US Water Score: C
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
24.0
|
15 ppb | 1 ppb |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFBA | 5.9 ppt | No standard | 500 ppt | No federal MCL shown |
| PFPeA | 5.3 ppt | No standard | — | No federal MCL shown |
| PFHxA | 4.7 ppt | No standard | 400 ppt | No federal MCL shown |
| PFBS | 3.7 ppt | 2000 ppt | 100 ppt | Below comparison value |
Water Quality Summary
Tap water quality in Naperville, Illinois (60564) receives an overall grade of C (Mixed record-based signals) with a score of 62 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is roughly in line with the Illinois state average of 64. Compared to the national average (75), this area scores significantly lower. The area is served by 2 water systems providing water to approximately 183,000 people, using surface water sources. PFAS testing detected 4 compounds, all below the EPA final MCL values used for comparison. The area has 22 violations over the past 5 years, though none were classified as health-based.
A score of 62/100 indicates fair performance in the US Water Score model for Naperville, IL. The records show noteworthy concerns, such as elevated contaminant levels, violation history, or both. Review the detailed contaminant data and official utility reports before making decisions.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Common Questions
Naperville, Illinois receives an internal US Water Score grade of C (Fair) with a score of 62/100. Our model found some system-level concerns, such as violation history or elevated contaminant levels. Review your utility's Consumer Confidence Report and consult a qualified professional for household-specific health questions.
ZIP code 60564 is served by 2 water systems using surface water sources, providing water to approximately 183,000 people. Surface water systems are more susceptible to contamination from agricultural runoff, industrial discharge, and weather events, but typically undergo more extensive treatment including filtration and disinfection.
Lead levels in the public-system record for Naperville, Illinois are 24.0 ppb, above the currently applicable EPA action level of 15 ppb. EPA's Lead and Copper Rule Improvements lower that action level to 10 ppb when the new requirements take effect. This system-level result does not measure an individual tap; consider a certified lead-removal filter and independent tap testing.
4 PFAS compounds were detected in water serving Naperville, Illinois, with reported values below the EPA final MCL values used by this site. This comparison is informational: federal compliance timelines and the status of some PFAS standards are still evolving. Activated carbon or reverse osmosis filters can reduce some PFAS when appropriately certified and maintained.
Water systems serving Naperville, Illinois have received 22 violations in the last 5 years. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS), residents in Naperville, Illinois should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.