Terms of use

Last updated September 29, 2026. By using Radon by ZIP you agree to these terms.

Information, not professional advice

EPA’s radon zones describe the predicted average for a whole county. Homes next door to each other can have very different radon levels, and EPA says the map should not be used to decide whether a single home needs testing. The only way to know your level is to test. This site is general information, not medical or engineering advice.

Tools and estimates

Our calculators and lookups give estimates based on the public sources named on each page. They can be wrong for your situation, and the underlying rules and data can change. Check the original source and, where it matters, a qualified professional before you act.

Letters and templates

You may copy, edit, and use any template or checklist on this site for your own personal or household use. You may not republish our pages in bulk.

Links to other sites

We link to government agencies, courts, universities, and other outside sources. We do not control those sites and are not responsible for their content.

Advertising

The site is supported by ads served by Google. Ads are labeled. We do not endorse advertised products or services.

No warranty and limit of liability

The site is provided “as is,” without warranties of any kind. To the fullest extent allowed by law, we are not liable for any loss or damage arising from your use of the site or reliance on its content.

Changes

We may update these terms. The date at the top shows the latest version.

Contact

hello@radonbyzip.com

This site is operated by Directory Assistance Group. Questions about these terms or your data: hello@directoryassistancegroup.com.