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Monticello city of

Sewage treatment plant, major discharger, Monticello, Minnesota. NPDES permit MN0020567, in force until Jul 31, 2031. Last 12 months: over a limit 3 times (last June 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 45 days after each period: outfall D029 form A1 monthly (32 values), outfall D029 form A2 monthly (2 values), outfall D029 form A3 monthly (1 value), outfall S030 form A1 monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 96 required values missing, 6 of 42 reports late

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

Period endingParameterReportedLimitOver by
March 2026Phosphorus, total [as P], annual total2654≤ 2608 kg/yr2%
May 2026Phosphorus, total [as P], annual total2628≤ 2608 kg/yr1%
June 2026Phosphorus, total [as P], annual total2619≤ 2608 kg/yr0%

Limits in force (50)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD029
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD029
pHmonthly minimum≥ 6 SUall yearD029
pHmonthly maximum≤ 9 SUall yearD029
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, NovD029
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD029
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD029
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD029
Solids, total suspendedmonthly average≤ 136 kg/dall yearD029
Solids, total suspendedmaximum weekly average≤ 204 kg/dall yearD029
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD029
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD029
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD029
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD029
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD029
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD029
Phosphorus, total [as P]annual total≤ 2608 kg/yrall yearD029
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD029
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD029
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD029
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD029
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD029
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD029
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD029
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD029
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovD029
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, NovD029
Mercury, total [as Hg]monthly average≤ 10 ng/LJan, Mar, May, Jul, Sep, NovD029
Mercury, total [as Hg]daily maximum≤ 17 ng/LJan, Mar, May, Jul, Sep, NovD029
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD029
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD029
BOD, carbonaceous [5 day, 20 C]monthly average≤ 114 kg/dall yearD029
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 182 kg/dall yearD029
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD029
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD029
Precipitation, total defined period/inmonthly totalreport only (in)all yearS030
pHmonthly minimumreport only (SU)all yearS030
pHmonthly maximumreport only (SU)all yearS030
Solids, total suspendedmonthly averagereport only (mg/L)all yearS030
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS030
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS030
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS030
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS030
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS030
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS030
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS030
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS030
Mercury, total [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovS030
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS030
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS030

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/MN0020567 · MCP: https://passage-data.com/mcp