Incoming revenues define the viability and sustainability of any functioning organization. Water sales revenue will need to be designed to allow a utility or water company to operate its system, maintain compliance with relevant federal and state laws, conduct routine maintenance, pay off debt, and establish and maintain a reserve for future capital improvements. In addition, water rates and billing practices (see billing practices link) can be used to message customers regarding water waste and wise water use, since water rates and fees influence the community perception of the value of water. Low rates may promote water waste. Rates that are too high may create blight if outdoor irrigation ceases in some locations. Changing rates upward may also impact water customers that live on fixed budgets. Therefore, setting (and as importantly, changing) water rates has a social justice component that will always influence the process and in the end affect decision making at the Board level. Therefore water rates can impact utility revenue and customer demand.
Water rates and fees include the following, which are listed by common names but the actual name used by any specific utility may vary:
Service fee (base fee) – this is a fee that is charged each customer regardless of water use. It typically is used to cover administrative costs and other fees incurred by the utility, and it often includes an allowance for a minimum volume of water use (for example, a $24 base fee includes 3,000 gallons of water use prior to water rate costs being incurred by the customer).
Water rates – cost per volume of water used, typically on a price per unit volume (typically per thousand gallons, but some use per one hundred cubic feet, or other variations). Types of water rates commonly used include:
Uniform rate - a constant rate per unit of water is charged which does not change with the amount of consumption.
Descending (or declining) Block Rates – water rate per unit of water used decreases as more water is used. Historically this rate structure was used in various locations, most often to support large commercial customer needs; however given the status of water scarcity and increasing costs to produce, treat and distribute water in Colorado, descending block rates are considered inappropriate.
Ascending (or inclining) Block Rates – water rate per unit of water used increases as more water is used. These types of rates can encourage customer water use efficiency, if the block rates are substantially punitive (i.e., increase significantly) as water use increases.
Water budget - a variation of inclining block rates where the block size (i.e., the amount of water sold at a particular unit rate) is defined by an empirical determination of efficient use for each customer such as irrigable area. Water budgets are considered to be more equitable than inclining block rates especially in circumstances with different customer characteristics within a specific sector (e.g., having a group of residential customers with substantially different lot sizes; customer having different numbers of family members using a single household, etc.).
Seasonal or variable rates - higher unit prices are charged during periods of water scarcity (typically during the summer and fall, or in response to a drought, to reduce demand in times of water shortage and to encourage customer water demand reductions). Seasonal rates can be used to adjust either uniform rates or inclining block rate structures.
Tap or impact fees – these fees typically relate to the cost for a new tap to be installed at a home or business, and may include the cost of new water development and/or infrastructure associated with the connection.
Connection fees – these are typically the fees that occur when a new customer connects to an existing tap. New customer connection fees typically include administrative costs to begin and end billing and meter reading for a new customer.
Other Relevant Influences
The items described below influence how water rates are set and should be considered during water rate planning efforts.
Customer segments – many utilities develop different water rate structures and pricing for different types of customers, differentiating water use costs for single family residential from multi-family residential from commercial from irrigation or seasonal customers.
Water development costs – Some organizations with substantial growth will include water development fees in either tap and impact fees, or as service fees, or both.
Costs of service – The rule is simple: Charge rates that cover service costs; however, building a rates program that follows that rule is not so simple. Some utilities approach the task by identifying some specific customer classes and then determining the cost of providing service for each class. Based on that determination, rates are adjusted. A huge impact on the cost of service is peak usage. "Peak usage" means the largest amount of water the system is asked to provide all at once. The system cannot be built to provide average use; it must be capable of satisfying peak need. Costs to operate during peak use are therefore different, and higher, than operating during average use (for example, electricity costs increase during peak use).
- Cost of infrastructure improvements and repairs – All water utilities are faced with the cost of maintaining and replacing aging infrastructure. Different utilities are faced with infrastructure that consists of materials and equipment differing by age and quality. Therefore, each utility must develop a reserve from water sales revenues that allow for timing reparations and replacement (see Facility Assessment and Capital Improvement Planning BMP).
Setting water rates and fees should be considered as an ongoing effort continually being updated and improved, since costs and customer demands change constantly. The process of changing water rates and fees is provided in the figure.
Setting water rates and fees involves data collection to identify costs and revenue sources; estimating future revenue needs (which includes the critical task of developing capital improvement budgets (see the Facility Assessment and Capital Improvement Planning BMP); and designing rates and other charges based on expected demand and customer needs.
Specific actions that are considered best management practices include the following, when setting rates:
- Water rates should cover all costs of service related to water delivery, as well as expected cost to maintain and upgrade the water infrastructure. For this reason, it is not typically appropriate to include “free water” as part of a base service fee, since the cost of water delivery is not necessarily included in the base service fee.
- The base service fee should include expected fixed costs (e.g., future capital improvement projects, current debt service, staffing costs, etc.), whereas water rates should cover all variable costs related to water delivery (e.g., energy costs, treatment costs, etc.).
- Water utilities should evaluate the benefits of developing inclining block rates or other conservation oriented rate structures when assessing water rate programs, to help create incentives for customer water use efficiency; however, inclining block rates will need to include substantial increases in charges to create punitive impacts (e.g., an inclining block rate with less than a 25% change between blocks does not create a cost signal that is impactful enough for most situations; with the top tier set at 200% of the base rate).
- Seasonal water rates should be considered for those water utilities that have challenges meeting peak day demands related to seasonal customer water use (e.g., summertime irrigation and/or cooling demands). Seasonal rates can be used to increase summertime water costs, sending a message to customers related to the cost of water and incentivizing customers to use water more efficiently.
Resources
US EPA Small System Water Rate Setting
American Water Works Resources on Utility Rates
Department of Local Affairs Technical Resources on Utility Rates
Colorado Water Wise Best Practices Guidebook
Georgia Environmental Protection Division – Conservation Water Rate Structures
Overall trends of water supply costs