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Plants facing new discharge limits — by state and pollutant

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

By pollutant: all · Nitrogen, ammonia total [as N] 80 · Chlorine, total residual 78 · Copper, total [as Cu] 7 · Zinc, total [as Zn] 7 · Mercury, total [as Hg] 5 · Solids, total dissolved 4 · Solids, total suspended 4 · Nitrogen, ammonia [NH3-N] 3 · BOD, 5-day, 20 deg. C 2 · Cadmium, total [as Cd] 2 · Cyanide, total [as CN] 2 · 1,2-Dichloroethane 1 · 2,3,7,8-Tetrachlorodibenzo-p-dioxin 1 · BOD, carbonaceous [5 day, 20 C] 1 · Carbon tetrachloride 1 · Chromium, hexavalent [as Cr] 1 · Heptachlor 1 · Lead, total [as Pb] 1 · Oil & Grease 1 · Phenolics, total recoverable 1 · Vinyl chloride 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
TERREBONNE PARISH CONSOLIDATED GOVERNMENTLA0100820LASewage plant—Copper, total [as Cu]daily maximum 0.27 mg/L, newOct 1, 2027under 3 values—
TERREBONNE PARISH CONSOLIDATED GOVERNMENTLA0100820LASewage plant—Copper, total [as Cu]monthly average 0.11 mg/L, newOct 1, 2027under 3 values—
Entergy Arkansas, LLC- Ouachita PlantLA0112780LAIndustrial, major—Copper, total [as Cu]daily maximum 0.303 mg/L, newNov 1, 2027under 3 values—
Entergy Arkansas, LLC- Ouachita PlantLA0112780LAIndustrial, major—Copper, total [as Cu]monthly average 0.128 mg/L, newNov 1, 2027under 3 values—
LAKE CHARLES HARBOR & TERMINAL DISTRICTLA0091812LAIndustrial—Copper, total [as Cu]monthly average 0.022 mg/L, newJan 1, 20280.005 mg/L (3 values, 1 below detection)0.227×
LAKE CHARLES HARBOR & TERMINAL DISTRICTLA0091812LAIndustrial—Copper, total [as Cu]daily maximum 0.053 mg/L, newJan 1, 20280.005 mg/L (3 values, 1 below detection)0.0943×
Ferriday Town of - Town of Ferriday WWTPLA0020630LASewage plant, major.8 MGDCopper, total [as Cu]monthly average 0.12 lb/d, newOct 1, 2028under 3 values—
Ferriday Town of - Town of Ferriday WWTPLA0020630LASewage plant, major.8 MGDCopper, total [as Cu]weekly average 0.28 lb/d, newOct 1, 2028under 3 values—
Cleco Power, LLC- Rodemacher Power StationLA0008036LAIndustrial, major—Copper, total [as Cu]daily maximum 27 ug/L, tighterDec 1, 2028under 3 values—
Cleco Power, LLC- Rodemacher Power StationLA0008036LAIndustrial, major—Copper, total [as Cu]monthly average 11.2 ug/L, tighterDec 1, 2028under 3 values—
Louisiana Energy & Power Authority (LEPA) - Morgan City Power PlantLA0126527LAIndustrial.323 MGDCopper, total [as Cu]daily maximum 0.064 mg/L, newJul 1, 2029under 3 values—
Louisiana Energy & Power Authority (LEPA) - Morgan City Power PlantLA0126527LAIndustrial.323 MGDCopper, total [as Cu]monthly average 0.027 mg/L, newJul 1, 2029under 3 values—
St Martinville City of - STPLA0040941LASewage plant, major2.5 MGDCopper, total [as Cu]monthly average 0.24 lb/d, newJul 1, 20290.004 lb/d (3 values, 2 below detection)—
St Martinville City of - STPLA0040941LASewage plant, major2.5 MGDCopper, total [as Cu]weekly average 0.56 lb/d, 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=LA&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