Does Chicago have lead pipes?

Yes - if you're in Chicago, this is the one worth checking on. According to the US EPA, Chicago has the most lead service lines (the pipe linking a home to the main) of any US city, with the city estimating roughly 412,000 lines known or suspected to contain lead. Chicago was granted an extended timeline under federal rules to replace them, so in the meantime knowing your own line's material is the useful step.

Is nitrate a problem in Illinois drinking water?

Mainly in farm-belt communities, so it depends where you live. According to EWG analysis of state testing, elevated nitrate from agricultural runoff was found in 217 Illinois community water systems serving nearly 1.9 million people. The threshold to know is 10 mg/L - above that, nitrate is a regulated health concern - and if you're in a rural system, your local report will tell you where you stand.

How do I know if my Illinois home has a lead service line?

There's a clear path to find out, so you don't have to guess. Under the Illinois Lead Service Line Replacement and Notification Act, water systems are inventorying and reporting lead lines, and the Illinois EPA keeps that information public. The direct route is to contact your water utility for your address-specific status; while you wait to confirm, a lead-certified filter is a reasonable interim measure if your home is older.

Water quality

Illinois water quality

If you're in Illinois, the water from your tap generally meets federal standards - it's regulated by the Illinois EPA - so start from a place of reassurance. There are two well-documented challenges worth knowing about, and which one applies depends on where you live. According to the US EPA and Illinois EPA, Illinois has more lead service lines - the old pipes connecting homes to the water main - than any other state, roughly one million, with Chicago alone having the most of any US city. And according to EWG and Illinois EPA data, nitrate from farm runoff affects many smaller community systems out in the corn belt. So city dwellers should think about lead pipes, rural and small-town residents about nitrate - and either way, your local report is the place to confirm what's yours.

Documented considerations

Lead

According to the US EPA, Illinois has about one million lead service lines, the most of any state, and Chicago has the most of any city (the city estimates roughly 412,000 of its lines are known or suspected to contain lead).

What removes lead →

Nitrate

According to EWG analysis of state data, elevated nitrate from fertilizer and manure runoff was detected in the tap water of 217 Illinois communities serving close to 1.9 million people, with contamination worsening in many smaller rural groundwater systems.

What removes nitrate →

PFAS

A 2021 Illinois EPA statewide investigation sampled finished drinking water at over 1,400 entry points and found PFAS in a number of systems, with the agency later notifying multiple community water systems of detections exceeding state groundwater standards.

What removes pfas →

Hardness

Much of Illinois, which relies heavily on groundwater and Great Lakes sources, reports moderately hard to hard water. Hardness is an aesthetic and scale concern rather than a health hazard.

What removes hardness →

EPA compliance snapshot

From the EPA ECHO Safe Drinking Water Act database, Illinois community water systems carrying one or more violations on record:

481

systems with a violation on record

with a health-based violation

flagged serious violators

Most common violation categories

Revised Total Coliform Rule (185)
Nitrate (149)
Public Notice (118)
Lead and Copper Rule (71)
Total Haloacetic Acids (HAA5) (70)
TTHM (69)

Counts are public EPA ECHO figures. 'Health-based' means a system carries at least one health-based violation flag in ECHO. A violation on record is not a statement that current tap water is unsafe; most systems return to compliance. Always check your utility's Consumer Confidence Report for current status. Source: EPA ECHO, retrieved 2026-07-01.

Certified filters for Illinois's main concerns

7.5
AquaTru Classic Countertop RO
A no-plumbing countertop 4-stage RO purifier certified to NSF standards for lead, PFAS, fluoride and arsenic with an efficient drain ratio.
lead, nitrates, pfas
6.6
Waterdrop G3P800 Tankless RO
A tankless 800 GPD reverse-osmosis system IAPMO-certified to NSF/ANSI 42, 53, 58 and 372 for a broad contaminant list including lead, PFAS, arsenic, nitrate and fluoride.
lead, nitrates, pfas
8.4
Brita Elite Pitcher (10-Cup)
A pour-through pitcher whose Elite filter is certified to reduce lead, mercury, cadmium and more, with a long 120-gallon cartridge.
lead, pfas
7.5
Culligan US-EZ-4 Under-Sink
An under-sink filter genuinely IAPMO certified to NSF/ANSI 42, 53 and 401 for lead, cysts, VOCs, mercury and PFOA/PFOS.
lead, pfas
7.2
Aquasana AQ-5200 Under-Sink
Certified for lead and PFAS, cheap per gallon, marketing matches the certified scope.
lead, pfas
4.9
ZeroWater 5-Stage Pitcher (7-Cup)
A five-stage ion-exchange pitcher certified for lead, chromium-6 and PFOA/PFOS - but a short 15-gallon filter makes it costly to run.
lead, pfas

FAQ

Does Chicago have lead pipes?: Yes - if you're in Chicago, this is the one worth checking on. According to the US EPA, Chicago has the most lead service lines (the pipe linking a home to the main) of any US city, with the city estimating roughly 412,000 lines known or suspected to contain lead. Chicago was granted an extended timeline under federal rules to replace them, so in the meantime knowing your own line's material is the useful step.
Is nitrate a problem in Illinois drinking water?: Mainly in farm-belt communities, so it depends where you live. According to EWG analysis of state testing, elevated nitrate from agricultural runoff was found in 217 Illinois community water systems serving nearly 1.9 million people. The threshold to know is 10 mg/L - above that, nitrate is a regulated health concern - and if you're in a rural system, your local report will tell you where you stand.
How do I know if my Illinois home has a lead service line?: There's a clear path to find out, so you don't have to guess. Under the Illinois Lead Service Line Replacement and Notification Act, water systems are inventorying and reporting lead lines, and the Illinois EPA keeps that information public. The direct route is to contact your water utility for your address-specific status; while you wait to confirm, a lead-certified filter is a reasonable interim measure if your home is older.

Sources

Not sure how to read your local report? See our guide on reading a water quality report.