Across Dekalb, Illinois, federal monitoring data has captured Lead in water samples at detectable concentrations in the most recent available reporting cycle.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

Lead in Dekalb Tap Water

Lead has been detected in Dekalb, Illinois drinking water at a maximum level of 11 ppb — below the EPA action level of 15 ppb (action level).

This analysis covers 51,530 residents across 1 ZIP code in Dekalb.

Dekalb's overall water quality grade is D (42/100).

Is Lead in Dekalb Water Safe?

Lead was detected in Dekalb water but currently falls within EPA limits. However, some health organizations argue the EPA action level may not be protective enough — the CDC states there is no safe level of lead for children.

If you are concerned, a reverse osmosis or nsf 53 carbon block filter can reduce lead levels further.

Lead Levels by ZIP Code

Average lead level across Dekalb: 11 ppb

Health Effects of Lead

• Brain development delays and reduced IQ in children
• Behavioral problems and learning disabilities
• High blood pressure and kidney damage in adults
• Increased risk of premature birth in pregnant women

Health risk severity: High. Governed by the Lead and Copper Rule Revisions (LCRR/LCRI).

How Lead Gets Into Drinking Water

• Corrosion of lead service lines (pipes connecting water main to home)
• Lead solder in copper plumbing joints (pre-1986 homes)
• Brass fixtures and faucets manufactured before 2014
• Stagnant water that sits in lead-containing pipes overnight

What to Do About Lead in Dekalb Water

1. Install an NSF 53 or NSF 58 certified filter at kitchen sink
2. Run cold water for 30 seconds before using for drinking or cooking
3. Use cold water only for cooking and preparing formula
4. Consider whole-home reverse osmosis if lead service line is present

Look for filters certified under NSF 53 / NSF 58 for lead removal.

Related

• Lead — National Overview
• Lead in Illinois
• Illinois Water Quality
• Dekalb Water Quality
• Check Your ZIP Code