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Water and Wastewater Rates

On May 1, 2015, Wholesale Water Rates decreased from $3.70 per 100 cubic feet (ccf) to $3.63. (1 ccf is equal to 748 gallons). The decrease 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.

The Wholesale Water Rate component is determined by the DuPage Water Commission based on the City of Chicago’s water rates. Accordingly, the wholesale water rate is automatically passed directly through to City of Naperville utility customers.

The below chart depicts last year’s rates, current rates and the effects the changes have on an average monthly utility bill. Please note that all unincorporated Naperville water customers pay a 10% surcharge on the water rates. These customers' bills will reflect volumetric (wholesale and retail) rates 10% higher than the rates published below, which apply to incorporated Naperville customers.  

The wholesale rate is a pass through rate to the consumer. However, the wholesale rate does require City Council action to amend and/or adopt new rates as we receive information from the DuPage Water Commission.

 
Water Rates
  Jan. 1, 2014 Jan. 1, 2015 May 1, 2015
Wholesale water rate (DWC)
per 100 cubic feet
$3.17 $3.70 $3.63
Retail rate (City of Naperville)
per 100 cubic feet
$1.39 $1.39 $1.39
Total volumetric rate $4.56 $5.09 $5.02
Monthly customer charge $5.05 $5.05 $5.05
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$53.80 $59.46 $58.69
Change in monthly bill from previous year $5.13 $5.67 -$0.77
% Change in bill from prior year 10.54% 10.53% -1.29%

Wastewater Rates
  Jan. 1, 2014 Jan. 1, 2015 May 1, 2015
Rate per 100 cubic feet $1.85 $1.85 $1.85
Monthly customer charge $8.49 $8.49 $8.49
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$28.27 $28.27 $28.27
Change in monthly bill from previous year $0.00 $0.00 $0.00
% Change in bill from prior year 0.00% 0.00% 0.00%

Combined Water and Wastewater Monthly Residential Utility Bill for 8,000 gallons (1,069 cubic feet)
  Jan. 1, 2014 Jan. 1, 2015 May 1, 2015
Average monthly residential
water bill for 8,000 gallons used
(1,069 cubic feet)
$82.06 $87.73 $86.96
Change in monthly bill from previous year $5.13 $5.67 -$0.77
% Change in bill from prior year 6.67% 6.90% -0.88%