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Alcester, City of

Sewage treatment plant, Alcester, South Dakota. NPDES permit SD0021695, in force until Jun 30, 2031. Last 12 months: no values over a limit, 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values), form W quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 0 of 13 reports late

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)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
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Solids, total suspended30-day averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LMar–May
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LJun–Aug
Nitrogen, ammonia total [as N]30-day average≤ 6.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar–May
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Sep
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Oct
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
Toxicity [acute], Ceriodaphnia dubiadaily maximum< 1 tox acuteall year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum< 1 tox acuteall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Oil and grease visualdaily maximum≤ 0 abst=0;prst=1all 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/SD0021695 · MCP: https://passage-data.com/mcp