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Cokato city of

Sewage treatment plant, Cokato, Minnesota. NPDES permit MN0049204, in force until Mar 31, 2027. Last 12 months: over a limit 6 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D013 form A1 monthly (25 values), outfall D013 form A2 monthly (1 value), outfall D013 form A3 monthly (1 value), outfall S016 form A1 monthly (14 values)
Renewal application due
Oct 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
April 2026Solids, suspended percent removal, monthly average minimum84≥ 85 %7%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average160.6≤ 68.6 kg/d134%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average86≤ 25 mg/L244%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average101≤ 40 mg/L153%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average199.2≤ 109.8 kg/d81%
September 2026Chlorine, total residual, daily maximum3≤ .038 mg/L7795%

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD013
pHmonthly minimum≥ 6 SUall yearD013
pHmonthly maximum≤ 9 SUall yearD013
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD013
Solids, total suspendedannual maximumreport only (mg/L)JulD013
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD013
Solids, total suspendedmonthly average≤ 123.5 kg/dall yearD013
Solids, total suspendedmaximum weekly average≤ 178.4 kg/dall yearD013
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD013
Nitrogen, ammonia total [as N]monthly average≤ 14 mg/LJun–SepD013
Nitrogen, ammonia total [as N]monthly average≤ 38.4 kg/dJun–SepD013
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD013
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD013
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD013
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD013
Phosphorus, total [as P]monthly average≤ 1.21 kg/dJun–SepD013
Phosphorus, total [as P]annual total≤ 1003 kg/yrall yearD013
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD013
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD013
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD013
Mercury, dissolved [as Hg]annual maximumreport only (ng/L)JulD013
Mercury, total [as Hg]annual maximumreport only (ng/L)JulD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 68.6 kg/dall yearD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 109.8 kg/dall yearD013
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD013
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD013
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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS016
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS016
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)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.

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/MN0049204 · MCP: https://passage-data.com/mcp