Your water has answers.
We help you find them.
Plain-language water quality guidance for homeowners, well owners, pool owners, and growers. No lab jargon. No scare tactics. Just what you actually need to know.
Browse by topic
Pick the area that fits your situation.
Your Water
Contaminants, sources, and what's in your tap or well.
Water Testing
At-home test kits and mail-in labs compared side by side.
Filters & Treatment
RO systems, softeners, whole-house filters — which one works for your problem.
Well Water
Private wells aren't regulated. You're responsible for testing. Start here.
Learn
EPA limits, NSF standards, and how to read your water quality report.
Tools & Resources
Contaminant lookup, filter decision guide, and water quality references.
Most-read right now
Popular questions we get every week.
How we research
Every contaminant page cites actual studies by name and year — no vague attribution. Every filter recommendation references NSF certification data or published removal rates.
We don't get paid to recommend specific products. Affiliate commissions come after testing and ranking, not before. See our review policy.
Where to start
If you have city water, start with Your Water to learn what the EPA requires utilities to test for and what they don't.
If you have a private well, start with Well Water. The EPA doesn't regulate wells. You're responsible for testing.