Update 10:38 a.m. - All power has been restored in Water Mill, LIPA's outage map reports.
Update 9:42 a.m. - The number of outages in Water Mill has been reduced to 126, according to LIPA.
Long Island Power Authority reports that 850 customers are without power, with electricity estimated to be restored around 10:30 a.m.
A crew has been assigned to the task, according to lipower.org, though the website does not state the cause of the mass outage.
Check back for updates.