Martinez, Brentwood, Antioch: we buy minerals and royalties throughout Contra Costa County, the Brentwood field and the Delta edge of Rio Vista gas.
Contra Costa County is nearly out of the oil and gas business. The Brentwood field is down to two wells with subdivisions close by, PG&E stores gas in old reservoirs above Bay Point, and the only live prospect is the Delta corner of the Rio Vista field, where the operator proposed a dozen new gas wells in 2026. Minerals under the suburbs are worth what the last wells will pay and not much more, and we will say so.
What produces here. CalGEM's 2023 annual report, the latest county table it has published, put Contra Costa County at 12,640 barrels of oil and 37,009 Mcf of gas for the year. CalGEM's WellSTAR records as of November 2026 show 19 active wells against 620 plugged: Pacific Gas and Electric's 17 wells at the Los Medanos gas storage field and Reabold California's 2 wells in the Brentwood field. In November 2026 CalGEM released a draft environmental study for California Resources' Rio Vista Well Development Project, 83 new natural gas wells across the field, 12 of them in Contra Costa County.
Whatever you own here, producing royalties, non-producing acreage, or an inherited fraction split among family, we will identify it from whatever paperwork you have, value it off the actual wells and activity, and show you the reasoning with the offer. Free, no obligation, and no pressure: if keeping it is the right answer, we will say so. Inherited it? Start with inherited mineral rights in California.
A small oil and gas field east of Brentwood, down to two active Reabold California wells, with Brentwood's subdivisions close by.
The Contra Costa County corner of the Rio Vista field on Bradford Island and the county's Delta edge, where California Resources' 2026 Rio Vista project proposes 12 new gas wells.
PG&E's 15 gas storage wells in the hills between Clyde and Bay Point, storage rather than production, which is why PG&E is the county's largest well operator.
Wherever your tract sits in Contra Costa County, we will research it free and value it with the work shown.
We buy in every California county, including ones without a page here. See the full county index, or start with how to sell California mineral rights.
Whether you need a probate, the affidavit and transfer on death routes, the dormant mineral rules, and where unpaid royalties go: inherited mineral rights in California, what heirs should do.
What California mineral rights are worth, information only, with this month's activity. Unclaimed California royalties: where the money goes and how an heir claims it.
Everything a California owner needs in one place: who owns what under state law, how royalties must be paid and by when, what a buyer can and cannot deduct, the tax treatment of a sale, and the deadlines that quietly cost people their minerals. Free, and no sign-up.
Read the California guideThe things owners here most often wish they had read first. All free, none of it gated.
Free, no obligation, and no pressure. We reply within one business day, usually faster.
Prefer the phone? Call or text 918-984-1645 and you will get Stephen, the owner, not a call center. If we miss you, we text back the same day.
In a hurry? Text a photo of a royalty check stub to 918-984-1645 and our preliminary offer puts a written number in front of you within about two business days. It holds for 7 while you decide.