Residents can water their lawns only every other day between 4 p.m. and 10 a.m., and can't hose sidewalks and driveways under new rationing rules adopted Monday.
Also, motor vehicles, trailers and boats can be washed only with hoses equipped with shut-off nozzles.
The measures, which will take effect at the end of this week, are the first phase of a three-phase mandatory conservation program adopted by the City Council.
Thomas M. Mayer, acting city engineer, said the city will rely on people's "good-faith effort to comply and complaints from neighbors who are conserving." Code enforcement officers will issue citations to violators, he added.
First violations will result in written warnings. Second-time violators will pay an additional 50% of the total water bill. Subsequent violations will result in a flow restricter on water meters for up to 48 hours.