Passage Data · Check a report · Use it from your AI
Sewage treatment plant, Custer, South Dakota. NPDES permit SD0024279, in force until May 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 17.5 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 8.8 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 17.5 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jun–Sep | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Feb, Mar | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jan, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.1 mg/L | Jun–Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Feb, Mar | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jan, Nov, Dec | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 002 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 126 #/100mL | May–Sep | 002 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 #/100mL | May–Sep | 002 |
| Flow, total | monthly total | report only (Mgal) | all year | 002 |
| Duration of discharge | monthly total | report only (d) | all year | 002 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| Flow rate | 30-day average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 8.8 SU | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jun–Sep | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Feb, Mar | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jan, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.1 mg/L | Jun–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Feb, Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jan, Nov, Dec | 003 |
Cited limits by parameter: South Dakota's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/SD0024279 · MCP: https://passage-data.com/mcp