Inicio Go Paperless, Save Time By Registering for Mesa Water’s Online Billing Service Go Paperless, Save Time By Registering for Mesa Water’s Online Billing Service Posted: Tuesday, October 29, 2019 If you haven’t already, register for Mesa Water’s new online billing service, offering more ways to view and pay your bill, including the convenient AutoPay feature. Visit our website today for a step-by-step guide on how to register. For further assistance, please contact Customer Services at 949.631.1200, Monday - Thursday 7:30 a.m. - 5:00 p.m., and Friday 8:00 a.m. - 5:00 p.m.