Copper in Illinois Drinking Water — 178 ZIPs Tested

Copper Contamination in Illinois

ZipCheckup analyzed drinking water data across 1,583 ZIP codes in Illinois for copper contamination. 178 ZIP codes have reported copper detections, and 147 have EPA violations on record.

The violation rate for copper in Illinois is 9.3% of all ZIP codes — higher than the national average.

EPA Standard for Copper

The EPA maximum contaminant level (MCL) for copper is 1.3 mg/L (action level), governed by the Lead and Copper Rule. Water systems that exceed this limit must take corrective action and notify consumers.

Worst ZIP Codes for Copper in Illinois

These ZIP codes reported the highest copper levels in Illinois based on CCR reports and EPA data:

Lowest Copper Levels in Illinois

These ZIP codes had the lowest reported copper detections in Illinois:

Health Effects of Copper

Short-term exposure to copper above the action level causes gastrointestinal distress (nausea, vomiting, diarrhea). Long-term exposure can cause liver and kidney damage. People with Wilson's disease are particularly sensitive.

How to Remove Copper From Drinking Water

The most effective treatment for copper removal is Reverse Osmosis or NSF 53 Carbon Block. Look for filters certified under NSF 53 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see copper data for your specific water system in Illinois.