About MyTapWater.us

MyTapWater.us is a free lookup that tells anyone in the United States what is in their drinking water and whether their service line is, or might be, lead. We aggregate the same federal and state data your local utility files with the EPA, then translate it into plain language.

Why this site exists

The EPA's Safe Drinking Water Information System (SDWIS) tracks roughly 156,000 public water systems in the United States, the violations and enforcement actions against them, and the contaminants they have sampled. State Lead Service Line Inventories, mandated by the EPA's Lead and Copper Rule Revisions, list whether the pipe carrying water from the main into your home is lead, galvanized requiring replacement, not lead, or unknown.

All of this is public. None of it is easy to read. Existing tools are out of date, designed for engineers, or limited to specific regions. MyTapWater.us was built so a worried parent can type their ZIP code and get a clear answer in under a minute.

What we do, and what we do not do

We do:

• Pull EPA SDWIS quarterly bulk downloads
• Pull EPA UCMR data on emerging contaminants like PFAS and lithium
• Pull state-published Lead Service Line Inventories where they exist
• Cross-verify a sample of every release against the EPA Envirofacts API before publishing
• Show data with full provenance, last-updated dates, and known limitations

We do not:

• Make medical diagnoses or treatment recommendations
• Generate health claims that are not traceable to a named source
• Use AI to write the educational content that explains contaminants; humans write those, and a clinical reviewer signs off
• Speak for the EPA, your state, or your water utility

Editorial standards

Every contaminant page on MyTapWater.us is reviewed by a clinician before publication. The MyTapWater.us editorial team writes and maintains all hand-authored content. Each page is dated with its last review date, and our corrections policy is documented on the methodology page.

How we make money

MyTapWater.us is free for users and supported by:

1. Display advertising via Google AdSense, disclosed on every page that carries ads
2. Affiliate links to water filters and home water tests, marked as such, where we believe a product genuinely helps for a given contaminant
3. Lead generation for licensed plumbers who replace lead service lines, where the user requests it

Affiliate or advertising relationships never determine which contaminants we cover, how we describe risk, or which water systems we include. The data is the product; the rest pays the bills.

Get in touch

Corrections, press inquiries, or partnerships: hello@mytapwater.us. More on the contact page.