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Lake Henry city of

Sewage treatment plant, Lake Henry, Minnesota. NPDES permit MN0020885, in force until Jan 31, 2028. Last 12 months: over a limit 7 times (last September 2026), 6 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D004 form A1 monthly (23 values), outfall D004 form A2 monthly (1 value), outfall S007 form A1 monthly (11 values)
Renewal application due
Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, suspended percent removal, monthly average minimum77≥ 85 %53%
February 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum69≥ 85 %107%
February 2026Solids, suspended percent removal, monthly average minimum65≥ 85 %133%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average38≤ 25 mg/L52%
July 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average50≤ 40 mg/L25%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average43≤ 25 mg/L72%
September 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average62≤ 40 mg/L55%

Limits in force (35)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD004
pHmonthly minimum≥ 6 SUall yearD004
pHmonthly maximum≤ 9 SUall yearD004
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD004
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD004
Solids, total suspendedmonthly average≤ 4.54 kg/dall yearD004
Solids, total suspendedmaximum weekly average≤ 6.81 kg/dall yearD004
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepD004
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepD004
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepD004
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD004
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD004
Phosphorus, total [as P]annual total≤ 174 kg/yrall yearD004
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD004
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3.79 kg/dall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 6.06 kg/dall yearD004
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD004
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD004
Precipitation, total defined period/inmonthly totalreport only (in)all yearS007
pHmonthly minimumreport only (SU)all yearS007
pHmonthly maximumreport only (SU)all yearS007
Solids, total suspendedmonthly averagereport only (mg/L)all yearS007
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS007
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepS007
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepS007
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepS007
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS007
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS007
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS007

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/MN0020885 · MCP: https://passage-data.com/mcp