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Entergy Miss Inc, Grand Gulf Nuclear Station

Electric Services, major discharger, Port Gibson, Mississippi. NPDES permit MS0029521, in force until Apr 30, 2031. Last 12 months: no values over a limit, 9 of 102 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due

About 28 days after each period: outfall 001 form A monthly (13 values), outfall 004 form A monthly (9 values), outfall 005 form A monthly (9 values), outfall 006 form A monthly (6 values), outfall 007 form A monthly (8 values), outfall 010 form A monthly (10 values), and 6 more forms

Last report on file

September 2026

Oct 2024 – Sep 2025

0 values over a limit, 4 required values missing, 4 of 107 reports late

Limits in force (89)

How strict are these limits?

• Solids, total suspended, daily maximum 30 mg/L — stricter than 80% of 1,064 other major industrial and other permits nationwide; 12% have the same limit
• BOD, 5-day, 20 deg. C, daily maximum 45 mg/L — stricter than 38% of 355 other major industrial and other permits nationwide; 29% have the same limit
• E. coli, daily maximum 410 #/100mL — stricter than 34% of 64 other major industrial and other permits nationwide; 19% have the same limit

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

Same industry: the 20 Electric Services permits in Mississippi.

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0029521 · MCP: https://passage-data.com/mcp