Tap Water Results

Is Granite City, IL tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Illinois American Water – Granite City. 3 PFAS were detected below the limits.

2 public water systems serve parts of Granite City. The largest, Illinois American Water – Granite City, serves 33,572 people. Your water bill names your system.

Largest system

Illinois American Water – Granite City

33,572 people · Surface water · EPA ID IL1195030

Buys treated water from Illinois American Water – East St Louis.

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 6 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Across Illinois, 13 of 479 water systems EPA tested had PFAS above a 2024 federal limit, and 18 systems were above the lead action level in results from the last five years. Illinois results.

Granite City homes and lead pipes

84%
of homes built before 1980 (Illinois 64%, US 50%)
32%
built before 1950 (Illinois 26%)
27%
of households rent (Illinois 33%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Granite City city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Granite City

  • Mitchell Public Water District
    5,253 people · Purchased surface water · Illinois · reported ZIPs here
    No PFAS above limits

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Edwardsville 9 mi
Edwardsville Water System
Edwardsville Water SystemNone above limits0 ppb
Alton 12 mi
Illinois American Water – Alton
Illinois American Water – AltonNone above limits3 ppb
O'Fallon 15 mi
O'Fallon Water System
O'Fallon Water SystemNone above limits0 ppb
Belleville 16 mi
Illinois American Water – Homer Township
Illinois American Water – Homer TownshipNone above limits0 ppb
Springfield 78 mi
Springfield Water System
Springfield Water SystemNone above limits0 ppb
Decatur 101 mi
Decatur Water System
Decatur Water SystemNone above limits0 ppb
Granite City ZIP codes (1)
  • 62040

Questions

Is Granite City tap water safe to drink?

Illinois American Water – Granite City has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Granite City, IL?

2 public water systems serve parts of Granite City. The largest is Illinois American Water – Granite City (33,572 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Granite City tap water have PFAS?

Illinois American Water – Granite City had 3 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Granite City homes have lead pipes?

Census estimates put 84% of Granite City homes as built before 1980 (Illinois: 64%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Illinois American Water – Granite City's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.