Drinking water quality · 2024
· Verified
What's in Naperville, IL tap water
15 contaminants were measured in the Naperville, IL water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 15
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- IL
Where your water comes from · EPA SDWIS
Naperville, IL's drinking water comes from ground water, drawn from 8 sources.
Source
- WELL 16 (21120) EMERGENCY
- WELL 19 (21123) EMERGENCY
- WELL 20 (21124) EMERGENCY
- WELL 21 (21125) EMERGENCY
- + 4 more
Treatment
- TP 30-STRUCTURE 15D
- TP 40-NORTHWEST WATER WORKS
- TP 41-STRUCTURE 15H
- + 20 more
Distribution
Also buys water from DU PAGE WATER COMMISSION.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 16.8–63.2 ug/LRangeSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 11.8–34.6 ug/LRangeSystem-wide | None set | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1–1.2 mg/LRangeSystem-wide | 4 mg/LMRDLG | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.29 NTUReported levelSystem-wide | None set | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.0042 mg/L90th percentileAt the tap | 0.015 mg/LAction level | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.16 mg/L90th percentileAt the tap | 1.3 mg/LMCLG | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0.54 ug/LReported levelSystem-wide | 0 ug/LMCLG | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.0191 mg/LReported levelSystem-wide | 2 mg/LMCLG | Within the limit |
| SodiumA naturally occurring salt component. | 9.1 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.1 pCi/LReported levelSystem-wide | 0 pCi/LMCLG | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.95 pCi/LReported levelSystem-wide | 0 pCi/LMCLG | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.75 mg/LReported levelSystem-wide | 4 mg/LMCLG | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.36 mg/LReported levelSystem-wide | 10 mg/LMCLG | Within the limit |
| SulfateA naturally occurring mineral from rock and soil. | 27.2 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Nitrate Nitrite | 0.36 mg/LReported levelSystem-wide | 10 mg/LMCLG | Within the limit |
People also ask about Naperville, IL's water
+Is Naperville, IL tap water safe to drink in 2024?
Every one of the 15 contaminants measured in Naperville, IL's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Naperville, IL tap water?
15 contaminants were measured in Naperville, IL's 2024 Consumer Confidence Report, spanning metals, inorganic chemicals, and disinfection byproducts. 10 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Naperville, IL's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Naperville, IL's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.