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Volga, City of

Sewage treatment plant, Volga, South Dakota. NPDES permit SD0021920, in force until Dec 31, 2028. Last 12 months: over a limit 7 times (last August 2026), 7 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 3 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
December 2025Solids, suspended percent removal, monthly average minimum84 %≥ 85 %7%
January 2026Solids, suspended percent removal, monthly average minimum84 %≥ 85 %7%
February 2026pH, daily maximum9.1 SU≤ 9 SU—
April 2026pH, daily maximum9.2 SU≤ 9 SU—
July 2026Solids, suspended percent removal, monthly average minimum73 %≥ 85 %80%
August 2026Solids, suspended percent removal, monthly average minimum62 %≥ 85 %153%

Limits in force (49)

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
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/LJan
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/LFeb–Dec
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 38 mg/LJan
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/LFeb–Dec
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHdaily minimum≥ 6.5 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
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≤ 51.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 22.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 73.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 21.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 9.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 62.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 28.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 9.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 21.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 60.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 146.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 79.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 38.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 79.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 28.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 38.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 lb/dAug
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
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
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %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/SD0021920 · MCP: https://passage-data.com/mcp