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Hannahville Community WWTP

Sewage treatment plant, Wilson, Michigan. NPDES permit MI0057366 expired Apr 19, 2025; its limits still apply. Last 12 months: over a limit 9 times (last June 2026), 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A quarterly (35 values), form SM quarterly (1 value), form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, 20 deg. C, monthly average42.5 lb/d≤ 38 lb/d12%
March 2026BOD, 5-day, 20 deg. C, weekly average68.9 lb/d≤ 58 lb/d19%
March 2026Solids, total suspended, monthly average26.7 mg/L≤ 20 mg/L34%
March 2026Solids, total suspended, monthly average59.6 lb/d≤ 38 lb/d57%
March 2026Solids, total suspended, weekly average53 mg/L≤ 30 mg/L77%
March 2026Solids, total suspended, weekly average77.2 lb/d≤ 58 lb/d33%
April 2026BOD, 5-day, 20 deg. C, monthly average46.3 lb/d≤ 38 lb/d22%
June 2026Solids, total suspended, weekly average40.8 mg/L≤ 30 mg/L36%
June 2026pH, daily maximum8.56 SU≤ 8 SU—

Limits in force (40)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 38 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 58 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 8 SUall year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedweekly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 38 lb/dall year
Solids, total suspendedweekly average≤ 58 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/LMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 29 lb/dMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dJan, Feb, Mar, Apr, Oct, Nov, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]weekly average≤ 2 mg/Lall year
Phosphorus, total [as P]monthly average≤ 1.92 lb/dall year
Phosphorus, total [as P]weekly average≤ 3.8 lb/dall year
Phosphorus, total [as P]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 plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]rolling average≤ 3 ng/Lall year
Mercury, total [as Hg]rolling average≤ .000058 lb/dall year
Mercury, total [as Hg]annual averagereport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (ng/L)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: Michigan'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/MI0057366 · MCP: https://passage-data.com/mcp