The Clean Water action (CWA) is the centerpiece that federal legislation addressing air pollution in U.S. Waters. Under section 312 that the CWA, ship sewage may be controlled through the facility of locations in which discharges of sewage from vessels space not allowed. These locations are likewise known together "no-discharge zones" (NDZs).

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What is an NDZ because that vessel sewage?

An NDZ is one area in which both treated and untreated sewer discharges indigenous vessels space prohibited. In ~ NDZ boundaries, vessel operators are forced to maintain their sewage discharges onboard because that discharge at sea (beyond 3 miles from shore) or onshore in ~ a pump-out facility.

How is one area designated together an NDZ under the CWA?

The CWA list three circumstances where a state may initiate the process to create an NDZ:

The state determines the the water body needs greater ecological protection, and also find that adequate pump-out framework are available. (Commonly known as a 312(f)(3) NDZ) A state may fully prohibit sewage discharge from vessels, even if it is the sewer is treated or not, right into some or every one of its waters if:the state determines the the protection and enhancement that the quality of the waterbody calls for greater ecological protection 보다 the current federal standards allow; and

Who enforces the NDZ requirements?

Under ar 312 that the CWA, the U.S. Coast Guard and the state in which the NDZ has actually been designated may enforce the NDZ requirements. (33 U.S.C. 1322(k) (PDF)(10 pp, 170 K)). 

How does a ship operator comply with an NDZ?

The requirements for vessel operators are described in 33 CFR 159.7(b)-(c) (PDF) (2 pp, 190 K). The regulations allow for four methods that securing a form I or II marine sanitation maker (MSD) while in one NDZ, including:

Closing the seacock and removing the handle;Padlocking the seacock in the closed position;Using a non-releasable wire-tie to host the seacock in the closed position; orLocking the door come the an are enclosing the toilets v a padlock or door handle vital lock.

For type III devices, the following options are available:

Closing valves causing overboard discharge and removing the handle;Padlocking any type of valves causing overboard discharge in the closed position; orHolding overboard discharge valves closed utilizing a non-releasable wire-tie.

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Which states have NDZs?

A number of states have designated some or all of their surface waters as NDZs. A perform of created NDZs might be discovered at No-Discharge zones by State. Visit the No-Discharge zones Map webpage to see an interactive GIS map of every designated NDZs, as well.