Chat live with Customer Relations.M-F 8AM-5PM By Phone 24/7 (949) 459-6420To ensure security we can only accept credit card payments via our automated telephone system or this portal. Mail Payment Santa Margarita Water DistrictP.O. Box 51238Los Angeles, CA 90051-5538 In Person Santa Margarita Water District26111 Antonio ParkwayRancho Santa Margarita, CA 92688 After Hours 26111 Antonio ParkwayRancho Santa Margarita, CA 92688Night-drop mailbox located outside near the flagpole. Payments recorded next business day. Having Trouble Paying Your Water Bill? You may qualify for assistance. Please contact Orange County 211 or dial 2-1-1.