State-certified labTakes homeowner samples

McHenry County Health Department Laboratory

Woodstock, IL · McHenry CountyCertified laboratory

Call (815) 334-4585
WebsiteDirections
Certification
State certified
list checked September 30, 2026
Certificate
17539
Illinois program
Tests listed
1
Coliform Bacteria
Homeowner samples
Yes
Drop-off

About McHenry County Health Department Laboratory

McHenry County Health Department Laboratory is a certified laboratory in Woodstock, IL (McHenry County). It is on the Illinois drinking water program's list of certified laboratories (certificate 17539), and we last checked the list on September 30, 2026.

The lab takes samples from homeowners.

Before you go: Certified by the Illinois Department of Public Health for drinking water microbiology (IDPH lab 17539; certified list revised December 4, 2025). County health department laboratory: sells bacteria and nitrate sample kits to well owners at the counter (usually to residents of neighboring counties too), with the results explained by the department's environmental health staff; check hours and drop-off days before you sample.

This profile is built from the official state list of certified drinking water laboratories, checked on September 30, 2026. Well Water Insider does not rate or endorse labs. Run this lab? Claim the profile to add prices, turnaround times, hours and a description.

Certification and services

State certified
Certification number
17539
Certified by
Illinois drinking water program
Certified for
Microbiology
Last verified
September 30, 2026

Listed on the official state certified laboratory list.

How to test your water here

How this lab takes samples, based on its listing. Call to confirm hours, bottles and prices.

Homeowner samplesYou can collect and drop off your own sample
Mail-in kitsNot listed, call to confirm
Walk-in drop offNot listed, call to confirm

Published lab fees in Illinois: $30 for a bacteria test that also covers nitrate. County health department lab: one $30 test covers coliform, E. coli and nitrate (McHenry County). Prices at this lab may differ.

  1. 1

    Call for the right bottles

    Bacteria samples need a sterile bottle from the lab. Chemistry samples usually take a clean container the lab supplies.

  2. 2

    Collect from a cold tap before treatment

    Skip softeners and filters. Remove the aerator, run the water 3 to 5 minutes, then fill without touching the inside of the cap.

  3. 3

    Keep it cold and deliver within 24 hours

    Bacteria samples are time-sensitive. Use a cooler with ice packs and hand it in or ship it the same day.

  4. 4

    Read the report against the standards

    Compare results with EPA drinking water limits. If anything is over, our problem pages explain what it means and how to treat it.

Tests this lab is listed for

From the state certification list and the lab's own listing. Ask which ones it runs for homeowners.

Coliform Bacteria

Total coliform and E. coli. The test the CDC recommends every year for every private well. Learn more

Location

667 Ware Road, Woodstock, IL 60098

Lab address

Questions about McHenry County Health Department Laboratory

Is McHenry County Health Department Laboratory state certified?

Yes. It is on the Illinois list of laboratories certified for drinking water testing, last checked September 30, 2026.

What can McHenry County Health Department Laboratory test well water for?

Its listing covers coliform bacteria. Call to confirm prices and which tests it runs for private well owners.

Can I bring my own well water sample?

Yes, the listing says it takes homeowner samples. Get the right bottle from the lab first, especially for bacteria.

How do I contact McHenry County Health Department Laboratory?

Call (815) 334-4585 and visit the lab's website. The address is 667 Ware Road, Woodstock, IL 60098.

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