Chicago draws clean water from Lake Michigan, but the city has an estimated 400,000 lead service lines connecting mains to homes, widely reported as the most of any U.S. city. Lead is the primary concern. Disinfection byproducts are present at levels below federal limits, and PFAS has not been detected in Chicago's testing to date. A filter certified for lead removal (NSF 53) is the minimum. A reverse osmosis system covers everything.
Is Chicago tap water safe to drink? Chicago's water meets EPA standards at the treatment plant. The concern is what it picks up after treatment, specifically lead from the city's estimated 400,000 lead service lines. In the inventory Chicago filed with Illinois EPA in April 2025, about 412,000 of roughly 491,000 service lines (about 84%) were lead, suspected lead, or galvanized lines requiring replacement. If your home was built before 1986, using a certified lead filter adds an important layer of protection.
Does Chicago water have lead in it? Chicago's municipal code required lead service lines until the national ban in 1986, leaving an estimated 400,000 lead connections, widely reported as the most of any U.S. city. Lead enters the water as it passes through these pipes. In Chicago's 2025 compliance sampling, the 90th percentile lead level was 8.2 to 9.4 ppb, with 5 homes above the EPA action level of 15 ppb. Researchers who analyzed 38,385 home tests from the city's free testing program (Huynh and colleagues, JAMA Pediatrics, 2024) reported detectable lead (1 ppb or more) in 69% of tests.
What is the best water filter for lead in Chicago? For lead removal specifically, any filter certified to NSF 53 for lead works. The ZeroWater pitcher is a good portable option: it is certified for lead and includes a meter, though the meter reads total dissolved solids and does not measure lead. For permanent installation, the Aquasana Claryum 3-Stage Max Flow under-sink system or AquaTru countertop RO add certified PFOA/PFOS reduction on top of lead.
Does Chicago water have PFAS? Not in testing to date. Chicago monitored 29 PFAS in its drinking water for four quarters of 2024 under EPA's UCMR5, and none were detected. Earlier sampling (UCMR3 in 2014 and an Illinois EPA study in 2020) was also non-detect. Check your specific zip code's results.
Should I get my Chicago water tested for lead? Yes, especially if your home was built before 1986. The City of Chicago offers free lead test kits: request one by calling 311 or through ChicagoWaterQuality.org. In the meantime, using a certified lead filter is a smart precaution, and the city advises running your tap for at least 5 minutes when water has sat unused for 6 hours or more (showering, laundry and dishwashing count toward that flushing).