You can now pay your water and sewer bill online through Nebraska Interactive at this website: https://appengine.egov.com/apps/ne/gretna/gretna_utility_payments
Once you are on this site, you will see a screen like this:
To make a payment, click on account number at the bottom to enter your water billing account number. The follow the instructions on the next page. You have the option to pay by check or credit card. Please note that the customer will be charge the processing fees.