Who we are
WaterListed is owned and operated by ZILIO Marzena Rewers, ul. Gliwicka 35, 42-600 Tarnowskie Góry, Poland (e-mail [email protected]; full details in the legal notice). We are a directory. We are not a laboratory, a government agency or a water-treatment company, and we are not affiliated with any state agency or the U.S. EPA.
Where the data comes from
Every listing is taken from an official list: drinking-water labs from state laboratory certification lists (Wyoming’s from the U.S. EPA Region 8 list), backflow testing companies from water utilities’ published approved-tester lists. Each page links to the list it came from and shows the list version and the date we fetched it. The underlying facts (a lab’s name, address and certifications) belong to the public record. We do not claim them as ours.
What is ours
The text we wrote (explainers, descriptions, labels), the design and code of this site, and our way of selecting, linking and arranging the listings are © 2026 ZILIO Marzena Rewers. You may link to any page and quote short excerpts with a link back to the page.
What the service is
WaterListed is a free information service: a searchable directory of certified drinking-water labs and approved backflow testing companies, guides and explainers, data studies (with their data available to journalists and researchers on request), and browser tools (Check my ZIP, the which-tests checklist, the result checker, the well volume calculator), plus a contact form. You start using it by opening any page and stop by leaving the site; there is no account and nothing to cancel.
Technical requirements
A current web browser with HTML and CSS support and an internet connection. The browser tools need JavaScript; every directory page works without it. The site sets no cookies and stores nothing on your device.
Your conduct
Do not send unlawful content through the contact form or any other channel of the site, and do not use the site in a way that disrupts it or other users.
Complaints
To complain about the service, write to [email protected] with a short description of the problem. We reply within 14 days.
No bulk copying
Please do not use bots, scrapers or other automated means to copy substantial parts of this site’s pages or compiled data, or to republish them as another directory or dataset, without our written permission. This does not apply to insubstantial parts. Journalists and researchers who need compiled data can ask us for it. Search engines and ordinary browsing are welcome. If you need the underlying data, the original state lists are linked on every page.
Not advice
Everything on WaterListed is general information. It is not medical, legal, engineering or other professional advice, and it does not replace your state or local health department, a doctor, a certified laboratory or a licensed well contractor. Ask them about your own situation.
Do-it-yourself procedures
Some guides describe procedures that state agencies publish for well owners, such as disinfecting a well with chlorine bleach. These involve real hazards, including chlorine and live electrical wiring. Follow your own state’s current procedure and the product label, keep children and animals away, and hire a licensed well contractor if you are unsure. You carry out any procedure at your own risk.
No guarantee
We work from official sources and date what we cite, but information can be out of date, incomplete or wrong, including because a state list or a federal rule changes after we check it. A listing is not an endorsement, and it does not mean a lab is certified for every test or accepts your sample. Confirm the specific test, the method and the lab’s current status with the lab and the state program before you send a sample. The site and its tools are provided “as is” and “as available”, without warranties of any kind.
Limitation of liability
To the extent the law allows, ZILIO Marzena Rewers is not liable for any loss or damage arising from the use of, or reliance on, this site, its tools or its content, including decisions about testing, treatment, drinking water or property. Nothing in these terms limits liability that cannot be limited under the law that applies to you.
Risks of using the internet
As with any website, information sent over the internet can be intercepted or altered by third parties. This site uses an encrypted connection (HTTPS), but e-mail you send us is not end-to-end encrypted, so do not send us sensitive data. Look-alike sites and links can pretend to be ours: our address is waterlisted.com. We never ask for passwords or payment details.
Other websites
We link to official sources, laboratories and other sites so you can check what we say. We do not control those sites and are not responsible for their content or practices.
Links and kits
Some pages may link to mail-in test kits. Those links can be affiliate links, which is stated where they appear. They never change which labs we list or how.
Corrections
If a lab’s details on its state list change, the state agency that publishes the list is the place to correct them. We update from the state lists on a regular schedule. To tell us about an error on this site, or to ask us to correct or remove a listing, use the contact form or write to [email protected]. We answer within one month.
Privacy and changes
How we handle personal data is described in our privacy notice. We may update these terms; the date at the top shows the latest version.