Passage Data · Check a report · Use it from your AI
Sewage treatment plant, major discharger, Deadwood, South Dakota. NPDES permit SD0020796 expired Jun 30, 2020; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | ≤ 24 deg C | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Conductivity | 30-day average | ≤ 3651 umho/cm | all year | 001 |
| Conductivity | daily maximum | ≤ 4375 umho/cm | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 17.5 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 8.3 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 18 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 32 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.8 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Dec | 001 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Phenols | daily maximum | report only (ug/L) | all year | 001 |
| Phenols | daily maximum | report only (ug/L) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 126 #/100mL | May–Sep | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 #/100mL | May–Sep | 001 |
| Flow, total | monthly total | report only (Mgal) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.7 toxic | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.7 toxic | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Flow rate | instantaneous minimum | ≥ 7 MGD | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| Rainfall duration | daily maximum | report only (hr) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| pH | daily minimum | report only (SU) | all year | 003 |
| pH | daily maximum | report only (SU) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Floating solids, waste or visible foam-visual | daily maximum | report only (abst=0;prst=1) | all year | 003 |
| Rainfall | daily maximum | report only (in) | all year | 003 |
| E. coli, colony forming units [CFU] | daily maximum | report only (#/100mL) | all year | 003 |
| Number of Events | monthly total | report only (#) | all year | 003 |
| Flow, total | monthly total | report only (Mgal) | all year | 003 |
| Duration of discharge | monthly total | report only (hr) | all year | 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/SD0020796 · MCP: https://passage-data.com/mcp