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Plants facing new discharge limits — by state and pollutant

In Arkansas, for Mercury, total recoverable: 2 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Jul 1, 2027 and Jul 1, 2027 (6 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 · CA 3 · AR 2 · IN 1 · NJ 1

By pollutant: all · Chlorine, total residual 45 · Copper, total recoverable 4 · Phosphorus, total [as P] 4 · Mercury, total recoverable 2 · Nitrogen, ammonia total [as N] 2 · Zinc, total recoverable 2 · BOD, carbonaceous [5 day, 20 C] 1 · Chloride [as Cl] 1 · Coliform, fecal general 1 · Cyanide, total recoverable 1 · E. coli 1 · Endrin 1 · Lead, total recoverable 1 · Nitrite + Nitrate total [as N] 1 · Nitrogen, nitrate total [as NO3] 1 · Oil & Grease 1 · Solids, total suspended 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
Lanxess Corporation - Central PlantAR0001171ARIndustrial, major—Mercury, total recoverablemonthly average 0.0134 ug/L, newJul 1, 20270.016 ug/L (11 values)1.19×
Lanxess Corporation - Central PlantAR0001171ARIndustrial, major—Mercury, total recoverabledaily maximum 0.0269 ug/L, newJul 1, 20270.016 ug/L (11 values)0.595×
Lanxess Corporation - Central PlantAR0001171ARIndustrial, major—Mercury, total recoverabledaily maximum 0.0269 ug/L, newJul 1, 20270.0099 ug/L (9 values)0.368×
Lanxess Corporation - Central PlantAR0001171ARIndustrial, major—Mercury, total recoverablemonthly average 0.0134 ug/L, newJul 1, 2027under 3 values—
LANXESS Corporation - West PlantAR0043516ARIndustrial—Mercury, total recoverabledaily maximum 0.0269 ug/L, newJul 1, 20270.005 ug/L (11 values, 9 below detection)—
LANXESS Corporation - West PlantAR0043516ARIndustrial—Mercury, total recoverablemonthly average 0.0134 ug/L, newJul 1, 20270.005 ug/L (11 values, 9 below detection)—

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=AR&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