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Redwood Falls city of

Sewage treatment plant, major discharger, Redwood Falls, Minnesota. NPDES permit MN0020401, in force until Dec 31, 2027. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D013 form A1 monthly (37 values), outfall D013 form A2 monthly (3 values), outfall S014 form A1 monthly (14 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 38 reports late

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

Period endingParameterReportedLimitOver by
May 2026Solids, total suspended, monthly average50≤ 45 mg/L11%

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly maximumreport only (deg C)all yearD013
Specific conductancequarterly maximumreport only (umho/cm)Mar, Jun, Sep, DecD013
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD013
pHmonthly minimum≥ 6 SUall yearD013
pHmonthly maximum≤ 9 SUall yearD013
Bicarbonate ion- [as HCO3]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD013
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD013
Solids, total suspendedmonthly maximumreport only (mg/L)May, SepD013
Solids, total suspendedmonthly average≤ 225 kg/dall yearD013
Solids, total suspendedmaximum weekly average≤ 324 kg/dall yearD013
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD013
Nitrogen, ammonia total [as N]monthly average≤ 9.7 mg/LOct, NovD013
Nitrogen, ammonia total [as N]monthly average≤ 7.5 mg/LJun–SepD013
Nitrogen, ammonia total [as N]monthly average≤ 94 mg/LJan, Feb, Mar, DecD013
Nitrogen, ammonia total [as N]monthly average≤ 64 mg/LApr, MayD013
Nitrogen, ammonia total [as N]monthly average≤ 48.4 kg/dOct, NovD013
Nitrogen, ammonia total [as N]monthly average≤ 37.4 kg/dJun–SepD013
Nitrogen, ammonia total [as N]monthly average≤ 469 kg/dJan, Feb, Mar, DecD013
Nitrogen, ammonia total [as N]monthly average≤ 319 kg/dApr, MayD013
Nitrogen, ammonia, tot unionized [as N]daily maximum≤ 1 mg/Lall yearD013
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD013
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD013
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–SepD013
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD013
Phosphorus, total [as P]monthly average≤ 3.9 kg/dJun–SepD013
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD013
Phosphorus, total [as P]annual total≤ 1460 kg/yrall yearD013
Calcium, total [as Ca]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Magnesium, total [as Mg]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Sodium, total [as Na]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Potassium, total [as K]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Chloride [as Cl]monthly average≤ 873 mg/Lall yearD013
Chloride [as Cl]daily maximum≤ 1720 mg/Lall yearD013
Sulfate, total [as SO4]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Chromium, hexavalent [as Cr]monthly maximumreport only (ug/L)May, SepD013
Hardness, Ca Mg Calculated [mg/L as CaCO3]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD013
Solids, total dissolvedquarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD013
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)May, SepD013
Mercury, total [as Hg]monthly maximumreport only (ng/L)May, SepD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 125 kg/dall yearD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 200 kg/dall yearD013
Precipitation, total defined period/inmonthly totalreport only (in)all yearS014
pHmonthly minimumreport only (SU)all yearS014
pHmonthly maximumreport only (SU)all yearS014
Solids, total suspendedmonthly averagereport only (mg/L)all yearS014
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS014
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS014
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS014
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS014
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS014
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS014
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS014
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS014
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS014
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS014

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/MN0020401 · MCP: https://passage-data.com/mcp