Naperville, IL Water Quality Report

Is Naperville tap water safe? See PFAS and lead contamination levels for Naperville, Illinois. Compare to EPA limits and get filter recommendations.

Quick Answers

Is Naperville tap water safe to drink? Naperville tap water meets most federal EPA limits, but PFAS compounds have been detected at an average of 3.6 ppt across 5 compounds. A certified pitcher filter or reverse osmosis system is recommended for sensitive populations.

What contaminants are in Naperville water? Top PFAS compounds detected in Naperville water: lithium (18.6 ppt), PFPeA (0.01 ppt), PFBA (0.01 ppt). See the full table for all monitored contaminants and comparison to EPA limits.

What filter should I use in Naperville? Reverse osmosis removes 90%+ of PFAS, lead, and arsenic. NSF-53 certified pitcher and faucet filters (ZeroWater, Clearly Filtered, LifeStraw) work for smaller households. Skip standard Brita filters for PFAS removal.

Naperville Water Quality Summary

EPA testing has detected PFAS "forever chemicals" in Naperville drinking water. Recent monitoring found a peak level of 18.6 ppt across 1 water system, representing an average of 3.6 ppt across 5 detected compounds.

Contamination Level: LOW – Low contamination – PFAS detected but at lower levels; monitoring continues.

Top Detected Compounds

  • lithium: 18.6 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)
  • PFPeA: 0.01 ppt
  • PFBA: 0.01 ppt
  • PFHxA: 0 ppt
  • PFBS: 0 ppt

Lead in Naperville Water

EPA Lead and Copper Rule testing has recorded 32 lead samples for Naperville water systems, with a 90th-percentile high of 0.024 mg/L (above the EPA 0.015 mg/L action level). There is no safe level of lead for children; if your home was built before 1986, a certified NSF/ANSI 53 lead-removal filter is recommended.

EPA Violations in Naperville

Naperville public water systems have 1 health-based EPA Safe Drinking Water Act violation on record, including Total Organic Carbon. Health-based violations mean a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

These figures come from the EPA's Unregulated Contaminant Monitoring Rule 5 (UCMR5) testing program, 2023-2025. UCMR5 is the most comprehensive national drinking water survey in US history, covering 66,000+ public water systems. Population of Naperville: approximately 149,540.

ZIP Codes Served

60540, 60563, 60564, 60565, 60566

What Naperville Residents Should Do

  1. Enter your exact ZIP code at knowyourexposure.com for address-level data
  2. Install an NSF/ANSI 58 reverse osmosis filter (removes 94-99% of PFAS)
  3. If you're in a high-exposure group (pregnant, young children), consider a PFAS home test kit
  4. Review your utility's Consumer Confidence Report (CCR) annually