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Spring Grove city of

Sewage treatment plant, Spring Grove, Minnesota. NPDES permit MN0021440, in force until Jun 30, 2029. Last 12 months: over a limit 18 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 46 days after each period: outfall D011 form A1 monthly (25 values), outfall D012 form A1 quarterly (1 value), outfall S013 form A1 monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 8 required values missing, 4 of 29 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
November 2025Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean636≤ 200 #/100mL218%
November 2025Solids, suspended percent removal, monthly average minimum80≥ 85 %33%
November 2025Solids, total suspended, monthly average46≤ 30 mg/L53%
November 2025Solids, total suspended, maximum weekly average68≤ 45 mg/L51%
December 2025Solids, suspended percent removal, monthly average minimum63≥ 85 %147%
December 2025Solids, total suspended, monthly average59≤ 30 mg/L97%
December 2025Solids, total suspended, maximum weekly average69≤ 45 mg/L53%
March 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum63≥ 85 %147%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average39≤ 25 mg/L56%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average55≤ 40 mg/L38%
March 2026Solids, suspended percent removal, monthly average minimum77≥ 85 %53%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average60.2≤ 35.7 kg/d69%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average90.8≤ 57.2 kg/d59%
May 2026Solids, total suspended, monthly average116.2≤ 42.9 kg/d171%
May 2026Solids, total suspended, maximum weekly average222.6≤ 64.3 kg/d246%
May 2026Solids, total suspended, maximum weekly average49≤ 45 mg/L9%
June 2026Solids, suspended percent removal, monthly average minimum79≥ 85 %40%
July 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean438≤ 200 #/100mL119%

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD011
pHmonthly minimum≥ 6 SUall yearD011
pHmonthly maximum≤ 9 SUall yearD011
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD011
Solids, total suspendedmonthly maximumreport only (mg/L)JulD011
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD011
Solids, total suspendedmonthly average≤ 42.9 kg/dall yearD011
Solids, total suspendedmaximum weekly average≤ 64.3 kg/dall yearD011
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD011
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD011
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD011
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMar–NovD011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD011
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD011
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD011
Chlorine, total residualdaily maximumreport only (mg/L)Mar–NovD011
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD011
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD011
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 35.7 kg/dall yearD011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 57.2 kg/dall yearD011
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD011
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD011
Trichloroethylenedaily maximumreport only (ug/L)all yearD012
Precipitation, total defined period/inmonthly totalreport only (in)all yearS013
pHmonthly minimumreport only (SU)all yearS013
pHmonthly maximumreport only (SU)all yearS013
Solids, total suspendedmonthly averagereport only (mg/L)all yearS013
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS013
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS013
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS013
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS013
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS013
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS013
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS013
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS013
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS013

How strict are these limits?

Cited limits by parameter: Minnesota'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/MN0021440 · MCP: https://passage-data.com/mcp