Tap Water Results

Is Mount Prospect, 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 Mount Prospect Water System.

2 public water systems serve parts of Mount Prospect. The largest, Mount Prospect Water System, serves 41,000 people. Your water bill names your system.

Largest system

Mount Prospect Water System

41,000 people · Purchased surface water · EPA ID IL0311980

Buys treated water from Northwest Suburban Municipal Jawa.

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: 2.22 ppb at the 90th percentile (Nov 2026, 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.

Mount Prospect homes and lead pipes

76%
of homes built before 1980 (Illinois 64%, US 50%)
5%
built before 1950 (Illinois 26%)
31%
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. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

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

Other water systems serving Mount Prospect

  • Illinois American Water – Chicago Suburban
    11,187 people · Purchased surface water · Illinois · reported ZIPs here
    No PFAS above limits

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Des Plaines 3 mi
Des Plaines Water System
Des Plaines Water SystemNone above limits5.7 ppb
Arlington Heights 3 mi
Arlington Heights Water System
Arlington Heights Water SystemNone above limits7.6 ppb
Wheeling 5 mi
Wheeling Water System
Wheeling Water SystemNone above limits1.21 ppb
Elk Grove Village 5 mi
Elk Grove Village Water System
Elk Grove Village Water SystemNone above limits0 ppb
Glenview 6 mi
Glenview Water System
Glenview Water SystemNone above limits10 ppb
Park Ridge 6 mi
Park Ridge Water System
Park Ridge Water SystemNone above limits6.79 ppb
Mount Prospect ZIP codes (1)
  • 60056

Questions

Is Mount Prospect tap water safe to drink?

Mount Prospect Water System 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 Mount Prospect, IL?

2 public water systems serve parts of Mount Prospect. The largest is Mount Prospect Water System (41,000 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Mount Prospect tap water have PFAS?

None detected above EPA's reporting limits. Mount Prospect Water System had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Mount Prospect homes have lead pipes?

Census estimates put 76% of Mount Prospect 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. Mount Prospect Water System'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.