Making a Payment Water and Sewer charges are billed by the District on the first working day of each month.  All bills are the responsibility of the property owner and remain their responsibility until the District is notified of a change in ownership of the property. There are several ways to pay your water and sewer bill: Mail your check or money order payable to TWSD at 410 Grand Avenue, Oroville, CA  95965.  Be sure to include your account number so that we may accurately credit your account. Pay by cash, check or credit card at the District office located at 410 Grand Avenue, Oroville. If paying by credit card, the District office is only set up to take MasterCard or Discover Card.   A third-party convenience fee will apply to cardholders who wish to pay via credit card.  This fee will be 2.45% ($1.50 Minimum). Office hours are 8:00 a.m. - 5:00 p.m. Monday - Friday Set up a "bill pay" account through your bank.  Be sure to include your account number so that we may accurately credit your account. Pay by Credit/Debit Card or E-Check by using the Official Payment link below.  A third-party convenience fee will apply to cardholders who wish to use this service.  The convenience fee is $3.95 per transaction up to a maximum payment amount of $250.00. Follow the instructions below to use the Official Payment link.   http://www.officialpayments.com                    Once you are on the Official Payment site, click on                         "Local Payments"                    Under State:  Use the drop down arrow to choose "California"                    Under Payment Entity:  Use the drop down arrow to choose                         "Thermalito Water and Sewer District"                    Click on "Make A Payment" at the bottom of the page to continue                         with making your payment. Please note that when paying online through Official Payments, the District will not be made aware of your credit card transaction until the following business day at which time the credit card amount will be posted to your account.  If you need to make the District aware of your transaction the day you submit it, you can fax a copy of your confirmation to 530-533-9243. Bills are due and payable upon receipt. If you have questions regarding your bill please contact the District Office at (530) 533-0740.