Understand your tap water, then treat it with confidence
Your water utility publishes a report every year on what’s in your water. We turn those reports into plain English and match each issue to the filter certification that addresses it. Every fact links to its source and shows the date we checked it.
Start here
Tap water by city
Disinfectant, hardness, lead service lines, and EPA PFAS results for 25 cities, each linked to the utility’s report.
Which certification does what
NSF/ANSI 42, 53, 58, 401 and 44 in one table, sourced to NSF and EPA.
How we check facts
Utility reports, EPA, and NSF first. Anything we couldn’t confirm is labeled.
On a private well?
Utility reports don’t cover private wells. Our sister site Private Well Primer covers free and low-cost well water testing in every state.
Coming next
More cities, a chloramine filter guide, a certification decoder, filter type comparisons, and softener and PFAS guides.