Best well drillers in Petroleum County, Montana
Not a pay-to-play list: these are the 41 drilling companies with wells on record in Petroleum County, ranked by wells actually drilled here — 362 logged wells in Montana Bureau of Mines and Geology Ground Water Information Center (GWIC) (records as of 2026-07-27). Every number links back to the public record.
Ranked by wells drilled in Petroleum County since 2016 (then all-time), from the full GWIC record. A ★ marks a featured sponsor — sponsors must appear in the county record to be listed, and the ranking below them is never reordered.
Who drills the most wells in Petroleum County?
Central Drilling Inc. has drilled the most Petroleum County wells in the recent record — 11 since 2016, 19 in the county all-time.
How many well drilling companies work in Petroleum County?
41 companies in the GWIC record have drilled wells in Petroleum County; 21 of them have drilled somewhere in Montana since 2022. Smaller operators below the record threshold may also serve the area.
How deep is a typical well in Petroleum County?
The median drilled depth in Petroleum County is 160 ft, based on 777 recorded wells. Depths, water levels, and yields are on the Petroleum County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on the Petroleum County wells page.
Free for property owners. We route your request only to licensed drillers who actually file well logs in Petroleum County — never sold elsewhere.
Drill in Petroleum County?
If your company is on this list, your profile is free to claim — confirm your details and add your contact information so Petroleum County property owners reach you directly.
Claim your profileFree to claim · built from GWIC public well-log records.