The new tougher water restrictions will also have an effect on people washing down their boats at boat ramps.
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NSW Maritime Executive Director Mark Hutchings said people using Lake Illawarra or other waterways in the region can now only use trigger nozzle hoses to wash boats and other equipment.
"Hoses at boat ramps must be fitted with trigger nozzles and connected to a timer that shuts off the water after 10 minutes with penalties for those who are found to not be complying," Mr Hutchings said.
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"These new restrictions, which apply until further notice, will require some additional planning by boaties, but keep in mind these new restrictions are in place as dam levels have dropped to 45 per cent - even earlier than predicted."
Boaters can flush motors with a bucket or a purpose-designed flushing device connected to a hose and fill water tanks on a boat using a hose, as long as the hose is not left unattended or the tank left to overflow.
Bilges can be cleaned using a high-pressure cleaning device or hose fitted with a trigger nozzle.