About PurityMap
Who We Are
PurityMap is an independent, data-driven consumer advocacy platform focused on drinking water quality in the United States.
Led by environmental researchers, water quality analysts, and data specialists, PurityMap exists to give households clear and honest insight into what comes out of their taps. We believe people deserve more than regulatory summaries written for compliance they deserve information that is understandable, relevant, and grounded in real data.
Our mission is simple: to make local water quality transparent, actionable, and easy to understand for every household.
To explore local reports, start here: browse water quality by city and state.
What We Do
PurityMap produces hyper-localized water quality reports for cities, towns, and ZIP codes across the United States.
For each location, we analyze publicly available water quality data from federal, state, and municipal sources. We identify the specific contaminants detected in local tap water, compare reported levels against health-based guidelines, and translate complex datasets into plain-language explanations that households can actually use.
When appropriate, PurityMap connects each local water issue to a filtration solution that is certified to address the specific contaminants identified. We do not offer generic advice. Every insight and recommendation is directly tied to local data.
For full transparency on how reports are built, read our Methodology & Data Sources.
Why PurityMap Exists
Most municipal water reports are designed to answer one question: whether water meets legal limits. They rarely address the questions people actually care about.
Households want to know what contaminants are present in their area, whether those contaminants are linked to long-term health concerns, how aging pipes or hard water may affect their home, and what solutions actually work.
PurityMap exists to bridge the gap between “legally safe” and “actually healthy.”
Our Philosophy
PurityMap operates on a simple set of principles. Data always comes first. We do not use fear-based messaging, paid rankings, or manipulated scores. Every report is grounded in transparent sourcing, with citations clearly referenced so users can review original data themselves.
We believe trust is built through clarity and accountability.
Key Public Sources We Reference
PurityMap references public drinking water data and standards from the U.S. Environmental Protection Agency (EPA), Environmental Working Group (EWG), U.S. Geological Survey (USGS), and NSF certification standards.
EPA Safe Drinking Water Act and SDWIS
EWG Tap Water Database
USGS Water Data and Research
NSF Certification Standards
For the full methodology behind our scoring and reporting, see Methodology & Data Sources.
How We Stay Independent
PurityMap may earn commissions when users purchase filtration products through links on our site. These commissions never influence our analysis, scores, health context, or product eligibility.
All data interpretation is completed before any product is considered. If a filtration system does not meet recognized certification standards for a contaminant, it is not recommended, regardless of commission potential.
Independence is a core part of our credibility.
If you spot an issue or want to suggest a data source, contact us here: Contact PurityMap.
Who PurityMap Is For
PurityMap is designed for homeowners and renters concerned about water safety, parents and caregivers, individuals with sensitive skin or health considerations, households dealing with hard water or aging plumbing, and anyone who wants clear answers without technical jargon.
If you want to understand your water without digging through hundreds of pages of regulatory documents, PurityMap is built for you.
Our Long-Term Vision
PurityMap is building the most comprehensive, publicly accessible map of tap water health in the United States extending from cities to ZIP codes and, eventually, to neighborhood-level insights.
Our goal is to help millions of households understand their water, reduce unnecessary exposure, and make informed decisions with confidence.
Ready to see what’s in your water?
Enter your city or ZIP code to view your local water quality report and understand what your household is exposed to.