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Zimmerman city of

Sewage treatment plant, Zimmerman, Minnesota. NPDES permit MN0042331, in force until May 31, 2031. Last 12 months: over a limit 20 times (last August 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D026 form A1 monthly (14 values), outfall D026 form A2 monthly (14 values), outfall D026 form A3 monthly (2 values), outfall S027 form A1 monthly (15 values), outfall W030 form A1 monthly (1 value), outfall W031 form A1 monthly (1 value)
Last report on file
August 2026
Oct 2024 – Sep 2025
23 values over a limit, 7 required values missing, 0 of 37 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
November 2025Phosphorus, total [as P], annual total464.05≤ 419 kg/yr11%
December 2025Phosphorus, total [as P], annual total496.46≤ 419 kg/yr18%
January 2026Phosphorus, total [as P], annual total503.61≤ 419 kg/yr20%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average18≤ 15 mg/L20%
February 2026Nitrogen, ammonia total [as N], monthly average23.9≤ 15.6 mg/L53%
February 2026Nitrogen, ammonia total [as N], monthly average31.2≤ 26.6 kg/d17%
February 2026Phosphorus, total [as P], 12-month average1.1≤ 1 mg/L10%
February 2026Phosphorus, total [as P], annual total537.39≤ 419 kg/yr28%
March 2026Nitrogen, ammonia total [as N], monthly average29.8≤ 15.6 mg/L91%
March 2026Nitrogen, ammonia total [as N], monthly average37.2≤ 26.6 kg/d40%
March 2026Phosphorus, total [as P], 12-month average1.1≤ 1 mg/L10%
March 2026Phosphorus, total [as P], annual total531.18≤ 419 kg/yr27%
April 2026Nitrogen, ammonia total [as N], monthly average32.2≤ 9.4 mg/L243%
April 2026Nitrogen, ammonia total [as N], monthly average38.7≤ 16.1 kg/d140%
April 2026Phosphorus, total [as P], 12-month average1.1≤ 1 mg/L10%
April 2026Phosphorus, total [as P], annual total528.31≤ 419 kg/yr26%
May 2026Phosphorus, total [as P], annual total487.67≤ 419 kg/yr16%
June 2026Phosphorus, total [as P], annual total462.22≤ 419 kg/yr10%
July 2026Phosphorus, total [as P], annual total462.71≤ 419 kg/yr10%
August 2026Phosphorus, total [as P], annual total464.34≤ 419 kg/yr11%

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)Mar, SepD026
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD026
pHmonthly minimum≥ 6 SUall yearD026
pHmonthly maximum≤ 9 SUall yearD026
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD026
Solids, total suspendedmonthly maximumreport only (mg/L)JulD026
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD026
Solids, total suspendedmonthly average≤ 51 kg/dall yearD026
Solids, total suspendedmaximum weekly average≤ 77 kg/dall yearD026
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD026
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mL/LJun–SepD026
Nitrogen, ammonia total [as N]monthly average≤ 9.2 mg/LOct, NovD026
Nitrogen, ammonia total [as N]monthly average≤ 9.4 mg/LApr, MayD026
Nitrogen, ammonia total [as N]monthly average≤ 15.6 mg/LJan, Feb, Mar, DecD026
Nitrogen, ammonia total [as N]monthly average≤ 2.2 kg/dJun–SepD026
Nitrogen, ammonia total [as N]monthly average≤ 15.7 kg/dOct, NovD026
Nitrogen, ammonia total [as N]monthly average≤ 16.1 kg/dApr, MayD026
Nitrogen, ammonia total [as N]monthly average≤ 26.6 kg/dJan, Feb, Mar, DecD026
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD026
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD026
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD026
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD026
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD026
Phosphorus, total [as P]annual total≤ 419 kg/yrall yearD026
Chloride [as Cl]monthly maximumreport only (mg/L)Mar, SepD026
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD026
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD026
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD026
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD026
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD026
Solids, total dissolvedmonthly maximumreport only (mg/L)Mar, SepD026
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD026
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD026
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD026
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD026
BOD, carbonaceous [5 day, 20 C]monthly average≤ 26 kg/dall yearD026
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 43 kg/dall yearD026
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD026
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD026
Precipitation, total defined period/inmonthly totalreport only (in)all yearS027
pHmonthly minimumreport only (SU)all yearS027
pHmonthly maximumreport only (SU)all yearS027
Solids, total suspendedmonthly averagereport only (mg/L)all yearS027
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS027
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS027
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS027
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS027
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS027
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearS027
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS027
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS027
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS027
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS027
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS027
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearW030
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearW031

New limits from Jun 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average10 mg/L (Jan, Feb, Mar, Dec)tighter17.5 mg/L (4 values)1.75×
Nitrogen, ammonia total [as N], monthly average5.1 mg/L (Oct, Nov)tighter——
Nitrogen, ammonia total [as N], monthly average5.3 mg/L (Apr, May)tighter——

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/MN0042331 · MCP: https://passage-data.com/mcp