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Elk River city of

Sewage treatment plant, major discharger, Elk River, Minnesota. NPDES permit MN0020788 expired Apr 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D014 form A1 monthly (29 values), outfall D014 form A2 monthly (2 values), outfall D014 form A3 monthly (2 values), outfall S015 form A1 monthly (15 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 42 reports late

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD014
pHmonthly minimum≥ 6 SUall yearD014
pHmonthly maximum≤ 9 SUall yearD014
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, NovD014
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD014
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD014
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD014
Solids, total suspendedmonthly average≤ 118 kg/dall yearD014
Solids, total suspendedmaximum weekly average≤ 177 kg/dall yearD014
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD014
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD014
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD014
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD014
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD014
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD014
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD014
Phosphorus, total [as P]annual total≤ 2431 kg/yrall yearD014
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLall yearD014
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD014
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD014
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD014
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD014
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD014
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovD014
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, NovD014
Mercury, total [as Hg]monthly average≤ 6.9 ng/LJan, Mar, May, Jul, Sep, NovD014
Mercury, total [as Hg]daily maximum≤ 6.9 ng/LJan, Mar, May, Jul, Sep, NovD014
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD014
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD014
BOD, carbonaceous [5 day, 20 C]monthly average≤ 98 kg/dall yearD014
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 157 kg/dall yearD014
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD014
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD014
Precipitation, total defined period/inmonthly totalreport only (in)all yearS015
pHmonthly minimumreport only (SU)all yearS015
pHmonthly maximumreport only (SU)all yearS015
Solids, total suspendedmonthly averagereport only (mg/L)all yearS015
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS015
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS015
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS015
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS015
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS015
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS015
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS015
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS015
Mercury, total [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovS015
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS015
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS015

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/MN0020788 · MCP: https://passage-data.com/mcp