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Natural Gas Transmission, Redfield, Iowa. NPDES permit IA0000299 expired Sep 30, 2025; its limits still apply. Last 12 months: no values over a limit, 30 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | 30-day average | report only (SU) | all year | 001 |
| pH | daily maximum | report only (SU) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Mar | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | ≤ 394 mg/L | all year | 001 |
| Chloride [as Cl] | daily maximum | ≤ 630 mg/L | all year | 001 |
| Iron, total [as Fe] | 30-day average | ≤ 8.28 mg/L | all year | 001 |
| Iron, total [as Fe] | daily maximum | ≤ 8.28 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.9 mg/L | Jan | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Mar | 002 |
| Chloride [as Cl] | 30-day average | ≤ 394 mg/L | all year | 002 |
| Chloride [as Cl] | daily maximum | ≤ 630 mg/L | all year | 002 |
| Iron, total [as Fe] | 30-day average | ≤ 8.28 mg/L | all year | 002 |
| Iron, total [as Fe] | daily maximum | ≤ 8.28 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.8 lb/d | Apr | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24.1 lb/d | Nov | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25.7 lb/d | Dec | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 lb/d | Feb | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.4 lb/d | Jul | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.3 lb/d | Jan | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 lb/d | Sep | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.1 lb/d | Oct | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.6 lb/d | Jun | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 lb/d | Aug | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 lb/d | May | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.3 lb/d | Mar | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.5 lb/d | Apr | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.2 lb/d | Nov | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38.3 lb/d | Dec | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83 lb/d | Feb | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.7 lb/d | Jul | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 196 lb/d | Jan | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.2 lb/d | Sep | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.2 lb/d | Oct | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.7 lb/d | Jun | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.2 lb/d | Aug | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.7 lb/d | May | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38.4 lb/d | Mar | SUM |
| Chloride [as Cl] | 30-day average | ≤ 3873 lb/d | all year | SUM |
| Chloride [as Cl] | daily maximum | ≤ 6197 lb/d | all year | SUM |
| Iron, total [as Fe] | 30-day average | ≤ 81.4 lb/d | all year | SUM |
| Iron, total [as Fe] | daily maximum | ≤ 81.4 lb/d | all year | SUM |
Cited limits by parameter: Iowa's rules and the federal ones.
Same industry: the 4 Natural Gas Transmission permits in Iowa.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IA0000299 · MCP: https://passage-data.com/mcp