Passage Data · Check a report · Use it from your AI

Project Oceanology

Industrial or other facility, Groton, Connecticut. NPDES permit CT0030562, in force until Sep 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 31 days after each period: form 1 monthly (6 values)
Renewal application due: Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 2 reports late

Limits in force (6)

Parameter	Statistic	Limit	Months
pH	instantaneous minimum	≥ 6.8 SU	Mar, Sep
pH	instantaneous maximum	≤ 8 SU	Mar, Sep
Solids, total suspended	instantaneous maximum	report only (mg/L)	Mar, Sep
Nitrogen, total [as N]	instantaneous maximum	report only (mg/L)	Mar, Sep
Phosphorus, total [as P]	instantaneous maximum	report only (mg/L)	Mar, Sep
Flow	daily maximum	report only (gal/d)	Mar, Sep

How strict are these limits?

pH, instantaneous minimum at least 6.8 SU — stricter than 95% of 24 other minor industrial and other permits in Connecticut; 4% have the same limit
pH, instantaneous maximum 8 SU — stricter than 83% of 24 other minor industrial and other permits in Connecticut; 17% have the same limit

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

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CT0030562 · MCP: https://passage-data.com/mcp