Water Billing Rates and Administrative Fees

Water structure

Castle Rock has been using a tiered water rate structure for more than 20 years. In a tiered structure, the more water you use the more you would pay. Fees are progressively charged at a higher rate. Nationally, tiered structures have proven successful in encouraging conservation.

Water rates

Water budgets

The indoor water budget is based on your individual household's water consumption for the winter. The outdoor water budget is calculated based on the irrigated area and evapotranspiration (ET). Your water budget is individualized for your household consumption. Whether you have all grass, or a xeric landscape, you only pay for the amount of water you actually use. It's all part of Castle Rock's proactive measures to ensure there is water for our future. 

If you have any questions concerning the water budget rate structure, email us.

Water usage charges

Tier 1 (0 gals. to AWMC): AWMC is the amount of water available at the Tier 1 rate (see above).
Tier 2 (irrigation season rate): The amount of water available for seasonal purposes from April through October. This is calculated by using each customer's irrigated and the monthly plant material water needs (evapotranspiration - ET).
Tier 3 (excessive use rate): The amount of water over your total water budget allocation.
Tier 4 (conservation surcharge): The water conservation measure adopted by Town Council assesses an additional charge to each 1,000 gallons used over 40,000 gallons by single-family residential customers.

Average winter monthly consumption

The average winter monthly consumption (AWMC) is used to establish the water budget. It is calculated for each customer by dividing the total water used in the months of November, December, January and February by four. This represents the amount of water for indoor use (Tier 1) and the amount of wastewater treated each month. The AWMC is reset annually on your April statement. For new customers, until an individualized AWMC is established, an average for the customer class is assigned for water and a $36 per single family equivalent (SFE) is charged for wastewater. Example: For single-family residential customers, the average AWMC is 5,000 gallons (water available at Tier 1) and the monthly wastewater charge is $36.

Fixed charges

Fixed charges are organized separately from your water usage. These remain stable throughout the year and include services like providing water services, renewable water, stormwater and wastewater. 
  • Water charge: The cost for providing the water service for distribution and treatment to each customer.
  • Renewable water resource charge: This charge has been part of Castle Rock residents' water bills since 2006. It goes toward securing renewable water for the Town's future, including acquisition and development of sustainable water resources.
  • Stormwater charge: Water from rainfall, snowfall and other urban runoff musts be managed to prevent flooding and water quality issues.
  • Wastewater (AWMC) charge: These fees cover the proper conveyance and treatment of the used water flowing out of your home (down the drains and when a toilet is flushed).

System development fees

Developers not only pay for the infrastructure of the water system in their residential or commercial development, but also for future water supply. View the current system development fees for more information.

How our rates compare

When we conduct our annual financial analysis for rates and fees, our proposed water rates are compared with other South Metro Water Supply Authority (SMWSA) * water providers for a typical winter usage of 5,000 gallons and a typical summer usage of 15,000 gallons per month. Castle Rock Water's rates are mid-range compared to other water providers in the region. SMWSA members are each faced with similar water, growth and infrastructure challenges, and together we are on our way to achieve a sustainable, balanced supply.

While we did compare the proposed rates and fees with other providers in Colorado, these may not be apples to apples comparisons. It is important to note, a number of the South Metro water providers have rates affected by tax mill levies. Where this information was available, Castle Rock Water has included the tax mill levy based on median home price distributed equally over 12 months. Castle Rock Water does not get any funding from a tax mill levy. The rate comparisons are shown below. 
rate comparisons winter
rate comparison summer
* SMWSA members: Arapahoe County Water and Wastewater Authority, Castle Pines Metropolitan District, Castle Pines North Metropolitan District, Centennial Water Water & Sanitation District, Cottonwood Water and Sanitation District, East Cherry Creek Valley Water and Sanitation District, Inverness Water & Sanitation District, Meridian Metropolitan District, Parker Water & Sanitation District, Pinery Water & Sanitation District, Roxborugh Water and Sanitation District, Stonegate Village Metropolitan District and the Town of Castle Rock.