC0021211SCSewage plant, major1.4 MGDCopper, total [as Cu]daily maximum 2.46 mg/L, newOct 1, 20280 mg/L (3 values)0×
GREAT FALLS TOWN OFSC0021211SCSewage plant, major1.4 MGDCopper, total [as Cu]monthly average 1.9 mg/L, newOct 1, 20280 mg/L (3 values)0×
GREAT FALLS TOWN OFSC0021211SCSewage plant, major1.4 MGDCopper, total [as Cu]monthly average 22 lb/d, newOct 1, 20280 lb/d (3 values)0×
ISLE OF PALMS WATER & SEWER COMMISSIONSC0043583SCSewage plant.22 MGDCopper, total [as Cu]daily maximum 0.083 mg/L, newJan 1, 20290 mg/L (6 values)0×
ISLE OF PALMS WATER & SEWER COMMISSIONSC0043583SCSewage plant.22 MGDCopper, total [as Cu]monthly average 0.053 mg/L, newJan 1, 20290 mg/L (6 values)0×
(Unknown Permittee)SC0049366SCSewage plant1 MGDCopper, total [as Cu]daily maximum 0.11 lb/d, newJul 1, 2029under 3 values—
(Unknown Permittee)SC0049366SCSewage plant1 MGDCopper, total [as Cu]daily maximum 12.7 ug/L, newJul 1, 2029under 3 values—
(Unknown Permittee)SC0049366SCSewage plant1 MGDCopper, total [as Cu]monthly average 0.081 lb/d, newJul 1, 2029under 3 values—
(Unknown Permittee)SC0049366SCSewage plant1 MGDCopper, total [as Cu]monthly average 9.7 ug/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=SC&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