{"name":"Costa Loma Drilling Activity in San Mateo County, California","publisher":"Buckhead Energy","url":"https://www.buckheadenergy.com/operators/costa-loma/california/san-mateo","license":"https://creativecommons.org/licenses/by/4.0/","dataAsOf":"2026-08-06","source":"Public state oil & gas well-header records (permits, spuds, completions).","operator":"Costa Loma","operatorSlug":"costa-loma","state":"CA","county":"San Mateo","totalWells":22,"producingWells":8,"permits24mo":10,"spuds24mo":0,"ducCount":2,"topFormation":null,"rankInCounty":1,"firstPermitDate":"1955-08-27","lastPermitDate":"2026-06-08"}