Private Well Testing Available With County Department Of Health

Testing your well regularly is the only way to determine whether well water is safe to drink as many contaminants are colorless and odorless.  Water from a public or municipal water system is regularly tested for contaminants regulated by Federal and state standards. 

Bacteria and chemicals can get into well water and contaminate it in different ways. Some bacteria and chemicals occur naturally.  Contaminants such as nitrate can come from animal waste, wastewater, flooded sewers, polluted storm water runoff, fertilizers, agricultural runoff, or decaying plants.  High levels of nitrate in drinking water can cause illness in young children and pregnant women.  Coliform bacteria are microbes found in the digestive systems of warm-blooded animals, in soil, on plants, and in surface water.

MCDH will test water from private wells for nuisance chemicals resulting in water hardness, iron, discoloration and odor.  Additional charges will apply. Sampling kits can be picked up at MCDH locations in Woodstock, Crystal Lake or at one of eight drop-off centers.  Samples can be dropped off for testing on Tuesday mornings between 9:00am and 12:00pm at the following sites: 

• Algonquin Townships Office, 3702 Route 14, Crystal Lake, (847) 639-2329
• Dorr Township Office, 1039 Lake Avenue, Woodstock  (815) 338-0125
• MCDH, 100 N Virginia Street, Crystal Lake IL (815) 459-5151
• McHenry Township Office, 3703 Richmond Road, McHenry  (815) 385-5605
• Nunda Township Office, 3510 Bay Road, Crystal Lake (815) 459-4011
• City of Marengo, City Hall, 134 E. Prairie Street, Marengo  (815) 568-7112
• City of Harvard, Police Department, 201 W Front Street, Harvard (815) 943-4431
• Richmond Township Office, 7812 South Route 31, Richmond (815) 678-0077
• Grafton Township Office, 10109 Vine Street, Huntley (847) 669-3328

For more information, contact MCDH’s Environmental Health Division at 815-334-4585 or visit www.mcdh.info.