Denver Water proudly serves high-quality water and promotes its efficient use to 1.4 million people in the city of Denver and many surrounding suburbs. Established in 1918, the utility is a public agency funded by water rates and new tap fees, not taxes. It is Colorados oldest and largest water utility.Were here to help. Start or stop your water service. Find out how to check for costly leaks. Learn about homeowner responsibility. Contact Customer Care at 303-893-2444, Monday Friday, 7:30 a.m. 5:30 p.m. After hours emergency service is available at 303-628-6801.