According to a post from the City of Watertown, WI Government, property tax bills will be mailed out this week. Payments should be made by mail or via the drop box outside City Hall. Credit cards can also be used through paymentservicesnetwork.com. You can get a receipt if you include a self addressed and stamped envelope in the mail with your payment. For more information, visit the City of Watertown, WI Government Facebook page.