Byrnes Mill is served by two (2) water districts; Public Water Supply District #2 and Public Water Supply District #6.  It's a good idea to contact the District that serves your area to ensure that service is set-up to your home/property.  

Public Water Supply District #2
195 Old Sugar Creek Rd
High Ridge, MO 63049
(636) 326-0200
(636) 343-5863 (fax)

Public Water Supply District #6
6000 Kingsway Drive
House Springs, MO 63051
(636) 671-4096
(636) 671-0207 (fax)