City of Naperville Water and Wastewater Utility
Naperville, Illinois and unincorporated Naperville service areas
Population reference
156,406 people (EPA SDWIS active CWS PWS IL0434670)
Billing detail
Partial public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Monthly utility bills. The City’s eBill launch materials state that paperless customers receive a monthly email notification and PDF statement.
- Rate structure
- Fixed customer and capital charges plus volumetric water and wastewater charges. Wholesale DuPage Water Commission/City of Chicago costs pass through to customers; unincorporated customers pay a 30% surcharge on the listed water and monthly customer-service rates. The 2026 adopted schedule supports ongoing water-main and Springbrook treatment-plant improvements.
- Residential cost reference
- Naperville defines its 2026 average residential combined water/wastewater bill as $118 per month for a customer using 750 cubic feet monthly, approximately 5,610 gallons. A 5,000-7,000 gallon household is therefore near the City’s published average benchmark, with the final amount varying by usage, fixed capital/phosphorus charges, wholesale pass-through, and incorporated versus unincorporated status.
- Wastewater and sewer calculation
- Naperville combines fixed user charges with volumetric wastewater charges based on water use. The bill can also include a phosphorus charge for Springbrook improvements and a water capital charge. The reviewed official page does not describe a winter-average formula.
- Meter reading
- Naperville’s Empower dashboard provides residential and commercial water-usage history, and the City states that non-wireless meter-alternative customers can use the dashboard with a one-month data delay because those meters receive monthly manual reads. The reviewed pages do not state the full AMI deployment percentage or universal transmission interval.
Context, not a score
How documentation coverage compares
This profile
71%
overview fields with research notes
Illinois
30%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Partial public detail found
5 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
71%
Details not confirmed in the reviewed public material
- New-account deposit
- Activation or transfer fee
“Not confirmed” means the directory did not identify a dependable public statement. It does not mean the provider has no policy or option.
Primary verification routes
- City of Naperville Water and Wastewater Utility public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA SDWIS / ECHO lookup (IL0434670) ↗
Search the federal drinking-water database using public water system ID IL0434670.