To register your account online or to pay your bill, visit sienv.firstbilling.com
For billing, service requests and other inquiries us the following:
General Customer Service Number: (832) 490-1600
Customer/Billing Inquiries Email: CustomerCare@sienv.com
For general phone inquiries, please contact Si Environmental Customer Service department Monday through Friday from 8:00 a.m. to 5:00 p. m., with the exception of holidays.
For after-hour emergencies, please contact Si Environmental Dispatch team at 832-490-1601.