Great Lakes Aggregate-Sylvania

NPDES permit MI0044491 · Major NON-POTW · expired, expires 2018-10-01 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2018-10-01 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

16values over a limit
103required values missing, on 10 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Hydrogen peroxide (11), Hydrogen sulfide (4), pH (1).

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MI permits in EPA's filings — check your permit).

Limits in force (33)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. fahrenheitMO AVG report only all year
002Temperature, water deg. fahrenheitDAILY MX report only all year
002ConductivityMO AVG report only all year
002ConductivityDAILY MX report only all year
002Hydrogen peroxideMO AVG <= 19 ug/L all year
002Hydrogen peroxideDAILY MX report only all year
002Hydrogen peroxideMO AVG <= 1.9 lb/d all year
002Hydrogen peroxideDAILY MX report only all year
002Oxygen, dissolved [DO]DAILY MN >= 4 mg/L all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedMO AVG <= 25 mg/L all year
002Solids, total suspendedDAILY MX <= 45 mg/L all year
002Sulfide, dissolved, [as S]MO AVG report only all year
002Sulfide, dissolved, [as S]DAILY MX report only all year
002Chloride [as Cl]DAILY MX report only all year
002Sulfate, total [as SO4]MO AVG report only all year
002Sulfate, total [as SO4]DAILY MX report only all year
002Strontium, total [as Sr]DAILY MX report only all year
002Lithium, total [as Li]DAILY MX report only all year
002Selenium, total [as Se]DAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Solids, total dissolvedMO AVG report only all year
002Solids, total dissolvedDAILY MX report only all year
002Hydrogen sulfideMO AVG <= .69 ug/L all year
002Hydrogen sulfideDAILY MX <= 6.4 ug/L all year
002Hydrogen sulfideMO AVG <= .069 lb/d all year
002Hydrogen sulfideDAILY MX <= .64 lb/d all year
002Outfall observation,visual, y/n responseVALUE report only all year
002TU Static 24 Hr Acute Pimephales promelasDAILY MX report only all year
002Static 48 Hr Chronic Pimphales PromelasMO AVG <= 2.1 tox chronic all year
002Static 48 Hr Chronic Pimphales PromelasDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states