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Read by an AI agent (a large language model) from the utility's official rate schedule, then audited by a second model against the same schedule. This bill is for the main service area; customers in 1 other rate area (Outside City Limits) pay different rates.
Fixed monthly customer charge, 5/8"x3/4" meter: $11.69 Water use, 8.021 HCF at $7.46 ($3.06 city delivery + $4.40 DuPage wholesale): $59.84 Fixed monthly water capital charge: $1.38 Total: $72.91/mo
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Utility profile · IL
NAPERVILLE supplies water to about 160,000 people in Naperville, Lisle, and 2 other places in Illinois. A typical household using 6,000 gallons a month pays an estimated $72.91 in the main service area, 25% above the national average.
Rates effective 2026-05-01
Updated Oct 2026
This bill is for the main service area; customers in 1 other rate area (Outside City Limits) pay different rates.
| Fixed monthly customer charge 5/8"x3/4" meter |
$11.69 |
| Water use 8.021 HCF × $7.46 ($3.06 city delivery + $4.40 DuPage wholesale) |
$59.84 |
| Fixed monthly water capital charge | $1.38 |
| Total | $72.91 |
Monthly cost (6k gal) vs up to 10 nearest utilities with published rates. Click to navigate.
Population served and the municipalities covered by this utility's service area.
Boundaries from the EPA Water System Service Areas dataset. Not all utilities have mapped boundaries.
Municipalities served
Supply and provider classification from EPA records.
Named intake/well source and interconnections (who this utility buys from or sells to) aren't captured yet — tracked separately for a future update.
Annual bill as a share of median household income in the service area.
We don't yet systematically track whether a utility offers income-based or sliding-scale pricing separate from its standard rates — tracked separately for a future update.
This rate was extracted from NAPERVILLE's published tariff document by an AI research agent, then checked against a validation checklist before publishing. See the full methodology for how every utility on this site is sourced and scored.
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