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Plants facing new discharge limits — by state and pollutant

In Illinois, for Nitrogen, ammonia total [as N]: 3 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Jan 1, 2027 and Oct 1, 2029 (28 limits); 2 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 · IA 90 · LA 80 · MS 63 · MD 45 · PA 45 · OH 40 · MI 33 · VA 33 · GA 22 · SC 8 · NE 7 · NY 7 · TX 7 · IN 6 · KS 6 · MO 5 · UT 5 · OR 4 · SD 4 · TN 4 · IL 3 · AR 2 · MN 2 · NJ 2 · NM 2 · CO 1

By pollutant: all · Phosphorus, total [as P] 6 · Chlorine, total residual 3 · Nitrogen, ammonia total [as N] 3 · Coliform, fecal general 1 · Nitrogen, total [as N] 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]daily maximum 5.6 mg/L (Jan, Feb, Nov, Dec), newJan 1, 202711.9 mg/L (4 values)2.12×
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 4.4 mg/L (Mar, Apr, May, Sep, Oct), newOct 1, 202818.5 mg/L (4 values)4.2×
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 5.1 mg/L (Jun–Aug), newOct 1, 202812 mg/L (3 values)2.35×
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 5.2 mg/L (Jan, Feb, Nov, Dec), newOct 1, 202810.6 mg/L (4 values)2.04×
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]daily maximum 8.1 mg/L (Mar, Apr, May, Sep, Oct), newJan 1, 20277.93 mg/L (5 values)0.979×
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]daily maximum 11.1 mg/L (Jun–Aug), newJan 1, 20275.14 mg/L (3 values)0.463×
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (Mar, Apr, May, Sep, Oct), newJan 1, 2027under 3 values—
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]monthly average 1.5 mg/L (Jun–Aug), newJan 1, 2027under 3 values—
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]monthly average 3.5 mg/L (Jan, Feb, Nov, Dec), newJan 1, 2027under 3 values—
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]weekly average 4 mg/L (Mar, Apr, May, Sep, Oct), newJan 1, 2027under 3 values—
JACKSON GENERATION LLCIL0080134ILIndustrial.46 MGDNitrogen, ammonia total [as N]weekly average 3.8 mg/L (Jun–Aug), newJan 1, 2027under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 1.8 lb/d (Mar, Apr, May, Sep, Oct), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 2.2 lb/d (Jan, Feb, Nov, Dec), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]daily maximum 2.1 lb/d (Jun–Aug), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 1.2 mg/L (Mar, Apr, May, Sep, Oct), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 0.5 lb/d (Mar, Apr, May, Sep, Oct), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 3.2 mg/L (Jan, Feb, Nov, Dec), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 1.3 lb/d (Jan, Feb, Nov, Dec), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 1.2 mg/L (Jun–Aug), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]monthly average 0.5 lb/d (Jun–Aug), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]weekly average 1.3 lb/d (Mar–Oct), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANY IL0070874ILIndustrial.0504 MGDNitrogen, ammonia total [as N]weekly average 3.2 mg/L (Mar–Oct), newOct 1, 2028under 3 values—
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 3.9 mg/L (Mar, Apr, May, Sep, Oct), tighterOct 1, 20292.115 mg/L (4 values)0.542×
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 8.1 lb/d (Mar, Apr, May, Sep, Oct), tighterOct 1, 20294.13 lb/d (3 values)0.51×
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 10.1 mg/L (Jan, Feb, Nov, Dec), tighterOct 1, 20290.84 mg/L (4 values)0.0832×
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 6.9 mg/L (Jun–Aug), tighterOct 1, 20290.48 mg/L (3 values)0.0696×
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 14 lb/d (Jun–Aug), tighterOct 1, 20290.21 lb/d (3 values)0.015×
PRAIRIE PATH WATER COMPANYIL0045381ILIndustrial.25 MGDNitrogen, ammonia total [as N]daily maximum 21 lb/d (Jan, Feb, Nov, Dec), tighterOct 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=IL&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