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ML Wastewater Management, Inc

Sewage treatment plant, Onamia, Minnesota. NPDES permit MN0064637, in force until Nov 15, 2029. Last 12 months: over a limit 5 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: form A quarterly (68 values), form Q quarterly (6 values), form SA twice a year (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average1.05 mg/L≤ .8 mg/L31%
October 2025Phosphorus, total [as P], weekly average1.86 mg/L≤ 1.6 mg/L16%
July 2026Chloride [as Cl], monthly average263 mg/L≤ 250 mg/L5%
August 2026Chloride [as Cl], monthly average258 mg/L≤ 250 mg/L3%
September 2026Phosphorus, total [as P], monthly average.96 mg/L≤ .8 mg/L20%

Limits in force (76)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 71 kg/dall year
Solids, total suspendedmonthly average≤ 71 kg/dall year
Solids, total suspendedweekly average≤ 106 kg/dall year
Solids, total suspendedweekly average≤ 106 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Nitrogen, total [as N]reported averagereport only (mg/L)all year
Nitrogen, total [as N]reported averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]reported averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]reported averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]reported averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]reported averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ .8 mg/Lall year
Phosphorus, total [as P]monthly average≤ .8 mg/Lall year
Phosphorus, total [as P]weekly average≤ 1.6 mg/Lall year
Phosphorus, total [as P]weekly average≤ 1.6 mg/Lall year
Phosphorus, total [as P]monthly average≤ 1.9 kg/dall year
Phosphorus, total [as P]monthly average≤ 1.9 kg/dall year
Phosphorus, total [as P]weekly average≤ 3.8 kg/dall year
Phosphorus, total [as P]weekly average≤ 3.8 kg/dall year
Chloride [as Cl]monthly average≤ 250 mg/Lall year
Chloride [as Cl]monthly average≤ 250 mg/Lall year
Chloride [as Cl]weekly average≤ 500 mg/Lall year
Chloride [as Cl]weekly average≤ 500 mg/Lall year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct
E. colimaximum≤ 410 #/100mLApr–Oct
E. colimaximum≤ 410 #/100mLApr–Oct
Mercury, total [as Hg]maximumreport only (ng/L)all year
Mercury, total [as Hg]maximumreport only (ng/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 59 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 59 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 94 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 94 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (kg/d)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (kg/d)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Outfall observation,visual, y/n responsemonthly averagereport only (N=0;Y=1)all year
Outfall observation,visual, y/n responsemonthly averagereport only (N=0;Y=1)all year

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/MN0064637 · MCP: https://passage-data.com/mcp