Homeowners will be allowed to water three days a week based on their address.
Durham leaders say they're trying to manage the Bull City's water supply.
Odd numbered addresses may water once on Tuesdays, Thursdays and Saturdays. Even numbered addresses can water on Sundays, Wednesdays and Fridays.
Watering must be done before 10 a.m. or after 6 p.m. and no one is allowed to water on Mondays.
The new outdoor irrigation schedule applies to all spray irrigation systems. Hand-watering and drip irrigations systems are not restricted.
In addition to the irrigation schedule, the new efficiency ordinance requires rain sensors or soil moisture sensors for all newly installed automated irrigation systems. Existing systems must install sensors by November 30, 2009.