Umicore Optical Materials USA, Inc — NPDES permit OKP003097: limits, due date and EPA's record

Optical Instruments And Lenses, Quapaw, Oklahoma. NPDES permit OKP003097, in force until Dec 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (25)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 5 SU	all year
pH	maximum	≤ 11 SU	all year
Cyanide, total [as CN]	monthly average	≤ .65 mg/L	all year
Cyanide, total [as CN]	daily maximum	≤ 1.2 mg/L	all year
Fluoride, total [as F]	monthly average	report only (mg/L)	all year
Fluoride, total [as F]	daily maximum	report only (mg/L)	all year
Arsenic, total [as As]	monthly average	report only (mg/L)	all year
Arsenic, total [as As]	daily maximum	report only (mg/L)	all year
Cadmium, total [as Cd]	monthly average	≤ .07 mg/L	all year
Cadmium, total [as Cd]	daily maximum	≤ .11 mg/L	all year
Chromium, total [as Cr]	monthly average	≤ 1.71 mg/L	all year
Chromium, total [as Cr]	daily maximum	≤ 2.77 mg/L	all year
Copper, total [as Cu]	monthly average	≤ 2.07 mg/L	all year
Copper, total [as Cu]	daily maximum	≤ 3.38 mg/L	all year
Lead, total [as Pb]	monthly average	≤ .43 mg/L	all year
Lead, total [as Pb]	daily maximum	≤ .69 mg/L	all year
Nickel, total [as Ni]	monthly average	≤ 2.38 mg/L	all year
Nickel, total [as Ni]	daily maximum	≤ 3.98 mg/L	all year
Silver, total [as Ag]	monthly average	≤ .24 mg/L	all year
Silver, total [as Ag]	daily maximum	≤ .43 mg/L	all year
Zinc, total [as Zn]	monthly average	≤ 1.48 mg/L	all year
Zinc, total [as Zn]	daily maximum	≤ 2.61 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (gal/d)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (gal/d)	all year
Total toxic organics [TTO] [40 CFR433]	daily maximum	≤ 2.13 mg/L	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/OKP003097 · MCP: https://passage-data.com/mcp