Public Water Partners

NAPERVILLE, IL · DuPage County

NAPERVILLE Water System

Consumer Confidence Report status

NAPERVILLE must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for NAPERVILLE.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

System facts

System ID (PWSID)
IL0434670
System type
Community Water System
Population served
156,406
Service connections
45,580
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

NAPERVILLE is the fourth largest community water system in Illinois, serving 156,406 people from surface water.

As of August 1, 2026, its federal record holds 16 entries in 2023, all of which EPA lists as closed. Nothing has been added since 2023.

All 16 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals and the Stage 2 Disinfectants and Disinfection Byproducts Rule.

Violation history

  • Monitoring and Reporting (DBP)

    —

    Total Haloacetic Acids (HAA5)

    April 1, 2023 – June 30, 2023

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2023 – December 31, 2025

    Resolved

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2023 – December 31, 2025

    Resolved

  • Monitoring, Regular

    —

    LASSO

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2023 – December 31, 2025

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2023 – December 31, 2025

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2023 – December 31, 2025

    Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is NAPERVILLE required to publish a Consumer Confidence Report?

Yes. NAPERVILLE is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is NAPERVILLE’s next Consumer Confidence Report due?

NAPERVILLE’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does NAPERVILLE have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for NAPERVILLE.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

SLEVNIK, JOSEPH

630-420-6125

NAPERVILLE, IL 60564