Bacteria Testing

See our Water Testing Fees and Services page for additional water tests available!

How often should I test my well water for bacteria?

You should test your well every year for bacteria. In addition, test for bacteria if:

You notice a sudden change in your water's taste, appearance, or odor.
The water turns cloudy after rainfall or the top of the well was flooded.
You suspect a contamination source (sewage system, barnyard, etc.) is within 50 feet of your well.
Family members are experiencing unexplained flu-like symptoms.
Your water supply system has been serviced or you have made changes to the system.

How do I test my well water for bacteria?

Obtain sample bottles from the Environmental Health office.
When you are ready to sample, remove the aerator from the faucet. Dip the tip of the faucet into a container of bleach for 30 seconds. Leave the bleach on the faucet for 5 minutes to kill any bacteria present.
After disinfection, turn on the cold water and let it run for 5 minutes. While the water is running, remove the lid from the sample bottle. DO NOT touch the interior of the bottle or lid, and leave any pill or powder in the bottle! Fill the bottle to about one inch from the top and replace the lid.
Put the aerator back on the faucet.
Return the sample to the Environmental Health office. Samples must be delivered to our office by 3:00 p.m. Monday through Friday. It is best to collect the sample just before delivery to our office. Samples should be refrigerated or chilled while stored or transported. On dates prior to holidays, no samples will be accepted.
Our office will call you if bacteria is present in your well. Otherwise, you will receive a copy of your results in the mail.
If you receive a notice that your sample is positive for bacteria, you may want to disinfect your well.

For more information, please contact: