When should I test my well water?

Municipalities must test their water supplies regularly to ensure the water is safe to drink. However, because there’s no requirement to test a private well except when it’s first drilled or the pump is changed, you’re responsible for making sure your well water is safe for drinking and bathing.
You should test your water on a regular basis. The types of land uses near your well determine which tests you should perform on your water supply.
Water Testing Frequently Requested Information.
Private Well Class

Free resources such as classes, webinars and library materials

Drinking Water From Household Wells Document

How wells are polluted, how to protect them, what pollutants contaminate the water and what testing is needed

Drinking Water from Private Wells Website
Water Testing Turnaround Times