What and how we bill

The City's sanitary sewers and storm drainage facilities are two completely independent systems. Denver's storm drainage facilities keep storm water safe, removing as many pollutants as possible from the water and creating a safe flow for storm water during storms or snow melts. These facilities are massive in scope and must be engineered, operated and maintained.

Storm drainage charges are for the collection and disposal of rain water and snow melt. The annual charge to a property owner is based on the relative impact the property will have on the storm drainage system. For instance, a parking lot will have more storm runoff than a grassy area of the same size. The charge is based on the ratio of impervious surface area to total parcel area. Based upon that ratio, a rate is applied to the impervious area to calculate the annual charge. The higher the ratio, the greater the rate. Denver's sanitary sewer lines collect discharge from sanitary conveniences of dwellings, business buildings, public and private institutions, and industrial establishments, and charges are for the collection, treatment, and disposal of water going down your sinks, drains, and toilets.

  • Your storm drainage bill is a separate bill which is sent to every owner of improved property within Denver once a year
  • Your sanitary sewer bill is prepared monthly and combined with your water bill.

Billing Questions

To reduce costs and as a convenience to customers, a combination bill was developed. The sanitary sewer bill is based on the water consumption metered by the Denver Water Department. This information is included on your combined bill.
Each year, we establish a new winter consumption for every residential customer, based on the metered water consumption shown on the February bill. The winter consumption sets the sanitary sewer charges for the entire year, starting with the March bill. Even though your water use may increase during the summer, your sanitary sewer charges will remain constant until a new winter consumption is calculated.

The sanitary sewer charge for commercial property is based upon actual metered consumption in each billing period during the year.
Your sanitary sewer charges are actually lower than many other cities, both locally and nationally. A national 2009 survey shows that Denver's residential sanitary sewer rates are the 3rd lowest of 36 large U.S. cities surveyed.
You may phone Wastewater's Customer Service unit at 303-446-3500. Our telephone hours are 7:30 a.m. to 4:00 p.m., Monday - Friday. Our offices are open to answer your questions from 7:30 a.m. to 4:30 p.m., Monday - Friday. We are located at 2000 West Third Avenue, Denver
You should pay any past due amounts as soon as you can. Wastewater Management Division does not charge a late fee. If you fail to pay sanitary sewer or storm drainage charges a service lien can be filed against your property. When a service lien is filed the balance owed is increased by a filing fee and monthly delinquency interest is charged. Service lien delinquencies unpaid as of November of each year are sold at a tax lien sale. The City Treasurer will then file a tax lien against the property. If the tax lien and interest is not settled within three years from the date the tax lien is filed, title to the property may be lost to a Treasurer's Deed.