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Mayer city of

Sewage treatment plant, Mayer, Minnesota. NPDES permit MN0021202, in force until Feb 28, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D003 form A1 monthly (30 values), outfall D003 form A2 monthly (2 values), outfall D003 form A3 monthly (6 values), outfall S004 form A1 monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 20 reports late

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD003
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/LJan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, DecD003
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)Apr, MayD003
pHmonthly minimum≥ 6 SUall yearD003
pHmonthly maximum≤ 9 SUall yearD003
Solids, total suspendedmonthly averagereport only (mg/L)May, SepD003
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD003
Solids, total suspendeddaily maximumreport only (mg/L)May, SepD003
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD003
Solids, total suspendedmonthly average≤ 49.3 kg/dall yearD003
Solids, total suspendedmaximum weekly average≤ 74 kg/dall yearD003
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD003
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Apr, MayD003
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LOct, NovD003
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LJan, Feb, Mar, DecD003
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LJun–SepD003
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Apr, MayD003
Nitrogen, ammonia total [as N]monthly average≤ 19.7 kg/dOct, NovD003
Nitrogen, ammonia total [as N]monthly average≤ 8.2 kg/dJan, Feb, Mar, DecD003
Nitrogen, ammonia total [as N]monthly average≤ 3.8 kg/dJun–SepD003
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD003
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD003
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD003
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD003
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD003
Phosphorus, total [as P]annual total≤ 601 kg/yrall yearD003
Chloride [as Cl]monthly average≤ 607 mg/Lall yearD003
Chloride [as Cl]daily maximumreport only (mg/L)all yearD003
Sulfate, total [as SO4]monthly averagereport only (mg/L)all yearD003
Sulfate, total [as SO4]monthly averagereport only (kg/d)all yearD003
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD003
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD003
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepD003
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)May, SepD003
Mercury, total [as Hg]monthly average≤ 10 ng/LMay, SepD003
Mercury, total [as Hg]daily maximum≤ 17 ng/LMay, SepD003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, DecD003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LApr, MayD003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 22.5 mg/LJan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, DecD003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 37.5 mg/LApr, MayD003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 24.7 kg/dJan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, DecD003
BOD, carbonaceous [5 day, 20 C]monthly average≤ 41.1 kg/dApr, MayD003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 37 kg/dJan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, DecD003
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 61.7 kg/dApr, MayD003
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD003
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD003
Precipitation, total defined period/inmonthly totalreport only (in)all yearS004
pHmonthly minimumreport only (SU)all yearS004
pHmonthly maximumreport only (SU)all yearS004
Solids, total suspendedmonthly averagereport only (mg/L)all yearS004
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS004
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS004
Mercury, total [as Hg]monthly averagereport only (ng/L)May, SepS004
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS004
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS004

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/MN0021202 · MCP: https://passage-data.com/mcp