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Plants facing new discharge limits — by state and pollutant

In Indiana, for Nitrogen, ammonia total [as N]: 6 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Dec 1, 2026 and May 31, 2031 (33 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 · 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 · Toxicity [acute], Ceriodaphnia dubia 8 · Toxicity [acute], Pimephales promelas [Fathead Minnow] 8 · Toxicity [chronic], Ceriodaphnia dubia 8 · Toxicity [chronic], Pimephales promelas [Fathead Minnow] 7 · Nitrogen, ammonia total [as N] 6 · Phosphorus, total [as P] 6 · Selenium, total recoverable 5 · Zinc, total recoverable 5 · Cyanide, free [as free] 4 · Lead, total recoverable 3 · Cadmium, total recoverable 2 · Chloride [as Cl] 2 · Nickel, total recoverable 2 · Silver total recoverable 2 · Solids, total suspended 2 · Arsenic, total recoverable 1 · BOD, carbonaceous [5 day, 20 C] 1 · Boron, total recoverable 1 · Bromide [as Br] 1 · Copper, total recoverable 1 · Cyanide, total recoverable 1 · E. coli, colony forming units [CFU] 1 · Fluoride, total [as F] 1 · Manganese, total recoverable 1 · Mercury, total recoverable 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
WESTPORT WWTPIN0024830INSewage plant.43 MGDNitrogen, ammonia total [as N]monthly average 3.2 mg/L (Jan, Feb, Mar, Apr, Dec), tighterDec 1, 20269.023 mg/L (3 values)2.82×
WESTPORT WWTPIN0024830INSewage plant.43 MGDNitrogen, ammonia total [as N]maximum weekly average 4.8 mg/L (Jan, Feb, Mar, Apr, Dec), tighterDec 1, 202611.4 mg/L (3 values)2.38×
WESTPORT WWTPIN0024830INSewage plant.43 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (May–Nov), tighterDec 1, 20263.645 mg/L (4 values)2.28×
WESTPORT WWTPIN0024830INSewage plant.43 MGDNitrogen, ammonia total [as N]maximum weekly average 2.4 mg/L (May–Nov), tighterDec 1, 20264.065 mg/L (4 values)1.69×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]monthly average 3.2 mg/L (Jan, Feb, Mar, Apr, Dec), newJun 1, 20282.37 mg/L (5 values)0.741×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]daily maximum 7.7 mg/L (Jan, Feb, Mar, Apr, Dec), newJun 1, 20282.73 mg/L (5 values)0.355×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (May–Nov), newJun 1, 20280.325 mg/L (6 values)0.203×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (May–Nov), newJun 1, 20280.25 mg/L (6 values)0.156×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]monthly average 3.2 mg/L (Jan, Feb, Mar, Apr, Dec), newJun 1, 20280.49 mg/L (5 values)0.153×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]daily maximum 3.9 mg/L (May–Nov), newJun 1, 20280.395 mg/L (6 values)0.101×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]daily maximum 7.7 mg/L (Jan, Feb, Mar, Apr, Dec), newJun 1, 20280.55 mg/L (5 values)0.0714×
IPALCO - PETERSBURG GEN STATIONIN0002887INIndustrial, major340 MGDNitrogen, ammonia total [as N]daily maximum 3.9 mg/L (May–Nov), newJun 1, 20280.25 mg/L (6 values)0.0641×
LAOTTO REGIONAL SEWER DISTRICTIN0058611INSewage plant.05 MGDNitrogen, ammonia total [as N]daily maximum 10 mg/L (May–Nov), newAug 1, 2029under 3 values—
LAOTTO REGIONAL SEWER DISTRICTIN0058611INSewage plant.05 MGDNitrogen, ammonia total [as N]daily maximum 11 mg/L (Jan, Feb, Mar, Apr, Dec), newAug 1, 2029under 3 values—
LAOTTO REGIONAL SEWER DISTRICTIN0058611INSewage plant.05 MGDNitrogen, ammonia total [as N]monthly average 5 mg/L (May–Nov), newAug 1, 2029under 3 values—
LAOTTO REGIONAL SEWER DISTRICTIN0058611INSewage plant.05 MGDNitrogen, ammonia total [as N]monthly average 5.3 mg/L (Jan, Feb, Mar, Apr, Dec), newAug 1, 2029under 3 values—
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]monthly average 0.14 lb/d (May–Nov), tighterOct 1, 20300.0175 lb/d (6 values)0.125×
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]monthly average 1.1 mg/L (May–Nov), tighterOct 1, 20300.1 mg/L (6 values)0.0909×
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (Jan, Feb, Mar, Apr, Dec), tighterOct 1, 20300.1 mg/L (5 values)0.0625×
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]monthly average 0.2 lb/d (Jan, Feb, Mar, Apr, Dec), tighterOct 1, 20300.005 lb/d (5 values)0.025×
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]monthly average 8.3 lb/d (May–Nov), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]monthly average 1 mg/L (May–Nov), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]monthly average 1.6 mg/L (Jan, Feb, Mar, Apr, Dec), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]monthly average 13 lb/d (Jan, Feb, Mar, Apr, Dec), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]maximum weekly average 13 lb/d (May–Nov), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]maximum weekly average 1.5 mg/L (May–Nov), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]maximum weekly average 2.4 mg/L (Jan, Feb, Mar, Apr, Dec), newOct 1, 2030under 3 values—
FLORA MUNICIPAL WWTPIN0020141INSewage plant.428 MGDNitrogen, ammonia total [as N]maximum weekly average 20 lb/d (Jan, Feb, Mar, Apr, Dec), newOct 1, 2030under 3 values—
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]weekly average 0.2 lb/d (May–Nov), tighterOct 1, 2030under 3 values—
HELMSBURG REGIONAL SEWER DISTRICTIN0058416INSewage plant.025 MGDNitrogen, ammonia total [as N]weekly average 0.3 lb/d (Jan, Feb, Mar, Apr, Dec), tighterOct 1, 2030under 3 values—
CLAYPOOL WWTPIN0039870INSewage plant.0336 MGDNitrogen, ammonia total [as N]monthly average 4.2 mg/L (May–Nov), tighterMay 31, 20310.845 mg/L (3 values)0.201×
CLAYPOOL WWTPIN0039870INSewage plant.0336 MGDNitrogen, ammonia total [as N]monthly average 8.1 mg/L (Jan, Feb, Mar, Apr, Dec), tighterMay 31, 2031under 3 values—
CLAYPOOL WWTPIN0039870INSewage plant.0336 MGDNitrogen, ammonia total [as N]weekly average 6.3 mg/L (May–Nov), tighterMay 31, 2031under 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=IN&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