All of the Florida keys are NOT a NDZ. The CFR is very specific. See below. I have highlighted the specific area.
ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 140
[FRL–7212–4]
Marine Sanitation Devices (MSDs);
Regulation to Establish a No Discharge
Zone (NDZ) for State Waters within the
Boundary of the Florida Keys National
Marine Sanctuary (FKNMS)
AGENCY: Environmental Protection
Agency (EPA).
ACTION: Final rule.
SUMMARY: EPA is establishing a NDZ for
State waters within the boundaries of
the FKNMS pursuant to section 312
(f)(4)(A) of the Clean Water Act. This
action is being taken in response to an
October 27, 1999, resolution passed by
the FKNMS Water Quality Protection
Program Steering Committee and a
December 8, 1999, resolution of the
Board of County Commissioners of
Monroe County, Florida to establish a
NDZ area for State waters within the
FKNMS. These resolutions led to a
December 7, 2000, letter from Governor
Jeb Bush of Florida requesting this
action.