About and methods
Sulfur Water Filter is an independent guide to rotten-egg (hydrogen sulfide) smell in household water. It’s written for homeowners who want to understand their water before spending money on it.
Where the numbers come from
Every limit, threshold and health statement on this site is taken from a primary source and linked at the bottom of the page. Those sources include:
- the U.S. Environmental Protection Agency (EPA) and the CDC;
- the U.S. Geological Survey (USGS);
- state health departments;
- university extension services, such as Penn State, Virginia Tech, Minnesota and Texas A&M.
Equipment specs, such as how much iron a filter is rated for, come from the maker’s own published pages and are labelled that way.
Private wells aren’t covered by EPA drinking water rules. We use EPA’s public water limits as a benchmark because that’s what labs and health departments compare well results against.
What we don’t do
We don’t install or lab-test equipment ourselves. Reviews are based on published specifications, independent certification listings where they exist, and extension-service treatment guidance. Each one says what we couldn’t verify.
We don’t give medical advice. For health questions about your water, contact your state health department or a state-certified lab.
Tools
The smell check runs entirely in your browser. The numbers you type are never sent to us.
How the site makes money
Some links go to SpringWell (water treatment equipment) and Tap Score (mail-in lab tests). If you buy through them, we may earn a commission at no extra cost to you. We don’t accept payment for placement, and every guide says when the cheaper fix is the right one, even when it earns us nothing. See the affiliate disclosure.
Corrections and updates
Each guide shows the date it was last checked. If you spot an error, a broken source or an outdated limit, please tell us and we’ll fix it.