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Is Cahokia, IL tap water safe?

2 utilities serve Cahokia, by EPA’s records. Here is what EPA’s and Illinois’s records show for each, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

Neither of the 2 utilities serving Cahokia has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Illinois’s records.

Cahokia Heights, which serves the most people here, has 1 result above EPA’s health benchmark. The worst: Lithium at 21.8 ppb, above EPA’s health benchmark. A health benchmark is a level EPA screens with, not a legal limit.

A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Cahokia’s ZIP codes, from EPA’s estimates.

Water testing near Cahokia

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Illinois certifies.

The 3 labs Illinois certifies closest to Cahokia, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Teklab, Inc.

    Collinsville, IL · about 13 miles

    Certified for bacteria

    (618) 344-1004

  • Pace Analytical Services, LLC - Hazelwood

    Hazelwood, MO · about 19 miles

    Certified for bacteria

    (314) 432-0550

  • Precision Water Lab

    Centralia, IL · about 56 miles

    Certified for bacteria

    (618) 533-0758

Illinois Department of Public Health: Coliform bacteria and nitrate testing for private wells, with sample bottles from your local health department, or from the department's nearest regional office where there is none. You mail the sample to the lab, and results come back through the health department. Well Sampling for Coliform & Nitrate, Illinois Department of Public Health.

All 30 certified labs for Illinois

ZIP codes in Cahokia

Which ZIP codes are in Cahokia: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Illinois Department of Public Health, certified water microbiology laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Cahokia

Towns nearby with a page of their own.

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