# Sell Mineral Rights in Contra Costa County, CA | Berlin > Sell Contra Costa County, CA mineral rights: Brentwood field oil and Rio Vista Delta gas near Brentwood and Antioch. Free valuation, work shown. Source: https://www.berlinroyalties.com/california/contra-costa-county/ Publisher: Berlin Royalties, a veteran-owned oil and gas mineral and royalty buyer in Tulsa, Oklahoma, buying for its own account since 2014. Call or text 918-984-1645. License: free to quote and cite with attribution to Berlin Royalties and a link to the source URL. Where We Buy · California · Contra Costa County ## Sell your Contra Costa County mineral rights. Martinez, Brentwood, Antioch: we buy minerals and royalties throughout Contra Costa County, the Brentwood field and the Delta edge of Rio Vista gas. [Get a Free Valuation](https://www.berlinroyalties.com/free-valuation/) or call or text [918-984-1645](tel:9189841645) 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](https://www.berlinroyalties.com/inherited-mineral-rights/california/). Formations & Plays ## What produces here ### Brentwood field A small oil and gas field east of Brentwood, down to two active Reabold California wells, with Brentwood's subdivisions close by. ### Rio Vista gas, Delta islands 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. ### Los Medanos gas storage 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. Counties ## Communities we see in Contra Costa County title Martinez Brentwood Antioch Pittsburg Oakley Bethel Island Wherever your tract sits in Contra Costa County, we will research it free and value it with the work shown. Nearby ## Other California counties we buy in [Colusa County](https://www.berlinroyalties.com/california/colusa-county/)[Fresno County](https://www.berlinroyalties.com/california/fresno-county/)[Glenn County](https://www.berlinroyalties.com/california/glenn-county/)[Kern County](https://www.berlinroyalties.com/california/kern-county/)[Kings County](https://www.berlinroyalties.com/california/kings-county/)[Los Angeles County](https://www.berlinroyalties.com/california/los-angeles-county/)[Monterey County](https://www.berlinroyalties.com/california/monterey-county/)[Orange County](https://www.berlinroyalties.com/california/orange-county/)[Sacramento County](https://www.berlinroyalties.com/california/sacramento-county/)[San Joaquin County](https://www.berlinroyalties.com/california/san-joaquin-county/)[San Luis Obispo County](https://www.berlinroyalties.com/california/san-luis-obispo-county/)[Santa Barbara County](https://www.berlinroyalties.com/california/santa-barbara-county/)[Solano County](https://www.berlinroyalties.com/california/solano-county/)[Sutter County](https://www.berlinroyalties.com/california/sutter-county/)[Tulare County](https://www.berlinroyalties.com/california/tulare-county/)[Ventura County](https://www.berlinroyalties.com/california/ventura-county/) We buy in every California county, including ones without a page here. See the [full county index](https://www.berlinroyalties.com/counties/), or start with how to [sell California mineral rights](https://www.berlinroyalties.com/california/). ### Inherited California minerals? 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](https://www.berlinroyalties.com/inherited-mineral-rights/california/). [What California mineral rights are worth](https://www.berlinroyalties.com/mineral-rights-value/california/), information only, with this month's activity. [Unclaimed California royalties](https://www.berlinroyalties.com/unclaimed-royalties/california/): where the money goes and how an heir claims it. ### The California mineral owner's guide 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 guide](https://www.berlinroyalties.com/guide/california/) Questions ## Straight answers for Contra Costa County owners What are mineral rights worth in Contra Costa County? Contra Costa County has almost no production left, so value here is about whether your tract is in the Brentwood field under a Reabold lease, on a Delta island inside the Rio Vista field where new wells are proposed, or neither. County averages are meaningless at this scale. We will tell you plainly what it is worth and whether holding beats selling, free. Does SB 1137 affect what my minerals are worth? If your tract is within 3,200 feet of homes, schools or other sensitive receptors, yes. SB 1137 bars new wells and reworks inside that setback, so minerals under or next to a town are worth what the existing wells will pay for the rest of their lives and little more. Minerals in open country are not affected by the setback, which is why two tracts in the same field can be worth very different amounts. We map your tract against the setback zone before we value it, free. My family's royalty checks stopped years ago. Where is the money? If the operator lost track of the owner, the money is treated as abandoned after three years and sent to the State Controller's unclaimed property program, where it waits under the owner's name. Search it under every family spelling, then look at whether the field is still producing; often both the suspense money and the ongoing interest are worth recovering, and we help with both at no charge. What does it cost me to sell? Nothing. Berlin pays all title work, document preparation, and recording costs. The offer you accept is the amount you receive. ## Before you sign anything in Contra Costa County The things owners here most often wish they had read first. All free, none of it gated. - [How mineral rights are valued](https://www.berlinroyalties.com/mineral-rights-value/), including the rule of thumb people quote and why it is usually wrong - [How to sell mineral rights](https://www.berlinroyalties.com/sell-mineral-rights/) and [how to sell oil and gas royalties](https://www.berlinroyalties.com/sell-oil-and-gas-royalties/), with the real process and timeline - [Who buys mineral rights](https://www.berlinroyalties.com/who-buys-mineral-rights/), the five kinds of buyer compared, and [the companies that buy mineral rights](https://www.berlinroyalties.com/mineral-buyers/) and how to check them - [The Pugh clause](https://www.berlinroyalties.com/pugh-clause/), the single most valuable sentence you can negotiate into a lease - [What a farm out is](https://www.berlinroyalties.com/farmout-agreements/), and why your operator suddenly changed - [The rule of capture](https://www.berlinroyalties.com/rule-of-capture/), and why a neighbor's well can legally drain your minerals - [Non-participating royalty interests](https://www.berlinroyalties.com/non-participating-royalty-interest/), if your deed carved one out - [Executive rights](https://www.berlinroyalties.com/executive-rights/), if somebody else signs the lease that binds your minerals - [Surface owner rights](https://www.berlinroyalties.com/surface-owner-rights/), if you own the ground and someone else owns what is under it - [Questions to ask a buyer](https://www.berlinroyalties.com/questions-to-ask/) and [what happens if you want out after signing](https://www.berlinroyalties.com/can-i-back-out-of-a-mineral-rights-sale/) Free Valuation ## Find out what your Contra Costa County minerals are worth. Free, no obligation, and no pressure. We reply within one business day, usually faster. Prefer the phone? Call or text [918-984-1645](tel:9189841645) 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](https://www.berlinroyalties.com/text-your-check/) to [918-984-1645](tel:9189841645) and our [preliminary offer](https://www.berlinroyalties.com/preliminary-offer/) puts a written number in front of you within about two business days. It holds for 7 while you decide. Your Name Phone Number Email Address Where are your minerals located? OklahomaTexasNew MexicoLouisiana ArkansasKansasNorth DakotaMontana WyomingColoradoUtahCalifornia West VirginiaOhioPennsylvaniaKentucky MichiganMississippiAlabamaIllinoisIndianaAlaska Sand/Gravel/AggregateOther / Not sure County (if known) A few optional questions that speed up the valuation Interest type Select an option Minerals and Royalties Working Interest Overriding Royalty Interest An Entity (LLC, Partnership, Trust) Not Sure Are you currently receiving royalty checks? Select an option Yes No I Used To But They Stopped Not Sure Have you received offers for your minerals before? Select an option Yes No What best describes your situation? Select an option I'm ready to sell now I'm exploring my options I'm just curious what they're worth When would you like this done? Select an option This month This quarter No timeline, just researching Anything else? (optional) Get My Free Valuation No cost, no obligation, and we never share your information.