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Plants facing new discharge limits — by state and pollutant

In Louisiana, for Zinc, total [as Zn]: 7 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Sep 1, 2027 and Feb 1, 2029 (13 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 12 · TX 11 · LA 7 · SC 3 · IA 2 · MD 1 · MN 1 · NY 1 · WA 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
SABINE PARISH POLICE JURYLA0070904LASewage plant, major—Zinc, total [as Zn]monthly average 0.097 mg/L, tighterSep 1, 20270.018 mg/L (3 values)0.186×
ST. TAMMANY PARISH GOVERNMENTLA0120235LASewage plant, major1.25 MGDZinc, total [as Zn]monthly average 0.67 lb/d, newOct 1, 20270.25 lb/d (3 values)0.373×
ST. TAMMANY PARISH GOVERNMENTLA0120235LASewage plant, major1.25 MGDZinc, total [as Zn]daily maximum 1.59 lb/d, newOct 1, 20270.25 lb/d (3 values)0.157×
TERREBONNE PARISH CONSOLIDATED GOVERNMENTLA0100820LASewage plant—Zinc, total [as Zn]monthly average 0.81 mg/L, tighterOct 1, 2027under 3 values—
TERREBONNE PARISH CONSOLIDATED GOVERNMENTLA0100820LASewage plant—Zinc, total [as Zn]monthly average 0.81 mg/L, tighterOct 1, 2027under 3 values—
TERREBONNE PARISH CONSOLIDATED GOVERNMENTLA0100820LASewage plant—Zinc, total [as Zn]monthly average 0.81 mg/L, tighterOct 1, 2027under 3 values—
WASHINGTON PARISH GOVERNMENTLA0068101LASewage plant—Zinc, total [as Zn]daily maximum 0.11 mg/L, tighterOct 1, 2027under 3 values—
WASHINGTON PARISH GOVERNMENTLA0068101LASewage plant—Zinc, total [as Zn]monthly average 0.045 mg/L, tighterOct 1, 2027under 3 values—
Entergy Arkansas, LLC- Ouachita PlantLA0112780LAIndustrial, major—Zinc, total [as Zn]monthly average 0.48 mg/L, tighterNov 1, 20270.01 mg/L (12 values, 3 below detection)0.0208×
Entergy Operations Inc - Waterford 3 Steam Electric StationLA0007374LAIndustrial, major1433.12 MGDZinc, total [as Zn]daily maximum 0.511 mg/L, tighterJun 1, 2028under 3 values—
Entergy Operations Inc - Waterford 3 Steam Electric StationLA0007374LAIndustrial, major1433.12 MGDZinc, total [as Zn]monthly average 0.215 mg/L, tighterJun 1, 2028under 3 values—
Deridder City of - WWTP & Beneficial Use AreaLA0038407LASewage plant, major3.03 MGDZinc, total [as Zn]monthly average 1.23 lb/d, newFeb 1, 2029under 3 values—
Deridder City of - WWTP & Beneficial Use AreaLA0038407LASewage plant, major3.03 MGDZinc, total [as Zn]weekly average 2.91 lb/d, newFeb 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