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Prairie Island Community WWSL

Sewage treatment plant, Welch, Minnesota. NPDES permit MN0061336 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 3 times (last June 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: form A quarterly (39 values), form P quarterly, form SA twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
6 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
March 2026Solids, suspended percent removal, minimum % removal71 %≥ 85 %93%
May 2026Solids, suspended percent removal, minimum % removal83 %≥ 85 %13%
June 2026Solids, suspended percent removal, minimum % removal74 %≥ 85 %73%

Limits in force (70)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport 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≤ 34 kg/dall year
Solids, total suspendedmonthly average≤ 34 kg/dall year
Solids, total suspendedweekly average≤ 51 kg/dall year
Solids, total suspendedweekly average≤ 51 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly 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, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ .6 mg/Lall year
Phosphorus, total [as P]monthly average≤ .6 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≤ .68 kg/dall year
Phosphorus, total [as P]monthly average≤ .68 kg/dall year
Phosphorus, total [as P]weekly average≤ 1.81 kg/dall year
Phosphorus, total [as P]weekly average≤ 1.81 kg/dall 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 plantmonthly averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ .038 mg/Lall year
Chlorine, total residualdaily maximum≤ .038 mg/Lall year
E. coli30-day geometric mean≤ 126 #/100mLMar–Oct
E. coli30-day geometric mean≤ 126 #/100mLMar–Oct
E. colidaily maximum≤ 410 #/100mLMar–Oct
E. colidaily maximum≤ 410 #/100mLMar–Oct
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)Apr, Oct
Mercury, total [as Hg]daily 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≤ 28.4 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 28.4 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 45.4 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 45.4 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 (kg/d)all year
BOD, carb-5 day, 20 deg C, percent removalminimum % removal≥ 85 %all year
BOD, carb-5 day, 20 deg C, percent removalminimum % removal≥ 85 %all year
Solids, suspended percent removalminimum % removal≥ 85 %all year
Solids, suspended percent removalminimum % removal≥ 85 %all year
Outfall observation,visual, y/n responsevaluereport only (Y=0;N=1)all year
Outfall observation,visual, y/n responsevaluereport only (Y=0;N=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/MN0061336 · MCP: https://passage-data.com/mcp