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Norfolk Southern Railway Company - Portsmouth Yard

Railroads, Line-Haul Operating, Portsmouth, Ohio. NPDES permit OH0005266, in force until Jun 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (10 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 (10)

Parameter	Statistic	Limit	Months
Flow rate	monthly average	report only (gal/d)	all year
Flow rate	daily maximum	report only (gal/d)	all year
Solids, total suspended	monthly average	≤ 15 mg/L	all year
Solids, total suspended	daily maximum	≤ 25 mg/L	all year
Oil and grease, hexane extr method	monthly average	≤ 10 mg/L	all year
Oil and grease, hexane extr method	daily maximum	≤ 10 mg/L	all year
Rainfall	monthly average	report only (in)	all year
Rainfall	daily maximum	report only (in)	all year
pH, maximum	daily maximum	≤ 9 SU	all year
pH, minimum	daily minimum	≥ 6.5 SU	all year

How strict are these limits?

Solids, total suspended, daily maximum 25 mg/L — stricter than 85% of 559 other minor industrial and other permits in Ohio
Oil and grease, hexane extr method, monthly average 10 mg/L — stricter than 42% of 42 other minor industrial and other permits in Ohio; 33% have the same limit
Solids, total suspended, monthly average 15 mg/L — stricter than 27% of 1,799 other minor industrial and other permits in Ohio; 1% have the same limit

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

Same industry: the 8 Railroad Transportation permits in Ohio.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0005266 · MCP: https://passage-data.com/mcp