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Water and Wastewater Rates

On January 1, 2014, Wholesale Water Rates increased 18% from $2.69 per 100 cubic feet (ccf) to $3.17/ccf. (1 ccf is equal to 748 gallons). The increase in the Wholesale Water Rate is a direct pass-through of the water rate charged by the DuPage Water Commission, the City of Naperville’s water supplier. Wholesale Water Rates are approximately 70% of customers’ monthly water utility bills.

Naperville’s Retail Water Rate, Monthly Customer Charges and Wastewater Rate remain unchanged for 2014. On January 1, 2015, rates are scheduled to increase again. The Wholesale Water Rate will increase 17% to $3.70/ccf; Retail Water Rates and Monthly Water Customer Charges will increase 6% and Wastewater and Monthly Wastewater Customer Charges will increase 3%. All of the noted increases were planned increases as programmed by the DuPage Water Commission and the City of Naperville’s Five-Year Cost of Service Rate Study completed and approved the by the Naperville City Council in 2010.

The below chart depicts last year’s rates, current and planned future rate increases and the effects the changes have on an average monthly utility bill.

Water Rates
  Jan. 1, 2013 Jan. 1, 2014 Jan. 1, 2015
Wholesale water rate (DWC)
per 100 cubic feet
$2.69 $3.17 $3.70
Retail rate (City of Naperville)
per 100 cubic feet
$1.39 $1.39 $1.47
Total volumetric rate $4.08 $4.56 $5.17
Monthly customer charge $5.05 $5.05 $5.35
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$48.67 $53.80 $60.62
Change in monthly bill from previous year $5.96 $5.13 $6.82
% Change in bill from prior year 13.94% 10.54% 12.68%
Wastewater Rates
  Jan. 1, 2013 Jan. 1, 2014 Jan. 1, 2015
Rate per 100 cubic feet $1.85 $1.85 $1.91
Monthly customer charge $8.49 $8.49 $8.74
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$28.27 $28.27 $29.16
Change in monthly bill from previous year $0.78 $0.00 $0.89
% Change in bill from prior year 2.85% 0.00% 3.15%
Combined Water and Wastewater Monthly Residential Utility Bill for 8,000 gallons (1,069 cubic feet)
  Jan. 1, 2013 Jan. 1, 2014 Jan. 1, 2015
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$76.93 $82.06 $89.78
Change in monthly bill from previous year $6.74 $5.13 $7.71
% Change in bill from prior year 9.60% 6.67% 9.40%

The Water and Wastewater Utilities and all City Departments are committed to providing Naperville’s residents and businesses with the highest quality services at the lowest possible cost. These increases are necessary to maintain the high quality and most reliable Water and Wastewater Utility services to the community.