EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records
PUBLIC WATER SYSTEM RECORDPWSID IL0434670

Illinois · Surface water purchased

Naperville

EPA’s September 2026 export lists Naperville (PWSID IL0434670) as No current violation flagged, serving a reported 156,406 people from a surface water purchased source, with 0 rules in current violation.

Source: EPA SDWIS system-search export · Snapshot 13 Sep 2026 · Federal compliance fields

CURRENT EXPORTNo current violation flaggedNo current violation is flagged in this EPA export. This is not a household water test.
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01 / CURRENT FLAGS

EPA compliance flags for Naperville

Naperville is listed as no current violation flagged in the current export; the five federal flag categories remain separate below.

  • NOT FLAGGED
    Health-based violationCurrent HEALTH_FLAG in the EPA export.
  • NOT FLAGGED
    Monitoring and reportingCurrent MR_FLAG in the EPA export.
  • NOT FLAGGED
    Public notificationCurrent PN_FLAG in the EPA export.
  • NOT FLAGGED
    Other violationCurrent OTHER_FLAG in the EPA export.
  • NOT FLAGGED
    Serious violatorCurrent serious-violator status in the EPA export.
Important limit

This page is not a household water test. A clear federal flag does not prove every home has safe water, and a flag is not a measurement at your faucet. Plumbing, service lines, local sampling, private wells, and newer events may not be reflected here.

02 / VIOLATION RECORD

Quarters with violations11rolling history field
Quarters with SNC0significant noncompliance
Rules in current violation0EPA export count
Rules in 3-year window2EPA export count

Current rule entries for Naperville

EPA supplied 1 current contaminant, rule, or violation-category entries for Naperville in the exported fields used here.

  • Monitoring and Reporting

Three-year entries for Naperville

EPA supplied 16 contaminant or rule entries for Naperville in the three-year history field.

  • 2005=Endrin
  • 2010=BHC-GAMMA
  • 2015=Methoxychlor
  • 2020=Toxaphene
  • 2035=Di(2-ethylhexyl) adipate
  • 2037=Simazine
  • 2039=Di(2-ethylhexyl) phthalate
  • 2042=Hexachlorocyclopentadiene
  • 2050=Atrazine
  • 2051=LASSO
  • 2065=Heptachlor
  • 2067=Heptachlor epoxide
  • 2274=HEXACHLOROBENZENE
  • 2306=Benzo(a)pyrene
  • 2456=Total Haloacetic Acids (HAA5)
  • 2959=Chlordane

03 / OVERSIGHT & COVERAGE

Visits and sanitary surveys for Naperville

The export lists 2 site visits in five years and 1 significant deficiencies for Naperville.

Site visits, past 5 years
2
Inspection visits
0
Other visits
2
Last sanitary survey
09/22/2025
Last recorded visit
09/22/2025
Significant deficiencies
1

Places served by Naperville

EPA associates Naperville with the listed cities, counties, ZIP codes, and Illinois service area identifiers.

State / territory
Illinois
Counties
DuPage
ZIP codes
Not supplied
Federal PWSID
IL0434670
Registry ID
110013042938

04 / HOW TO USE THIS RECORD

Current public records for Naperville

EPA’s facility report, the Illinois drinking-water program, and Naperville’s Consumer Confidence Report are the current public records beyond this September 2026 snapshot.

Confirm current conditions with the utility's latest Consumer Confidence Report, your state drinking-water program, and the EPA facility report. For household concerns, ask a qualified local laboratory about tap testing.

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