The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
The text of Minute 333 on EPA’s[2][3][6] site: "The Commissioners met at the Mexican Section offices in Tijuana, Baja California on December 15, 2025 at 11:00 a.m." (PST, UTC-8), and EPA’s release of the same day announces "the signing of a historic new agreement ... called Minute 333".
EPA’s[1][3][6] quarterly updates: "Mexico completed the sediment basin at Matadero Canyon in May 2026, meeting the pre-rainy-season construction goal".
EPA’s[1][2][6] release of 15 December 2025 announcing the signing of Minute 333 and that it "does not obligate any additional U.S. taxpayer funding".
NBC 7 San Diego on the signing, the Tecolote-La Gloria plant, the Matadero Canyon basin and the beach closures in Imperial Beach and Coronado.[1]
Times of San Diego lists the minute’s actions and local officials’ reactions.[1]
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