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Eagle Butte - City of

Sewage treatment plant, Eagle Butte, South Dakota. NPDES permit SD0020192 expired Jun 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (24 values), outfall I001 form Q quarterly (1 value), outfall R001 form UM quarterly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 0 of 12 reports late

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 51 mg/Lall year001
Solids, total suspended7-day average≤ 77 mg/Lall year001
Oil & Greasedaily maximum≤ 10 mg/Lall year001
Nitrogen, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]30-day averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
E. coli30-day average≤ 126 #/100mLall year001
E. colidaily maximum≤ 410 #/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Flow, totalmonthly averagereport only (MGD)all year001
Flow, totaldaily maximumreport only (MGD)all year001
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year001
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all yearI001
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearR001
pHminimumreport only (SU)all yearR001
pHmaximumreport only (SU)all yearR001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearR001

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/SD0020192 · MCP: https://passage-data.com/mcp