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Amboy city of

Sewage treatment plant, Amboy, Minnesota. NPDES permit MN0022624 expired Jul 31, 2025; its limits still apply. Last 12 months: over a limit 11 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D014 form A1 monthly (33 values), outfall D014 form A2 monthly (2 values), outfall S016 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
28 values over a limit, 0 required values missing, 0 of 28 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, suspended percent removal, monthly average minimum84≥ 85 %7%
April 2026Solids, suspended percent removal, monthly average minimum75≥ 85 %67%
July 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean482≤ 200 #/100mL141%
July 2026Phosphorus, total [as P], annual total437.347≤ 396 kg/yr10%
July 2026Phosphorus, total [as P], monthly average5.4≤ 1.4 kg/d286%
August 2026Phosphorus, total [as P], annual total434.72≤ 396 kg/yr10%
August 2026Solids, suspended percent removal, monthly average minimum80≥ 85 %33%
September 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum82≥ 85 %20%
September 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean400≤ 200 #/100mL100%
September 2026Phosphorus, total [as P], annual total419.616≤ 396 kg/yr6%
September 2026Solids, suspended percent removal, monthly average minimum76≥ 85 %60%

Limits in force (49)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD014
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD014
pHmonthly minimum≥ 6 SUall yearD014
pHmonthly maximum≤ 9 SUall yearD014
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD014
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD014
Solids, total suspendedmonthly maximumreport only (mg/L)JulD014
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD014
Solids, total suspendedmonthly average≤ 32.6 kg/dall yearD014
Solids, total suspendedmaximum weekly average≤ 48.8 kg/dall yearD014
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD014
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD014
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD014
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD014
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–SepD014
Phosphorus, total [as P]monthly average≤ 1.4 kg/dJun–SepD014
Phosphorus, total [as P]annual total≤ 396 kg/yrall yearD014
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD014
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD014
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD014
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD014
Chloride [as Cl]monthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, NovD014
Chloride [as Cl]daily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD014
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD014
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD014
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD014
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD014
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD014
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD014
Solids, total dissolvedmonthly averagereport only (mg/L)all yearD014
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD014
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD014
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD014
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD014
BOD, carbonaceous [5 day, 20 C]monthly average≤ 16.3 kg/dall yearD014
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 27.1 kg/dall yearD014
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD014
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD014
Precipitation, total defined period/inmonthly totalreport only (in)all yearS016
pHmonthly minimumreport only (SU)all yearS016
pHmonthly maximumreport only (SU)all yearS016
Solids, total suspendedmonthly averagereport only (mg/L)all yearS016
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS016
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS016
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS016
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS016

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/MN0022624 · MCP: https://passage-data.com/mcp