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Greenfield Environmental Multistate Trust LLC-Skull Ck

Sanitary Services, Cushing, Oklahoma. NPDES permit OK0044598, in force until Feb 28, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (8 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	report only (mg/L)	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Oil and grease, hexane extr method	monthly average	report only (mg/L)	all year
Oil and grease, hexane extr method	daily maximum	≤ 15 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

How strict are these limits?

Oil and grease, hexane extr method, daily maximum 15 mg/L — stricter than 28% of 35 other minor industrial and other permits in Oklahoma; 71% have the same limit
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 4 Sanitary Services 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/OK0044598 · MCP: https://passage-data.com/mcp