What is TreeCheck?
TreeCheck tells you whether a California address is inside the citrus quarantine, using CDFA's public boundaries.
Independent and unofficial. Built from public CDFA data. Boundaries are approximate and can change any day. Confirm with CDFA: 1-800-491-1899. Not affiliated with CDFA or UC.
Where the data comes from
- CDFA Quarantine Boundaries (public view layer) — Public data published by the California Department of Food and Agriculture
- US Census Bureau cartographic boundary files 2024 (1:500,000) — Public domain (US Government work)
- OpenStreetMap land polygons (osmdata.openstreetmap.de), cut to the California coast — © OpenStreetMap contributors, ODbL 1.0
We check the data every night. Today there are 5 active zones; the newest took effect September 17, 2026.
- San Diego - San Diego — effective February 17, 2023
- San Diego - Ramona — effective March 2, 2026
- Ventura - Santa Paula — effective July 15, 2026
- Imperial - Calexico — effective August 13, 2026
- LA/Orange/San Bernardino/San Diego/Riverside/Oceanside/ValleyCenter/Fallbrook — effective September 17, 2026
How the answer is worked out
- We use CDFA's full-detail geometry, never a simplified copy. An address exactly on the line counts as inside.
- Distance is measured to the inland quarantine line: the coastline and the state or national border don't count as 'the line'.
- Less than 0.1 mile from the line: treat it as inside and call CDFA.
- The date your area entered the quarantine comes from the earlier boundary versions CDFA publishes.
Photo
The home-page photo shows orange groves at California Citrus State Historic Park, Riverside, California (January 2024). Photo by Blervis, dedicated to the public domain (CC0 1.0): source.
TreeCheck is not affiliated with CDFA or UC.