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Preston city of

Sewage treatment plant, Preston, Minnesota. NPDES permit MN0020745, in force until Jul 31, 2027. Last 12 months: over a limit 2 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D015 form A1 monthly (38 values), outfall D015 form A2 monthly (2 values), outfall S017 form A1 monthly (15 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

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

Period endingParameterReportedLimitOver by
June 2026Chlorine, total residual, daily maximum.85≤ .038 mg/L2137%
July 2026Chlorine, total residual, daily maximum.73≤ .038 mg/L1821%

Limits in force (55)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)Mar, SepD015
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD015
pHmonthly minimum≥ 6 SUall yearD015
pHmonthly maximum≤ 9 SUall yearD015
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)Mar, SepD015
Solids, total suspendedmonthly averagereport only (mg/L)May, SepD015
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD015
Solids, total suspendeddaily maximumreport only (mg/L)May, SepD015
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD015
Solids, total suspendedmonthly average≤ 44 kg/dall yearD015
Solids, total suspendedmaximum weekly average≤ 67 kg/dall yearD015
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD015
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD015
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD015
Calcium, total [as Ca]monthly maximumreport only (mg/L)Mar, SepD015
Magnesium, total [as Mg]monthly maximumreport only (mg/L)Mar, SepD015
Sodium, total [as Na]monthly maximumreport only (mg/L)Mar, SepD015
Potassium, total [as K]monthly maximumreport only (mg/L)Mar, SepD015
Chloride [as Cl]monthly maximumreport only (mg/L)Mar, SepD015
Sulfate, total [as SO4]monthly maximumreport only (mg/L)Mar, SepD015
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)Mar, SepD015
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD015
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD015
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD015
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD015
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD015
Solids, total dissolvedmonthly maximumreport only (mg/L)Mar, SepD015
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepD015
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)May, SepD015
Mercury, total [as Hg]monthly average≤ 9.7 ng/LMay, SepD015
Mercury, total [as Hg]daily maximum≤ 16.8 ng/LMay, SepD015
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD015
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD015
BOD, carbonaceous [5 day, 20 C]monthly average≤ 37 kg/dall yearD015
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 59 kg/dall yearD015
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD015
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD015
Precipitation, total defined period/inmonthly totalreport only (in)all yearS017
pHmonthly minimumreport only (SU)all yearS017
pHmonthly maximumreport only (SU)all yearS017
Solids, total suspendedmonthly averagereport only (mg/L)all yearS017
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS017
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS017
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS017
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS017
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS017
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS017
Mercury, total [as Hg]monthly averagereport only (ng/L)May, SepS017
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS017
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS017

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/MN0020745 · MCP: https://passage-data.com/mcp