United States Gypsum Company

NPDES permit MI0002437 · Minor NON-POTW · effective, expires 2028-10-01 · EPA's file as of 2026-09-19

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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.

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

2values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Sulfide, dissolved, [as S] (2).

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 (37)

OutfallParameterStatisticLimitMonths
009Temperature, water deg. fahrenheitDAILY MX report only all year
009ConductivityDAILY MX report only all year
009pHDAILY MN >= 6.5 SU all year
009pHDAILY MX <= 9 SU all year
009Solids, total suspendedMO AVG <= 20 mg/L all year
009Solids, total suspendedDAILY MX <= 30 mg/L all year
009Sulfide, dissolved, [as S]MO AVG <= 24 ug/L Oct, Nov
009Sulfide, dissolved, [as S]MO AVG <= 25 ug/L Apr
009Sulfide, dissolved, [as S]MO AVG <= 22 ug/L Jan, Feb, Mar, Dec
009Sulfide, dissolved, [as S]MO AVG <= 29 ug/L May, Jun, Jul, Aug, Sep
009Sulfide, dissolved, [as S]DAILY MX <= 38 ug/L Oct, Nov
009Sulfide, dissolved, [as S]DAILY MX <= 40 ug/L Apr
009Sulfide, dissolved, [as S]DAILY MX <= 36 ug/L Jan, Feb, Mar, Dec
009Sulfide, dissolved, [as S]DAILY MX <= 48 ug/L May, Jun, Jul, Aug, Sep
009Sulfide, dissolved, [as S]MO AVG <= 1.1 lb/d Oct, Nov
009Sulfide, dissolved, [as S]MO AVG <= 1.1 lb/d Apr
009Sulfide, dissolved, [as S]MO AVG <= 1 lb/d Jan, Feb, Mar, Dec
009Sulfide, dissolved, [as S]MO AVG <= 1.3 lb/d May, Jun, Jul, Aug, Sep
009Sulfide, dissolved, [as S]DAILY MX <= 1.8 lb/d Oct, Nov
009Sulfide, dissolved, [as S]DAILY MX <= 1.8 lb/d Apr
009Sulfide, dissolved, [as S]DAILY MX <= 1.7 lb/d Jan, Feb, Mar, Dec
009Sulfide, dissolved, [as S]DAILY MX <= 2.2 lb/d May, Jun, Jul, Aug, Sep
009Chloride [as Cl]DAILY MX report only all year
009Sulfate, total [as SO4]DAILY MX report only all year
009Toxicity, choice of speciesMO AVG report only all year
009Toxicity, choice of speciesVALUE report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
009Outfall observation,visual, y/n responseVALUE report only all year
009TU Static 24 Hr Acute Pimephales promelasDAILY MX report only all year
009Static 48 Hr Chronic Pimphales PromelasMO AVG report only all year
009Static 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