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NPS Cinnamon Bay Reverse Osmosis Plant

Federal facility, St. John, the U.S. Virgin Islands. NPDES permit VI0000615, in force until Jan 31, 2028. Last 12 months: no values over a limit, 7 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 31 days after each period: form A monthly (7 values), form Q quarterly
Renewal application due: Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 7 of 16 reports late

Limits in force (10)

Parameter	Statistic	Limit	Months
Temperature, water deg. centigrade	daily maximum	≤ 32 deg C	all year
Oxygen, dissolved [DO]	minimum	≥ 5.5 mg/L	all year
Oxygen, dissolved [DO]	daily maximum	report only (mg/L)	all year
pH	minimum	≥ 7 SU	all year
pH	maximum	≤ 8.3 SU	all year
Salinity	daily maximum	report only (ppk)	all year
Oil & Grease	daily maximum	report only (mg/L)	all year
Flow, in conduit or thru treatment plant	daily maximum	≤ .046 MGD	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Solids, total dissolved	daily maximum	report only (mg/L)	all year

How strict are these limits?

pH, minimum at least 7 SU — stricter than 99% of 208 other minor federal facilities nationwide
pH, maximum 8.3 SU — stricter than 98% of 201 other minor federal facilities nationwide
Oxygen, dissolved [DO], minimum at least 5.5 mg/L — stricter than 35% of 20 other minor federal facilities nationwide

Cited limits by parameter: we hold no rule of the U.S. Virgin Islands's own; the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VI0000615 · MCP: https://passage-data.com/mcp