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Blackwell Zinc Company, Inc.

Sanitary Services, Blackwell, Township Of, Oklahoma. NPDES permit OK0044962, in force until Sep 30, 2030. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (10 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (10)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Cadmium, total [as Cd]	monthly average	≤ 27.9 ug/L	all year
Cadmium, total [as Cd]	daily maximum	≤ 60.1 ug/L	all year
Lead, total [as Pb]	monthly average	≤ 5 ug/L	all year
Lead, total [as Pb]	daily maximum	≤ 12.4 ug/L	all year
Zinc, total [as Zn]	monthly average	report only (ug/L)	all year
Zinc, total [as Zn]	daily maximum	report only (ug/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?

Lead, total [as Pb], daily maximum 12.4 ug/L — stricter than 66% of 277 other minor industrial and other permits nationwide
Lead, total [as Pb], monthly average 5 ug/L — stricter than 60% of 40 other minor industrial and other permits nationwide; 8% have the same limit
Cadmium, total [as Cd], daily maximum 60.1 ug/L — stricter than 40% of 86 other minor industrial and other permits nationwide

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

Same industry: the 4 Sanitary Services permits in Oklahoma.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0044962 · MCP: https://passage-data.com/mcp