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Worthington city of

Sewage treatment plant, major discharger, Worthington, Minnesota. NPDES permit MN0031186 expired Apr 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D034 form A1 monthly (36 values), outfall D034 form A2 monthly (1 value), outfall D034 form A3 monthly (1 value), outfall S035 form A1 monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 38 reports late

Limits in force (58)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD034
Oxygen, dissolved [DO]monthly minimum≥ 7 mg/Lall yearD034
pHmonthly minimum≥ 6 SUall yearD034
pHmonthly maximum≤ 9 SUall yearD034
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD034
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD034
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD034
Solids, total suspendedmonthly maximumreport only (mg/L)May, SepD034
Solids, total suspendedmonthly average≤ 454 kg/dall yearD034
Solids, total suspendedmaximum weekly average≤ 680 kg/dall yearD034
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD034
Nitrogen, ammonia total [as N]monthly average≤ 16 mg/LJan, Feb, Mar, DecD034
Nitrogen, ammonia total [as N]monthly average≤ 9 mg/LApr–NovD034
Nitrogen, ammonia total [as N]monthly average≤ 242 kg/dJan, Feb, Mar, DecD034
Nitrogen, ammonia total [as N]monthly average≤ 136 kg/dApr–NovD034
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD034
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD034
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD034
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD034
Phosphorus, total [as P]annual total≤ 5526 kg/yrall yearD034
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD034
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD034
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD034
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD034
Chloride [as Cl]daily maximum≤ 444 mg/Lall yearD034
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD034
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD034
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD034
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD034
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD034
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD034
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD034
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)May, SepD034
Mercury, total [as Hg]monthly maximumreport only (ng/L)May, SepD034
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Nov, DecD034
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18 mg/LApr–OctD034
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Nov, DecD034
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LApr–OctD034
BOD, carbonaceous [5 day, 20 C]monthly average≤ 378 kg/dJan, Feb, Mar, Nov, DecD034
BOD, carbonaceous [5 day, 20 C]monthly average≤ 272 kg/dApr–OctD034
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 605 kg/dJan, Feb, Mar, Nov, DecD034
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 605 kg/dApr–OctD034
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD034
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD034
Precipitation, total defined period/inmonthly totalreport only (in)all yearS035
pHmonthly minimumreport only (SU)all yearS035
pHmonthly maximumreport only (SU)all yearS035
Solids, total suspendedmonthly averagereport only (mg/L)all yearS035
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS035
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS035
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS035
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS035
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS035
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS035
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS035
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS035
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS035
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS035

How strict are these limits?

Cited limits by parameter: Minnesota's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0031186 · MCP: https://passage-data.com/mcp