About the data

Name: Drinking water compliance, lead, PFAS and radon zone by U.S. ZIP code
Creator: Digital Dynamics Kft.
License: https://creativecommons.org/licenses/by/4.0/

Home Hazard Map turns public EPA records into one report per ZIP code. Nothing is estimated by hand; every value can be traced to the source below.

Which water system serves a ZIP code

We place each ZIP code at its Census ZCTA center point and find the community water system service areas that contain it (EPA’s national service-area dataset: about 60% supplied by states and utilities, 40% modeled by EPA). If several overlap, the system that sells directly to residents and serves the most people is shown first. If none contains the point, we use the ZIP codes the state reports for each system in EPA’s SDWIS and the UCMR 5 ZIP list. If neither exists, the ZIP is shown as likely served by private wells.

Violations

Health-based violations (maximum contaminant level and treatment-technique violations) since 2016, counted once per violation, from EPA’s Safe Drinking Water Information System via the ECHO bulk download of 2026-10-13. States report with a delay of up to several quarters.

Lead

The 90th-percentile lead (PB90) and copper (CU90) results each system reported under the Lead and Copper Rule, from the same SDWIS download.

PFAS

EPA’s Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) results, 2023–2025: the highest value per compound, the number of samples, and how many had a detection.

Natural hazards

FEMA National Risk Index (December 2025), census-tract level: the ratings for 18 natural hazards, overall risk, social vulnerability and community resilience. Each ZIP code takes the census tract covering most of its land (Census ZCTA–tract relationship, 2020); PO-box ZIP codes take their county’s rating. Public domain (FEMA).

Superfund sites

EPA Superfund National Priorities List with site status (final, proposed, deleted) and EPA site-profile links; distances are straight-line from the ZIP center. Public domain (EPA).

Live weather alerts

Loaded by your browser directly from the National Weather Service (api.weather.gov) for the ZIP center; not a warning service.

Radon

EPA Map of Radon Zones (county list). Each ZIP code is assigned the county containing most of its land area (Census ZCTA–county relationship file, 2020).

Download

zip-hazards.csv — one row per ZIP code. Free to reuse under CC BY 4.0; credit “homehazardmap.com” and EPA.

How to cite

Home Hazard Map (homehazardmap.com), 2026. Data: U.S. EPA SDWIS/ECHO (2026-10-13), EPA UCMR 5, EPA Map of Radon Zones, EPA community water system service areas, U.S. Census Bureau.

Who built this

Home Hazard Map is designed, built and run by Digital Dynamics Kft., a small European software studio (Hungary, EU). We wrote the data pipelines, the map engine and the site, and we host them on our own servers in the European Union. We also run Tornado Live Map, Earthquake Live Map, Planting Zone Map and Home Hazard Map.

The same team builds custom software for businesses: online shops and websites, SaaS products, ERP and back-office systems, mobile apps for Android and iPhone, and data collection, automation and map-based dashboards — or anything else that can be programmed. Projects are delivered turnkey, with a 12-month bug-fix warranty and EU GDPR compliance.

See our work at digitaldynamics.hu → or write to info@digitaldynamics.hu

Corrections to the data: info@digitaldynamics.hu. Fonts: Space Grotesk and IBM Plex Sans (SIL Open Font License).

What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.