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Trunkline Gas Company

Natural Gas Transmission, Johnsonville, Illinois. NPDES permit IL0004294, in force until Aug 31, 2030. Last 12 months: over a limit 3 times (last December 2025), 16 required values missing, 2 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 0 quarterly (40 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 8 required values missing, 1 of 4 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, 30-day average4.3 lb/d≤ 2.21 lb/d95%
December 2025BOD, 5-day, 20 deg. C, 30-day average60 mg/L≤ 10 mg/L500%
December 2025BOD, 5-day, 20 deg. C, daily maximum60 mg/L≤ 20 mg/L200%

Limits in force (64)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. C30-day average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 2.21 lb/dall year
BOD, 5-day, 20 deg. C30-day average≤ 2.21 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 4.42 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 4.42 lb/dall year
pHmonthly minimum≥ 6.5 SUall year
pHmonthly minimum≥ 6.5 SUall year
pHmonthly maximum≤ 9 SUall year
pHmonthly maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 12 mg/Lall year
Solids, total suspended30-day average≤ 12 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspended30-day average≤ 2.65 lb/dall year
Solids, total suspended30-day average≤ 2.65 lb/dall year
Solids, total suspendeddaily maximum≤ 5.3 lb/dall year
Solids, total suspendeddaily maximum≤ 5.3 lb/dall year
Oil & Grease30-day average≤ 15 mg/Lall year
Oil & Grease30-day average≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 30 mg/Lall year
Oil & Greasedaily maximum≤ 30 mg/Lall year
Oil & Grease30-day average≤ 3.32 lb/dall year
Oil & Grease30-day average≤ 3.32 lb/dall year
Oil & Greasedaily maximum≤ 6.63 lb/dall year
Oil & Greasedaily maximum≤ 6.63 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LMar–May
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LMar–May
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LSep, Oct
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LSep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMar–May
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMar–May
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LSep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LSep, Oct
Nitrogen, ammonia total [as N]30-day average≤ .57 lb/dMar–May
Nitrogen, ammonia total [as N]30-day average≤ .57 lb/dMar–May
Nitrogen, ammonia total [as N]30-day average≤ .42 lb/dJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ .42 lb/dJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ .57 lb/dSep, Oct
Nitrogen, ammonia total [as N]30-day average≤ .57 lb/dSep, Oct
Nitrogen, ammonia total [as N]30-day average≤ 1.02 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 1.02 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dMar–May
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dMar–May
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dSep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 3.32 lb/dSep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 2.67 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 2.67 lb/dJan, Feb, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year

How strict are these limits?

Cited limits by parameter: Illinois's rules and the federal ones.

Same industry: the 3 Natural Gas Transmission permits in Illinois.

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Your permit document is the final word. As JSON: /api/v1/permits/IL0004294 · MCP: https://passage-data.com/mcp