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Avon city of

Sewage treatment plant, Avon, Minnesota. NPDES permit MN0047325, in force until Jun 30, 2030. Last 12 months: over a limit once (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D004 form A1 monthly (28 values), outfall D004 form A3 monthly (2 values), outfall S006 form A1 monthly (14 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 37 reports late

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

Period endingParameterReportedLimitOver by
February 2026Chloride [as Cl], daily maximum588≤ 586 mg/L0%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)Mar, SepD004
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall yearD004
pHmonthly minimum≥ 6 SUall yearD004
pHmonthly maximum≤ 9 SUall yearD004
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD004
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD004
Solids, total suspendedmonthly maximumreport only (mg/L)JulD004
Solids, total suspendedmonthly average≤ 47.9 kg/dall yearD004
Solids, total suspendedmaximum weekly average≤ 71.8 kg/dall yearD004
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD004
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJun–SepD004
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LOct, NovD004
Nitrogen, ammonia total [as N]monthly average≤ 4.2 mg/LApr, MayD004
Nitrogen, ammonia total [as N]monthly average≤ 9.1 mg/LJan, Feb, Mar, DecD004
Nitrogen, ammonia total [as N]monthly average≤ 1.6 kg/dJun–SepD004
Nitrogen, ammonia total [as N]monthly average≤ 4.9 kg/dOct, NovD004
Nitrogen, ammonia total [as N]monthly average≤ 6.7 kg/dApr, MayD004
Nitrogen, ammonia total [as N]monthly average≤ 14.5 kg/dJan, Feb, Mar, DecD004
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD004
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD004
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD004
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD004
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD004
Phosphorus, total [as P]annual total≤ 583 kg/yrall yearD004
Chloride [as Cl]daily maximum≤ 586 mg/Lall yearD004
Sulfate, total [as SO4]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD004
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD004
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD004
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD004
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 10 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8 kg/dall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 16 kg/dall yearD004
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD004
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD004
Precipitation, total defined period/inmonthly totalreport only (in)all yearS006
pHmonthly minimumreport only (SU)all yearS006
pHmonthly maximumreport only (SU)all yearS006
Solids, total suspendedmonthly averagereport only (mg/L)all yearS006
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS006
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS006
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS006
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS006
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS006
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS006
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS006
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS006
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS006

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/MN0047325 · MCP: https://passage-data.com/mcp