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United States Gypsum Company

Miscellaneous Nonmetallic Minerals, Tawas City, Michigan. NPDES permit MI0002437, in force until Oct 1, 2028. Last 12 months: over a limit 2 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (25 values)
Renewal application due
Apr 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 21 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Sulfide, dissolved, [as S], daily maximum2.2≤ 1.8 lb/d22%
April 2026Sulfide, dissolved, [as S], monthly average1.8≤ 1.1 lb/d64%

Limits in force (37)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Conductivitydaily maximumreport only (umho/cm)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Sulfide, dissolved, [as S]monthly average≤ 24 ug/LOct, Nov
Sulfide, dissolved, [as S]monthly average≤ 25 ug/LApr
Sulfide, dissolved, [as S]monthly average≤ 22 ug/LJan, Feb, Mar, Dec
Sulfide, dissolved, [as S]monthly average≤ 29 ug/LMay–Sep
Sulfide, dissolved, [as S]daily maximum≤ 38 ug/LOct, Nov
Sulfide, dissolved, [as S]daily maximum≤ 40 ug/LApr
Sulfide, dissolved, [as S]daily maximum≤ 36 ug/LJan, Feb, Mar, Dec
Sulfide, dissolved, [as S]daily maximum≤ 48 ug/LMay–Sep
Sulfide, dissolved, [as S]monthly average≤ 1.1 lb/dOct, Nov
Sulfide, dissolved, [as S]monthly average≤ 1.1 lb/dApr
Sulfide, dissolved, [as S]monthly average≤ 1 lb/dJan, Feb, Mar, Dec
Sulfide, dissolved, [as S]monthly average≤ 1.3 lb/dMay–Sep
Sulfide, dissolved, [as S]daily maximum≤ 1.8 lb/dOct, Nov
Sulfide, dissolved, [as S]daily maximum≤ 1.8 lb/dApr
Sulfide, dissolved, [as S]daily maximum≤ 1.7 lb/dJan, Feb, Mar, Dec
Sulfide, dissolved, [as S]daily maximum≤ 2.2 lb/dMay–Sep
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Toxicity, choice of speciesmonthly averagereport only (tox chronic)all year
Toxicity, choice of speciesvaluereport only (tox chronic)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)all year
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year
TU Static 24 Hr Acute Pimephales promelasdaily maximumreport only (tox acute)all year
Static 48 Hr Chronic Pimphales Promelasmonthly averagereport only (tox chronic)all year
Static 48 Hr Chronic Pimphales Promelasdaily maximumreport only (tox chronic)all year

How strict are these limits?

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

Same industry: the 17 Mining and Quarrying of Nonmetallic Minerals permits in Michigan.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0002437 · MCP: https://passage-data.com/mcp