Passage Data · Check a report · Use it from your AI

Niles WWTP

Sewage treatment plant, major discharger, Niles, Michigan. NPDES permit MI0023701 expired Oct 1, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (24 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (24)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmaximum monthly average≤ 1500 lb/dall year
Solids, total suspended7-day average≤ 2200 lb/dall year
Phosphorus, total [as P]maximum monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]maximum monthly average≤ 48 lb/dall year
Flow, in conduit or thru treatment plantmaximum monthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .038 mg/Lall year
Mercury, total [as Hg]maximum monthly averagereport only (ng/L)all year
Mercury, total [as Hg]maximum monthly averagereport only (lb/d)all year
Mercury, total [as Hg]12-month average≤ 3 ng/Lall year
Mercury, total [as Hg]12-month average≤ .00015 lb/dall year
Coliform, fecal generalmaximum monthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmaximum 7-day geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]maximum monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum monthly average≤ 1200 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1900 lb/dall year
BOD, carb-5 day, 20 deg C, percent removalminimum % removal≥ 76 %all year
Solids, suspended percent removalminimum % removal≥ 76 %all year

How strict are these limits?

Cited limits by parameter: Michigan's rules and the federal ones.

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0023701 · MCP: https://passage-data.com/mcp