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United States Gypsum Co.

Gypsum Products, Southard, Oklahoma. NPDES permit OK0038806, in force until Feb 28, 2030. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (11 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 1 of 17 reports late

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

Period ending	Parameter	Reported	Limit
July 2026	pH, maximum	9.35 SU	≤ 9 SU

Limits in force (11)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Nitrogen, nitrate total [as N]	monthly average	≤ 10.63 mg/L	all year
Nitrogen, nitrate total [as N]	daily maximum	≤ 18.42 mg/L	all year
Nitrogen, nitrate total [as N]	monthly average	≤ 12.5 lb/d	all year
Nitrogen, nitrate total [as N]	daily maximum	≤ 21.7 lb/d	all year
Sulfate, total [as SO4]	monthly average	≤ 2946 mg/L	all year
Sulfate, total [as SO4]	daily maximum	≤ 2975 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year

How strict are these limits?

Nitrogen, nitrate total [as N], daily maximum 18.42 mg/L — stricter than 40% of 104 other minor industrial and other permits nationwide
Sulfate, total [as SO4], daily maximum 2975 mg/L — stricter than 39% of 280 other minor industrial and other permits nationwide
Solids, total suspended, daily maximum 45 mg/L — stricter than 14% of 104 other minor industrial and other permits in Oklahoma; 35% have the same limit

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

Same industry: the 7 Stone, Clay, Glass and Concrete Products permits in Oklahoma.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0038806 · MCP: https://passage-data.com/mcp