A federal rule required Chicago to warn approximately 900,000 residents that their drinking water flows through lead pipes — by November 2024. As of July 2025, the city had notified roughly 7% of them.
That's the Chicago water quality story in 2026 that most residents haven't heard.
The Lead Pipe Situation
Chicago has more lead service lines than any other city in the United States — approximately 412,000 of the city's ~490,000 service lines are made of lead or may contain lead components. These are the pipes that carry water from the street main into your home.
The water that leaves Chicago's treatment plants — drawn from Lake Michigan at offshore intake cribs and processed at the Jardine and South Water purification plants — is good. Lake Michigan is a high-quality source, and Chicago's treatment is effective. The problem is the delivery system.
When water sits in lead service lines overnight, lead leaches into it. The first water out of your tap in the morning can have significantly higher lead concentrations than water that's been running for 30 seconds. You can't see it, taste it, or smell it. And in about 1 in 5 homes tested in Chicago, levels have been found high enough to affect brain development in children.
What the city's 90th percentile number doesn't tell you: Chicago's 90th percentile lead level in recent Consumer Confidence Reports has generally stayed below the EPA's 15 ppb action level — but that metric is an average across many test sites. If your specific service line is lead and hasn't been replaced, your personal exposure could be much higher than the citywide figure suggests.
The Notification Failure
Under the federal Lead and Copper Rule Revisions (2021), water utilities with lead service lines were required to notify affected customers annually. Chicago's deadline for initial notifications was November 16, 2024.
Reporting from Inside Climate News, Grist, and WBEZ in July 2025 found that Chicago had sent letters to only about 7% of the approximately 900,000 affected addresses — eight months past the required deadline. The city was mailing roughly 3,000 letters per week, a pace that would take years to complete the required notifications.
The city's own records identify your address and whether it's connected to a lead service line. But many residents have no idea their home's pipes are lead because they never received the required notification.
How to Find Out If Your Home Has Lead Pipes
You have several options:
Check the city's lead service line map. Chicago's Department of Water Management maintains a map of known and suspected lead service lines at chicago.gov/water. Enter your address to see what the city's records show about your service line.
Get a free water test. The city offers free residential water testing through an independent certified laboratory. Request a kit through the Chicago Department of Water Management. If your test comes back elevated, the city provides free filter pitchers and six cartridges certified to remove lead.
Run the tap. Before drinking water that's been sitting in pipes overnight, run cold water for 2–3 minutes. This flushes water that's been in contact with your lead service line. Use flushed water for drinking and cooking; unrun water for things like watering plants.
→ Enter your ZIP at PureCity to see lead risk data and water quality history for your neighborhood.
Other Contaminants in Chicago Water
Lead is the primary concern, but Chicago's water has additional issues worth knowing about:
Disinfection byproducts (TTHMs and HAAs): Chlorine reacts with organic matter from Lake Michigan to form these compounds. Chicago's levels are below federal limits but above EWG health guidelines. Long-term exposure is associated with increased bladder cancer risk. Activated carbon filtration removes most DBPs.
Chromium-6: Chicago's water tests have shown chromium-6 at approximately 0.19 ppb — about 9–10 times higher than EWG's health guideline of 0.02 ppb. No federal limit exists for chromium-6 specifically; it falls under the total chromium limit of 100 ppb, which Chicago water easily meets. Reverse osmosis removes chromium-6 effectively.
Radium: Naturally occurring radioactive material has been detected at around 0.89 pCi/L — below the EPA limit of 5 pCi/L but well above EWG's health-based threshold. Low-level concern, but worth filtering for drinking water.
Hard water: Chicago water averages 130–150 ppm hardness (about 8 grains per gallon), classifying as hard. Not a health issue, but causes scale buildup on fixtures and appliances and can reduce the life of water heaters and dishwashers.
What Filter to Use in Chicago
Given that lead is the most pressing concern — and that it can't be removed by standard pitcher filters — your filter choice matters.
For lead specifically: Any filter you use must be certified to NSF/ANSI Standard 53 for lead reduction. This is not the same as NSF/ANSI 42, which only covers taste and odor. Check the certification before buying.
Best options for Chicago residents:
Faucet-mount (simplest):
- PUR PLUS Faucet Filter (~$35) — NSF 53 certified for lead, installs in minutes. Most practical for renters or anyone who doesn't want an under-sink install.
Under-sink filter (best balance of performance and cost):
- Frizzlife SK99 (~$90) — NSF 53 certified, direct-connect (no drill required), three-stage including lead and chloramine reduction
Pitcher (portable, no installation):
- Clearly Filtered Pitcher (~$90) — independently certified to remove lead, chromium-6, PFAS, and 360+ contaminants
Reverse osmosis (most complete):
- APEC ROES-50 Under-Sink RO (~$215) — removes lead, chromium-6, radium, DBPs, and nearly everything else; NSF 58 certified
- Bluevua RO100ROPOT-LITE Countertop RO (~$299) — no installation, plug-in countertop unit for renters
Important: Do not rely on your refrigerator filter for lead protection unless it is explicitly NSF 53 certified for lead. Many are not. Check before assuming.
Lead Service Line Replacement: What the City Is Doing
Chicago has two replacement programs:
- Equity Program: Free replacement for residents who meet income requirements.
- Homeowner-Initiated Program: Waives up to $5,000 in permit fees for residents who want to replace their line at their own expense.
The catch: at the city's current replacement pace, completing the full replacement of 412,000 lines will take approximately 50 years — 30 years longer than the federal requirement. In the meantime, a point-of-use filter at your kitchen tap is the most practical immediate protection.
For full details on the replacement programs: chicago.gov/water.
The Bottom Line for Chicago Residents
Chicago's water source is excellent. The treatment is solid. The problem is infrastructure that was built a century ago and will take decades to fully replace.
If your home was built before 1986 — and especially if you have children under 6, are pregnant, or are planning to become pregnant — a lead-certified filter at your kitchen tap is a low-cost, high-value protective measure. The free testing from the city is the right first step. Then filter based on what you find.
Related Articles
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Sources: City of Chicago Department of Water Management · Inside Climate News / Grist / WBEZ: Chicago Lead Pipe Notification Failure, July 2025 · EWG Tap Water Database: Chicago · EPA Lead and Copper Rule Revisions · Frizzlife Chicago Water Quality Guide · NSF Certified Products Database