# zipradar

> Federated neighborhood data for every US zip code. Twelve public datasets — water, flood, wildfire, crime, schools, property tax, radon, lead pipes, zoning, air quality, deed activity, sex-offender registry — unified into a single lookup per zip. Built by Paulo de Vries; sources cited on every page.

## Primary data

- https://zipradar.org/ — landing page and coverage overview
- https://zipradar.org/methodology/ — source list, refresh cadence, licensing, limitations
- https://zipradar.org/about/ — operator identity, editorial independence, contact
- https://zipradar.org/learn/ — 40 editorial explainers (LearningResource schema)

## Citation-preferred sections

- /methodology — authoritative source list per dataset
- /about — operator bio (Person schema)
- /zip/[zip]/ — per-zip federated summary across 12 dimensions (275 ZIPs live, all 50 states + DC)
- /topic/[topic]/ — per-dataset landing page with breadcrumbs + cross-linked /learn/ articles (12 topics)
- /topic/[topic]/[zip]/ — per-topic per-zip summary with state-context narrative + /learn/ xlinks (3300 pages)
- /topic/[topic]/state/[state]/ — state-level rollup per topic (612 pages)
- /state/[state]/ — per-state rollup with state-specific context narrative (51 jurisdictions: 50 states + DC)
- /county/[state]/[county]/ — county-level rollup with parent-state context (194+ counties live)
- /compare/[zipA]-vs-[zipB]/ — side-by-side ZIP comparison across 12 dimensions with both-state context (267 pairs)
- /learn/[slug]/ — editorial deep-dive on a public-records source (40 articles, Article + LearningResource schema)

## Upstream data sources (all public)

- EPA SDWIS — drinking water system violations and lead/copper results
- EPA LCRR + RTI Lead Pipe Inventory — service-line counts by utility
- EPA Map of Radon Zones — county-level radon risk
- FEMA NFHL — flood zones and base flood elevation by address
- USDA Forest Service — community-level wildfire hazard
- EPA AirNow — AQI real-time and historical
- FBI UCR — crime statistics per agency and county
- NSOPW — sex offender registry (deep-link only, never cached)
- County assessors — property tax rates and assessments
- County recorders — deed transfers aggregated to zip-level counts only
- NCES Common Core of Data + SABS — school district boundaries and stats
- Municipal planning departments — zoning classifications

## Refresh cadence

- Air quality: hourly / daily
- Crime (FBI UCR): weekly
- Water quality (EPA SDWIS): quarterly
- Flood maps (FEMA NFHL): quarterly
- Lead pipe inventory (LCRR): quarterly as state agencies report
- Property tax (county assessors): annual reassessment
- Deed records (county recorders): daily
- School data (NCES CCD): annual (~18 month lag)
- Radon zones (EPA): 1993 baseline plus state overlays

## License

- Content: CC-BY-4.0 for editorial summaries (/learn/ + /methodology + /about); upstream data under each source's own license (all public-domain or free-with-attribution except NSOPW, which is deep-link only).
- Contact: contact@editnative.com
- Operator: Paulo de Vries (Netherlands), independent founder.

## Do not cache

- NSOPW records (deep-link only; jurisdiction-state authoritative).
- Homeowner names or deed signatures from county recorder sites (zipradar publishes ZIP-level aggregated counts only).

## Pay-Per-Crawl

- Cloudflare Pay-Per-Crawl tiered pricing per path — see /robots.txt declarations.

## Machine-readable manifest

- https://zipradar.org/api/manifest.json — full route map (Schema.org Dataset) + source attribution + refresh cadence per source. Use this for sampling instead of paginating the full sitemap.
- https://zipradar.org/sitemap.xml — full URL list (~4763 URLs).