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Seacrest Marine Holdings LLC

Ship Building And Repairing, North Charleston, South Carolina. NPDES permit SC0048518 expired May 31, 2020; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 29 days after each period: form 1 monthly (9 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (9)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	daily maximum	≤ 20 mg/L	all year
Oxygen demand, chem. [high level] [COD]	daily maximum	report only (mg/L)	all year
pH	instantaneous minimum	≥ 6.5 SU	all year
pH	instantaneous maximum	≤ 8.5 SU	all year
Solids, total suspended	daily maximum	≤ 40 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
Duration of discharge	daily maximum	≤ 4 d	all year
Discharge event observation [Visual Monitoring]	daily maximum	≤ 15 occur/mo	all year

How strict are these limits?

Solids, total suspended, daily maximum 40 mg/L — stricter than 88% of 85 other minor industrial and other permits in South Carolina; 6% have the same limit
pH, instantaneous minimum at least 6.5 SU — stricter than 87% of 62 other minor industrial and other permits in South Carolina; 13% have the same limit
BOD, 5-day, 20 deg. C, daily maximum 20 mg/L — stricter than 72% of 70 other minor industrial and other permits in South Carolina; 24% have the same limit

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

Same industry: the 3 Transportation Equipment permits in South Carolina.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0048518 · MCP: https://passage-data.com/mcp