Effective May 1, 2023, the City has added a fee to help pay for the City’s share of the cost to upgrade the Naperville Wastewater Treatment Plant. The fee will first appear on June and July's water/sewer bills.
- Per 1,000 gallons: Water – $2.26 and Sewer – $5.23
- Per bi-monthly billing: Water – $14.72 and Sewer – $40.36
- Commercial rates will vary by meter size
- NEW FEE: Naperville Wastewater Treatment Capital Improvement volume charge – $3.08 per 1,000 gallons of metered water
Why is there an additional fee on
the City’s water/sewer bills? All of the City's wastewater, by a long-standing agreement with the City of Naperville, goes to the Naperville system for required treatment.
Naperville's wastewater treatment plant needs major upgrades. Someof the equipment is 50 years old, and the plant must also be brought up to
Illinois Environmental Protection Agency (IEPA) standards.
The City will contribute 9% of the total cost of this project.This is based on the fact that Warrenville produces approximately 9% of the
flow that goes into Naperville's system.
Total cost estimates are $170 million for the project, withWarrenville's share approximately $22 million, including estimated financing
and interest. The City will structure this payment over several years.
For more details, read the Water TreatmentPlant FAQ:
• Why does Naperville need to upgrade its facility?
There are multiple reasons. Some upgrades include replacing equipment that is 50 years old. Other upgrades address Illinois Environmental Protection Agency (IEPA) requirements to reduce the amount of phosphorous in the effluent released from the treatment plant.
The project will also expand the plant’s capacity for biological treatment of the solids in the water.
• Why doesn’t Warrenville build its own treatment plant now?
are several reasons, including it is more cost-effective to pay Naperville totreat Warrenville’s flows and occasionally pay Naperville for Warrenville’s
proportional share of any maintenance and replacement or upgrade costs to thetreatment plant.
Warrenville’s flows enter Naperville’s system at two locations. It is unlikelythat Warrenville could find a location in the community that could treat all of
Warrenville’s flows without some major work to reroute the flows from one orboth of those parts of the system to wherever the plant would be constructed.
Without knowing where the plant would be, it is impossible to estimate thescope or cost of the improvements necessary to reroute the flows. The costs
would be in the millions of dollars.
o Constructing a new plant to treat Warrenville’s wastewater to today’s standards is estimated to cost $65 million.
oWarrenville would also need to staff the plant, which means an estimated
additional 3-4 fulltime staff, at an estimated cost of $325,000 to $415,000 ofsalaries and benefits per year forever.
• Could Warrenville send its flows to another neighboring community (Aurora, West Chicago, Wheaton)?
Those plants are not sized to accommodate Warrenville’s flows. Even if it waspossible, those plants would need to be expanded, if they even could be, and
Warrenville would have to pay for those expansion costs, which would likely besignificantly more expensive than paying Naperville.
Warrenville’s sanitary sewer system flows primarily by gravity, and drainstoward Naperville, at the south City limits. Even if it were possible to
replace the miles of sanitary sewer necessary to make it flow a differentdirection, those costs plus the
necessary new or upgraded pipes to convey the flows through the othermunicipality to their treatment plan would be cost-prohibitive. Especially when
added to the already cost-prohibitive treatment plant upgrades.