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Parkston, City of

Sewage treatment plant, Parkston, South Dakota. NPDES permit SD0022021 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], 30-day average7.96 mg/L≤ 7.5 mg/L6%
May 2026BOD, 5-day, 20 deg. C, 30-day average43 mg/L≤ 30 mg/L43%
May 2026BOD, 5-day, 20 deg. C, maximum 7-day average47 mg/L≤ 45 mg/L4%
June 2026BOD, 5-day, 20 deg. C, 30-day average34 mg/L≤ 30 mg/L13%
June 2026Solids, total suspended, 30-day average118 mg/L≤ 90 mg/L31%

Limits in force (41)

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 average≤ 6.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 7.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5.5 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LDec
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli, colony forming units [CFU]30-day geometric mean≤ 630 #/100mLMay–Sep
E. coli, colony forming units [CFU]daily maximum≤ 1178 #/100mLMay–Sep
Flow, totalmonthly totalreport only (Mgal)all year
Flowing, Receiving Streamdaily maximumreport only (N=0;Y=1)all 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0022021 · MCP: https://passage-data.com/mcp