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Lake Crystal city of

Sewage treatment plant, Lake Crystal, Minnesota. NPDES permit MN0055981, in force until Mar 31, 2029. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D017 form A1 monthly (27 values), outfall D017 form A2 monthly (2 values), outfall S018 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD017
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD017
pHmonthly minimum≥ 6 SUall yearD017
pHmonthly maximum≤ 9 SUall yearD017
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD017
Solids, total suspendedmonthly maximumreport only (mg/L)JulD017
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD017
Solids, total suspendedmonthly average≤ 66.9 kg/dall yearD017
Solids, total suspendedmaximum weekly average≤ 100.4 kg/dall yearD017
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD017
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD017
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD017
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD017
Phosphorus, total [as P]monthly average≤ 1 mg/LJun–SepD017
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, DecD017
Phosphorus, total [as P]monthly average≤ 3 kg/dJun–SepD017
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD017
Phosphorus, total [as P]annual total≤ 815 kg/yrall yearD017
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD017
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD017
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD017
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD017
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD017
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD017
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctD017
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD017
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD017
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD017
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD017
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD017
BOD, carbonaceous [5 day, 20 C]monthly average≤ 55.8 kg/dall yearD017
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 33.5 kg/dall yearD017
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD017
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD017
Precipitation, total defined period/inmonthly totalreport only (in)all yearS018
pHmonthly minimumreport only (SU)all yearS018
pHmonthly maximumreport only (SU)all yearS018
Solids, total suspendedmonthly averagereport only (mg/L)all yearS018
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS018
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS018
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS018
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS018
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS018
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS018
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS018

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/MN0055981 · MCP: https://passage-data.com/mcp