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Estelline, City of

Sewage treatment plant, Estelline, South Dakota. NPDES permit SD0022144 expired Mar 31, 2024; its limits still apply. Last 12 months: over a limit 7 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average5.53 mg/L≤ 1 mg/L453%
October 2025Nitrogen, ammonia total [as N], daily maximum6.22 mg/L≤ 3.2 mg/L94%
November 2025Nitrogen, ammonia total [as N], 30-day average9.28 mg/L≤ 3.3 mg/L181%
November 2025Nitrogen, ammonia total [as N], daily maximum9.6 mg/L≤ 6.3 mg/L52%
April 2026Nitrogen, ammonia total [as N], 30-day average5.68 mg/L≤ 1 mg/L468%
April 2026Nitrogen, ammonia total [as N], daily maximum5.4 mg/L≤ 3.2 mg/L69%
May 2026Nitrogen, ammonia total [as N], 30-day average1.92 mg/L≤ 1 mg/L92%

Limits in force (18)

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, ammonia total [as N]30-day average≤ 1 mg/LMar–Oct
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LJan, Feb, Nov, Dec
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
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/SD0022144 · MCP: https://passage-data.com/mcp