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Litchfield city of

Sewage treatment plant, major discharger, Litchfield, Minnesota. NPDES permit MN0023973, in force until Dec 31, 2030. Last 12 months: over a limit 5 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D074 form A1 monthly (37 values), outfall D074 form A2 monthly (1 value), outfall D074 form A3 monthly (4 values), outfall S083 form A1 monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average8.5≤ 7.5 mg/L13%
February 2026Phosphorus, total [as P], monthly average1.2≤ 1 mg/L20%
April 2026Chloride [as Cl], daily maximum378≤ 349 mg/L8%
June 2026Nitrogen, ammonia total [as N], monthly average2.4≤ 2.1 mg/L14%
July 2026Phosphorus, total [as P], monthly average1.6≤ 1 mg/L60%

Limits in force (63)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD074
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall yearD074
pHmonthly minimum≥ 6 SUall yearD074
pHmonthly maximum≤ 9 SUall yearD074
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD074
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD074
Solids, total suspendedmonthly maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD074
Solids, total suspendedmonthly average≤ 215 kg/dall yearD074
Solids, total suspendedmaximum weekly average≤ 323 kg/dall yearD074
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD074
Nitrogen, ammonia total [as N]monthly average≤ 13.6 mg/LJan, Feb, Mar, DecD074
Nitrogen, ammonia total [as N]monthly average≤ 8.6 mg/LApr, MayD074
Nitrogen, ammonia total [as N]monthly average≤ 5.8 mg/LOct, NovD074
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJun–SepD074
Nitrogen, ammonia total [as N]monthly average≤ 159.3 kg/dJan, Feb, Mar, DecD074
Nitrogen, ammonia total [as N]monthly average≤ 100.7 kg/dApr, MayD074
Nitrogen, ammonia total [as N]monthly average≤ 67.9 kg/dOct, NovD074
Nitrogen, ammonia total [as N]monthly average≤ 24.6 kg/dJun–SepD074
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD074
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD074
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD074
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD074
Phosphorus, total [as P]annual total≤ 2619 kg/yrall yearD074
Chloride [as Cl]daily maximum≤ 349 mg/Lall yearD074
Sulfate, total [as SO4]monthly averagereport only (mg/L)all yearD074
Copper, total [as Cu]monthly average≤ 22 ug/Lall yearD074
Copper, total [as Cu]daily maximum≤ 38 ug/Lall yearD074
Lead, total [as Pb]monthly maximumreport only (ug/L)May, SepD074
Silver, total [as Ag]monthly average≤ .95 ug/Lall yearD074
Silver, total [as Ag]daily maximum≤ 1.65 ug/Lall yearD074
Selenium, total [as Se]monthly average≤ 4.75 ug/Lall yearD074
Selenium, total [as Se]daily maximum≤ 8.23 ug/Lall yearD074
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD074
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD074
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD074
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD074
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD074
Solids, total dissolvedmonthly averagereport only (mg/L)all yearD074
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovD074
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, NovD074
Mercury, total [as Hg]monthly average≤ 9.7 ng/LJan, Mar, May, Jul, Sep, NovD074
Mercury, total [as Hg]daily maximum≤ 16.8 ng/LJan, Mar, May, Jul, Sep, NovD074
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall yearD074
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 7.5 mg/Lall yearD074
BOD, carbonaceous [5 day, 20 C]monthly average≤ 58.6 kg/dall yearD074
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 88 kg/dall yearD074
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD074
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD074
Precipitation, total defined period/inmonthly totalreport only (in)all yearS083
pHmonthly minimumreport only (SU)all yearS083
pHmonthly maximumreport only (SU)all yearS083
Solids, total suspendedmonthly averagereport only (mg/L)all yearS083
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS083
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS083
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS083
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS083
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS083
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS083
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS083
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS083
Mercury, total [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovS083
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS083
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS083

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/MN0023973 · MCP: https://passage-data.com/mcp