The Chemical Map
A mile is a distance, not a danger zone. Every facility files a worst-case release scenario with the EPA and every one of those filings is withheld from the public under 40 CFR Part 1400, so no ring on this map is a modeled plume. The register is also a threshold program: it starts at 10,000 pounds of anhydrous ammonia, California's own program starts at 500, and the state publishes no list of the facilities in between, so absence from this map is not evidence of safety. Homes are the county's 2025 secured roll placed by centroid, so a tower is many parcels on one point, and color is always the distance to the nearest active site of any kind rather than to whatever is filtered. Quantities are the maximum inventory a process is designed to hold, not what is on site today; one Marathon filing reporting 710 million pounds is excluded as a keying error. The accident history is self-reported, unverified and covers a rolling five-year window per filing, which is why the same 109 facilities yield 7 with an accident on their current filing and 24 with one on any submission, and why nothing here is charted over time. No reported accident at a Los Angeles County facility has ever killed anyone. Sources: the Data Liberation Project's FOIA copy of EPA's Risk Management Program database, CC BY-SA 4.0, validated through 3 April 2025, plus two sites from the December 2025 extract, with status checked against EPA's Facility Registry Service; CalEnviroScreen 5.0; Census TIGER 2024.
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