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Interpret Results

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The Laboratory Services Division strives to provide clear reports to customers, however sometimes customers have additional questions about how to interpret the report and what the results mean.


Several links are provided below to assist customers with interpreting water testing results.


If you have additional questions about any testing results, send your questions to the lab by E-mail at cdphe.lab@state.co.us.



If you have received your water test results, the useful tool at the link below will assist you in evaluating your results.

Generally, radon is not a problem with public drinking water systems because during the water treatment process aeration releases dissolved radon to the atmosphere. However, if the water supply is from a private well, radon levels could be unacceptably high. The recommendation is to test the well water if the air radon concentrations in the occupied dwelling are above 4 pCi/L.

The EPA does not currently have an established Maximum Contaminant Level (MCL) for radon in drinking water.