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Ft. Pierre, City of

Sewage treatment plant, Fort Pierre, South Dakota. NPDES permit SD0023582, in force until Jun 30, 2027. Last 12 months: over a limit 8 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values)
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 2 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, 30-day average38.5 mg/L≤ 30 mg/L28%
April 2026BOD, 5-day, 20 deg. C, maximum 7-day average62 mg/L≤ 45 mg/L38%
May 2026Solids, total suspended, 30-day average114.4 mg/L≤ 90 mg/L27%
May 2026Solids, total suspended, maximum 7-day average260 mg/L≤ 135 mg/L93%
July 2026BOD, 5-day, 20 deg. C, 30-day average31.4 mg/L≤ 30 mg/L5%
August 2026Solids, total suspended, 30-day average129 mg/L≤ 90 mg/L43%
August 2026Solids, total suspended, maximum 7-day average140 mg/L≤ 135 mg/L4%
August 2026pH, daily maximum9.09 SU≤ 9 SU—

Limits in force (28)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 90 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 135 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 4.2 lb/dJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ 8.5 lb/dJan, Feb, Dec
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dSep–Nov
Nitrogen, ammonia total [as N]30-day average≤ 7.2 lb/dMar–May
Nitrogen, ammonia total [as N]daily maximum≤ 20.5 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 38.2 lb/dJan, Feb, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 23.9 lb/dSep–Nov
Nitrogen, ammonia total [as N]daily maximum≤ 31.4 lb/dMar–May
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli, colony forming units [CFU]30-day geometric mean≤ 126 #/100mLMay–Sep
E. coli, colony forming units [CFU]daily maximum≤ 235 #/100mLMay–Sep
Flow, totalmonthly totalreport only (Mgal)all year
Coliform, total general30-day geometric mean≤ 5000 #/100mLall year
Coliform, total generaldaily maximum≤ 20000 #/100mLall year
Duration of dischargemonthly totalreport only (d)all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0023582 · MCP: https://passage-data.com/mcp