Water and Wastewater Rates

Components of Your Water and Wastewater Bill

Fixed User Charges

As of Jan. 1, 2021, the following fixed water/wastewater user charges are in effect for Naperville Water Utility customers:

Phosphorus Surcharge

A graduated phosphorus surcharge was introduced in 2017 for wastewater customers. These phosphorus surcharge funds will be utilized to fund 50% of the Illinois Environmental Protection Agency-mandated Springbrook Water Reclamation Center improvements to reduce the amount of phosphorus discharged from the facility. Work on the improvements is anticipated to begin around 2025. The phosphorus surcharge will expire once funds collected are equal to 50% of the cost of improvements.

Meter size

2021 Monthly Surcharge

5/8-inch by 3/4-inch  $1.80
1-inch $3.00
1 1/2-inch $6.00
2-inch $9.60
3-inch $19.20
4-inch $30.00
6-inch $60.00
8-inch $96.00
10-inch $252.00
12-inch $318.00

* The monthly surcharge is subject to change for 2022 and beyond, pending the results of a rate study scheduled to be conducted in 2021. See the 2021 Water Rate Study section below for details. 

DuPage Water Commission/City of Chicago Costs

The wholesale water rate on customer bills 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 DWC based on the City of Chicago’s water rates.

The DWC sets its wholesale water rate each year in April, to go into effect May 1. The current rate is $3.72 per 100 cubic feet. The Naperville Water Utility anticipates that the DWC will hold the rate flat for 2021, but it is subject to change. 

Unincorporated Customer Surcharge

Unincorporated Naperville water customers pay a 10% surcharge on water rates. These customers' bills will have wholesale, retail and monthly customer service charge rates 10% higher than the rates in the above PDFs, which apply to incorporated Naperville customers.

2021 Water Rate Study 

Planning for the Future

The Naperville Water Utility periodically conducts rate studies to help plan for its financial needs. The most recent study, conducted in 2017, provided guidance on customer rates through 2021. This year, the Water Utility plans to conduct a new rate study to consider several cost factors that will affect rates in the future, including day-to-day operations; critical infrastructure improvements needed to ensure continued reliability; and required phosphorus removal improvements to the Springbrook Water Reclamation Center.

A new rate structure to be determined through the upcoming study will help meet these needs and keep the Water Utility on sound financial footing. 

2021-2022 Rates

The average residential water/wastewater customer uses 750 cubic feet of water per month. A customer with this usage will see the following average monthly utility bill in 2021, under the approved rate structure. 

Year Average monthly bill 
2021 $82.81