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Oronoco city of

Sewage treatment plant, Oronoco, Minnesota. NPDES permit MN0071421 expired Jan 31, 2025; its limits still apply. Last 12 months: over a limit 7 times (last May 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D002 form A1 monthly (23 values), outfall D002 form A3 monthly (1 value), outfall S001 form A1 monthly (14 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 1 required value missing, 0 of 37 reports late

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

Period endingParameterReportedLimitOver by
November 2025Nitrogen, total [as N], monthly average11≤ 10 mg/L10%
December 2025Nitrogen, total [as N], monthly average15.3≤ 10 mg/L53%
January 2026Nitrogen, total [as N], monthly average29.7≤ 10 mg/L197%
February 2026Nitrogen, total [as N], monthly average27.7≤ 10 mg/L177%
February 2026pH, monthly minimum5.4≥ 6 SU—
March 2026Nitrogen, total [as N], monthly average22.5≤ 10 mg/L125%
May 2026Nitrogen, total [as N], monthly average11≤ 10 mg/L10%

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD002
pHmonthly minimum≥ 6 SUall yearD002
pHmonthly maximum≤ 9 SUall yearD002
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD002
Solids, total suspendedmonthly maximumreport only (mg/L)JulD002
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD002
Solids, total suspendedmonthly average≤ 72.3 kg/dall yearD002
Solids, total suspendedmaximum weekly average≤ 108.7 kg/dall yearD002
Nitrogen, total [as N]monthly average≤ 10 mg/Lall yearD002
Nitrogen, total [as N]monthly average≤ 10 mg/Lall yearD002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD002
Phosphorus, total [as P]monthly average≤ .4 mg/Lall yearD002
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD002
Phosphorus, total [as P]year-to-date total≤ 128 kg/yrall yearD002
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD002
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD002
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD002
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 60.3 kg/dall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 96.6 kg/dall yearD002
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD002
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD002
Precipitation, total defined period/inmonthly totalreport only (in)all yearS001
pHmonthly minimumreport only (SU)all yearS001
pHmonthly maximumreport only (SU)all yearS001
Solids, total suspendedmonthly averagereport only (mg/L)all yearS001
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS001
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS001
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS001
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS001
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS001
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS001

How strict are these limits?

Cited limits by parameter: Minnesota'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/MN0071421 · MCP: https://passage-data.com/mcp