Topic index
Browse by topic
The 12 dimensions zipradar federates. Each topic page explains the source, refresh cadence, and limitations, with links to per-ZIP lookups.
Water quality
Source: EPA SDWIS
Drinking-water violations, lead-copper results, and health alerts per community water system, sourced from EPA SDWIS and refreshed quarterly.
Flood zone
Source: FEMA NFHL
Official FIRM flood-zone classifications by address with base flood elevations, sourced from the FEMA National Flood Hazard Layer and refreshed quarterly.
Wildfire risk
Source: USDA Forest Service
Community-level wildfire hazard potential on a five-step scale, sourced from USDA Forest Service Wildfire Risk to Communities and refreshed annually.
Air quality
Source: EPA AirNow
Current AQI and multi-year averages from the nearest EPA AirNow monitoring station, per US ZIP code.
Crime
Source: FBI UCR
Reported crime per 100,000 residents, normalized across years and agencies, sourced from the FBI Crime Data Explorer.
Schools
Source: NCES Common Core of Data
District boundary, enrollment, student-teacher ratio, and school demographics sourced from the NCES Common Core of Data.
Radon
Source: EPA Radon Zones
County-level radon risk zone (1, 2, or 3) sourced from the EPA Map of Radon Zones, with state-level supplementary testing context.
Lead pipes
Source: EPA LCRR + RTI National Lead Pipe Map
Lead service-line counts reported under the 2024 Lead and Copper Rule Revisions, sourced from EPA LCRR and RTI's national map.
Property tax
Source: County assessors
Millage rates and assessment methodology from county assessor offices, covering the top 50 US metros.
Deed activity
Source: County recorders
Recent deed-transfer counts aggregated to ZIP level, sourced from county recorder offices. Homeowner names are never cached or republished.
Zoning
Source: Municipal planning departments
Residential, commercial, industrial, and mixed-use zoning classifications sourced from municipal planning departments.
Sex offender registry
Source: NSOPW (federal deep-link)
Deep-link to the Department of Justice's National Sex Offender Public Website (NSOPW). zipradar does NOT cache or republish registry records.