New Billing Policy for Renters & Property Owners

Effective July 16, 2020, the District will no longer offer the option to transfer billing of water and/or sewer charges from the property owner of the property to a tenant/renter. The owner of record will be responsible for paying water and sewer charges.  Accounts that are currently setup with a tenant will remain in place until the tenant lease expires. Upon expiration of the existing lease the property billing will revert to the property owner. Thank you for your cooperation.

Sewer and Water Bill Calculator

If you would like to compare your bill using the current rates with the new sewer and water rates click on the link.  You will need your water usage from your quarterly water & sewer bill.

Sewer and Water Customer Billing Information

The District bills its customers for sewer and water services on a calendar quarter basis in arrears. Bills are mailed out the first week of January, April, July, and October of each year. The service charges for sewer and water are calculated from water meter readings which the District collects for each billable property.  Most of the water meters are connected by radio signal to a new fixed base meter system which gives hourly reads automatically.  Meters that are not read through this system are read manually at least once a quarter for billing purposes.

Contact Information

If you have questions about customer billing please contact:

Terry Smith

Water Meter Information

Please go to the water meter page for information about our water metering program. This page has information about reading your water meter and links to technical information about our meters.

Water Meter Page



Auto Pay

Even better – don’t worry about paying your bill at all!  Enroll in AutoPay.  Your bills will be automatically paid on the due date each billing cycle, using your default credit card or bank account. This will avoid any late fees and free you from having to remember when to pay.

Login to your account and click on AutoPay to enroll.

Late Payments & Penalties

The District provides at least a 45 day period in which customer payments must be received to be considered current.  The District bills in arrears therefore 45 days after billing customer accounts they are considered late and are subject to the District’s late fee policy from the day after billing. The District currently charges an annualized 12% late charge on the outstanding balance once the account is past due.  Late charges are posted prior to late notice mailing and then again just prior to billing the next quarterly water and sewer charges.  If you have any questions call Terry at 406-995-2660, or email him at

The Rate Study Process

As a District, we have a number of challenges facing us, including wastewater plant upgrades that have both capacity and environmental benefits, acquiring reliable sources of potable water for our existing and future users, and promoting conservation that will both support maintaining an adequate water supply and managing future capital expansion needs. Most of all, we have an obligation to responsibly take care of the District as a whole and this includes making sure that we have the financial resources to accomplish the variety of tasks put in front of us. To help the District, AE2S Nexus, a division of AE2S, was brought in to assist staff in developing the financial plan for our water and sewer system. AE2S Nexus brings years of experience working with water and sewer utilities like ours to help implement industry best practices in financial planning. The work completed by AE2S Nexus includes detailed Cost of Service, Rate Design, and Revenue Adequacy analyses that formed the basis for a five-year financial plan.  The plan is based on projected annual operating expenditures and capital expenditures that are necessary to continue to provide high quality water of sufficient quantity into future.  The plan contains rate recommendations for 2020 as well as a forecast of future rate adjustments, which will be reviewed annually and modified based on actual revenue generated and updated revenue requirements.

What is a Rate Study and why did we need one? The video below provides a high level description of a Cost of Service Analysis (COSA). []  The results of the COSA identified whether the existing method of charging for water use collecting revenue from users at a level commensurate with the cost of providing water service. In Big Sky, we have a unique combination of condominiums, regular residences, and a smaller amount of commercial for which water use is directly related to peak tourism seasons.

Read more…