LINCOLN, Neb. (AP) — Lincoln police officers have ticketed several dozen people who were watering lawns or washing cars when they weren’t supposed to.

Police spokeswoman Katie Flood said Tuesday that the department’s system registered 58 citations by the end of Monday, but she’s certain more citations were issued but not yet entered.

Historically low water flow in the Platte River prompted Lincoln to issue mandatory restrictions on outdoor water use for lawns and car washing. The water cutbacks were voluntary at first, and then mandatory restrictions began Aug. 9. Police had been issuing only warnings until Monday.

Outdoor watering isn’t permitted on Mondays. Home addresses ending in even numbers must limit outdoor watering to Wednesdays, Fridays and Sundays and addresses ending in odd numbers must water only on Tuesdays, Thursdays and Saturdays.