We have established a Vessel Sewage No Discharge Zone (NDZ) for Puget Sound and certain adjoining waters. The NDZ is a body of water where boats may not release sewage, whether treated or not. It helps protect public health, water quality, and sensitive resources. The NDZ (Chapter 173-228 WAC) was adopted on April 9, 2018, after a five year public process and approval from the Environmental Protection Agency (EPA). The rule was effective May 10, 2018. However, certain commercial vessels have a five year delay before the rule begins. There is no change for graywater discharges. For more information, visit Ecology's NDZ webpage.