Water Quality

Fresh water is an increasingly precious resource around the world. In Wisconsin, about 66% of the population drinks water drawn from over 750,000 private wells. Wells are safe, dependable sources of water if sited wisely, built correctly and maintained.

EPA regulations that protect public drinking water systems do not apply to privately owned wells. As a result, owners of private wells are responsible for ensuring that their water is safe from contaminants. Regular maintenance of your well is required to ensure the continued safety of your water and to monitor for the presence of any contaminants.

water safe to drink

Why Do Homeowners Sample Their Water?

Taste or odor changes, arrival of a new infant, and property transfers are some major reasons that local citizens have expressed for having their private well tested.

One of the simplest things you can do to take care of the health and well being of yourself and those you love is to test your well. It is up to private well owners to test their wells annually. The test will determine the most common well pollutants, bacteria, and nitrate level.

Did you know? In Rock county, 1 out of 7 wells test unsafe for bacteria and 1 in 4 test high for nitrates.

Be smart. Protect your health. Test your well annually!

Order a Water Test Kit

Rock County Well Water Testing Services

The Rock County Health Department conducts programs that protect ground water for drinking and other uses. We offer lab services for private well owners to test their water for nitrates, bacteria and fluoride. Water specialists distribute well water information, provide testing bottles and explain test results to well owners.

Samples are accepted:

  • North Office (Janesville)
    Monday through Wednesday 8:00am to 5:00pm & Thursday 8:00am to 12:00 Noon
  • South Office (Beloit)
    Monday through Thursday 8:00am to 9:30am



water lab infographic

As of 2006, Rock County Laboratory is 1 of 13 Public Health Laboratories in Wisconsin and is a member of the Wisconsin Public Health Laboratory Consortium. These labs together serve Wisconsin's 93 health jurisdictions.

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