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Otsego city of

Sewage treatment plant, major discharger, Otsego, Minnesota. NPDES permit MN0064190, in force until Jul 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D023 form A1 monthly (20 values), outfall D023 form A2 monthly (2 values), outfall D023 form A3 monthly (10 values), outfall S024 form A1 monthly (15 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 52 reports late

Limits in force (60)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/LJan, Feb, Mar, DecD023
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)Apr–NovD023
pHmonthly minimum≥ 6 SUall yearD023
pHmonthly maximum≤ 9 SUall yearD023
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD023
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD023
Solids, total suspendedmonthly maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD023
Solids, total suspendedmonthly average≤ 125 kg/dall yearD023
Solids, total suspendedmaximum weekly average≤ 187 kg/dall yearD023
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD023
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LJan, Feb, Mar, DecD023
Nitrogen, ammonia total [as N]monthly average≤ 14 mg/LOct, NovD023
Nitrogen, ammonia total [as N]monthly average≤ 9.9 mg/LJun–SepD023
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Apr, MayD023
Nitrogen, ammonia total [as N]monthly average≤ 21 kg/dJan, Feb, Mar, DecD023
Nitrogen, ammonia total [as N]monthly average≤ 58 kg/dOct, NovD023
Nitrogen, ammonia total [as N]monthly average≤ 41 kg/dJun–SepD023
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Apr, MayD023
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD023
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD023
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD023
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD023
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–SepD023
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD023
Phosphorus, total [as P]monthly average≤ 3.5 kg/dJun–SepD023
Phosphorus, total [as P]annual total≤ 2114 kg/yrall yearD023
Sulfate, total [as SO4]monthly maximumreport only (mg/L)Mar, Jun, Sep, DecD023
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLall yearD023
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD023
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD023
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD023
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD023
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, NovD023
Mercury, total [as Hg]monthly average≤ 10 ng/LJan, Mar, May, Jul, Sep, NovD023
Mercury, total [as Hg]daily maximum≤ 17 ng/LJan, Mar, May, Jul, Sep, NovD023
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, DecD023
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LApr–NovD023
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/LJan, Feb, Mar, DecD023
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LApr–NovD023
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62 kg/dJan, Feb, Mar, DecD023
BOD, carbonaceous [5 day, 20 C]monthly average≤ 104 kg/dApr–NovD023
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 104 kg/dJan, Feb, Mar, DecD023
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 166 kg/dApr–NovD023
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD023
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD023
Precipitation, total defined period/inmonthly totalreport only (in)all yearS024
pHmonthly minimumreport only (SU)all yearS024
pHmonthly maximumreport only (SU)all yearS024
Solids, total suspendedmonthly averagereport only (mg/L)all yearS024
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS024
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS024
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS024
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS024
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS024
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS024
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS024
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS024
Mercury, total [as Hg]monthly maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovS024
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS024
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS024

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/MN0064190 · MCP: https://passage-data.com/mcp