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.