Water and Wastewater Rates

Current Water and Wastewater Fixed User Charges

As of May 1, 2017, the following fixed water/wastewater user charges are in effect for Naperville Water Utility customers:

These fixed charges were a result of the recent Water Utility Rate Study, described in detail below. The rate study was conducted to ensure the utility’s future financial needs are met through 2021 and beyond; rate increases for 2018-2021 will be implemented January 1 each year.

Note that a graduated phosphorus surcharge is now in effect for wastewater customers. These phosphorus surcharge funds will be utilized to fund 50% of the Environmental Protection Agency-mandated Springbrook Water Reclamation Center improvements to reduce the amount of phosphorus discharged from the facility. Work on the improvements is slated to begin in 2025. The phosphorus surcharge will expire once funds collected are equal to 50% of the cost of improvements.

The Wholesale Water Rate is a direct-pass through of the water rate charged by the DuPage Water Commission (DWC), the City of Naperville’s water supplier. The Wholesale Water Rate component is determined by the DuPage Water Commission based on the City of Chicago’s water rates. In 2017, the DWC wholesale water rate increased from $3.63 to $3.65.

Please note that all unincorporated Naperville water customers pay a 10% surcharge on water rates. These customers' bills will reflect wholesale, retail and monthly customer service charge rates 10% higher than the rates noted in the above PDFs, which apply to incorporated Naperville customers.

2016 Water Rate Study

Planning for the Future

Naperville’s Water Utility provides its customers with high-quality water and wastewater services that enhance our quality of life and make Naperville an attractive location for businesses. In fact, our 2016 recent Citizen Survey showed 95% of people are satisfied with the reliability of their water service.

Part of the utility’s commitment to serving the community well includes careful planning for the future. To help meet the utility’s needs through 2021, a rate study was conducted in 2016. Future considerations included:

  • Day-to-day operations – Rates today are not covering the utility’s cost of providing service to customers.

  • Improvements – Critical water main infrastructure improvements under major roadways and railroad crossings are needed in the near future to ensure continued reliability, avoid disruptions and make sure customers are receiving an excellent value for what they pay.

  • Federal regulations – As part of the new permit to operate the Springbrook Water Reclamation Center, the City must remove more phosphorus than it currently does from the water it treats. (Phosphorus is a mineral that is found in the human body and excreted in liquid waste, hence its presence at the water treatment center.) This will have positive environmental impacts for local and national waterways, as excess phosphorus in water can cause “dead zones” where no aquatic life can survive. These phosphorus improvements must begin in 2025.

Proposed Rate Changes

After careful consideration, a decision was made on rates that accomplish several actions, including providing revenues to continue existing services, eliminating customer classes subsidizing each other’s service, increasing capital funding to address upcoming projects and implementing a transparent, gradual surcharge on customers’ bills to solely fund the needed phosphorus improvements. In addition to the surcharge, phosphorus improvements will also be funded by the Electric Utility repaying a loan made to it by the Water Utility in 2014 and debt service. The surcharge would expire once funds collected equal half of the improvement costs.

Below is a chart outlining the selected rate structure and its impacts on different customer classes. These figures reflect what an average water/wastewater use monthly bill for customers in these classes looks like.

YearResidentialSmall CommercialLarge Commercial
2016 $65.07 $415 $2,499
2017 $67.59 $432 $2,585
2018 $70.18 $452 $2,681
2019 $73.14 $477 $2,796
2020 $75.36 $503 $2,928
2021 $77.63 $534 $3,089

To accomplish these actions, and accounting for an additional pass-through rate increase from the DuPage Water Commission, the average residential water customer would see their bill increase by $2.65 beginning in May 2017.

Remaining Competitive

Naperville already enjoys some of the lowest rates among other communities that source water from Lake Michigan, as seen below in this 2016 residential comparisons chart.

Residential comparisons of water and wastewater rates in Naperville and surrounding communities

(Click here to see a larger version of the above residential comparisons chart)

Rates will remain competitive following the aforementioned rate changes. In addition, the utility will be poised for long-term financial stability and will continue to provide the reliable service that is a hallmark of Naperville.

Department of Public Utilities-Water