Si Environmental serves as the water/ wastewater utility operator for Harris County MUD 419.
To register your account online or to pay your bill, click here
Customer Support
For billing, service requests and other inquiries use the following:
General Customer Service Number: (832) 490-1600
Customer/Billing Inquiries Email: customercare@sienv.com
For general phone inquiries, please contact our Customer Service department Monday through Friday from 8:30 a.m. to 5:00 p. m., with the exception of holidays.
Our payment hours are:
Main Office
6420 Reading Road
Rosenberg, TX 77471
Phone: 832-490-1600
Monday through Friday from 8:00 a.m. to 5:00 p.m.
For after-hour emergencies, please contact our dispatch team at 832-490-1601.
Service Rates:
Water Rate (Single Family Residential)
| $ 18.00 | Minimum Rate for Service |
| $ 1.75 | Rate per 1,000 gallons metered for usage between 5,001 gallons and 10,000 gallons |
| $ 2.00 | Rate per 1,000 gallons metered for usage between 10,001 gallons and 20,000 gallons |
| $ 2.50 | Rate per 1,000 gallons metered for usage above 20,001 gallons |
Sewer Rate (Single Family Residential)
| $ 58.98 | Minimum Rate for Service |
West Harris County Regional Water Authority Groundwater Reduction Plan Fee
| $ 4.64 | Rate per 1,000 gallons of metered usage |