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Byron city of

Sewage treatment plant, Byron, Minnesota. NPDES permit MN0049239, in force until Jun 30, 2027. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D016 form A1 monthly (33 values), outfall D016 form A2 monthly (1 value), outfall D016 form A3 monthly (1 value), outfall S017 form A1 monthly (12 values)
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 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
May 2026Phosphorus, total [as P], monthly average1.1≤ 1 mg/L10%
June 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean852≤ 200 #/100mL326%

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD016
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD016
pHmonthly minimum≥ 6 SUall yearD016
pHmonthly maximum≤ 9 SUall yearD016
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD016
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD016
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD016
Solids, total suspendedmonthly maximumreport only (mg/L)JulD016
Solids, total suspendedmonthly average≤ 159 kg/dall yearD016
Solids, total suspendedmaximum weekly average≤ 238 kg/dall yearD016
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD016
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LJun–SepD016
Nitrogen, ammonia total [as N]monthly average≤ 21 mg/LOct, NovD016
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)MarD016
Nitrogen, ammonia total [as N]monthly average≤ 32.3 kg/dJun–SepD016
Nitrogen, ammonia total [as N]monthly average≤ 111.3 kg/dOct, NovD016
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD016
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD016
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD016
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD016
Phosphorus, total [as P]monthly average≤ 8.9 kg/dJun–SepD016
Phosphorus, total [as P]annual total≤ 1547 kg/yrall yearD016
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD016
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD016
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD016
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD016
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD016
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD016
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD016
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD016
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD016
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD016
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD016
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD016
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD016
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD016
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD016
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD016
BOD, carbonaceous [5 day, 20 C]monthly average≤ 79 kg/dall yearD016
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 132 kg/dall yearD016
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD016
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD016
Precipitation, total defined period/inmonthly totalreport only (in)all yearS017
pHmonthly minimumreport only (SU)all yearS017
pHmonthly maximumreport only (SU)all yearS017
Solids, total suspendedmonthly averagereport only (mg/L)all yearS017
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS017
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS017
Phosphorus, total [as P]monthly maximumreport only (mg/L)all yearS017
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS017
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS017

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/MN0049239 · MCP: https://passage-data.com/mcp