For homeowners in the Denver metro area, the frequency of water testing depends on your water source and specific environmental factors. According to guidelines from the EPA and One Nation Plumbing, Heating, and Air, you should follow these testing intervals:

Annual Testing: Perform comprehensive well water testing at least once a year. This should focus on detecting bacteria (such as E. coli), nitrates, and pH levels to ensure ongoing safety.

Every Three Years: Test for heavy metals and other specific contaminants at least every three years, unless local conditions change.

More Frequent Testing: You should test more often if you notice changes in water color, odor, or taste. Immediate testing is also recommended following significant events such as flooding or nearby construction, which can create new contamination pathways.

Quarterly Monitoring: If previous tests have shown concerns or if you are closely monitoring a specific issue, quarterly inspections and tests are advised to track trends and ensure your treatment systems are functioning correctly.


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