Best well drillers in Colusa County, California
Not a pay-to-play list: these are the 30 drilling companies with wells on record in Colusa County, ranked by wells actually drilled here — 3,365 logged wells in the California Department of Water Resources (DWR) Well Completion Reports database (records as of 2026-08-14). Every number links back to the public record.
Ranked by wells drilled in Colusa County since 2016 (then all-time), from the full DWR 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 Colusa County?
Sullivan Drilling Inc. has drilled the most Colusa County wells in the recent record — 221 since 2016, 246 in the county all-time.
How many well drilling companies work in Colusa County?
30 companies in the DWR record have drilled wells in Colusa County; 24 of them have drilled somewhere in California since 2022. Smaller operators below the record threshold may also serve the area.
How deep is a typical well in Colusa County?
The median drilled depth in Colusa County is 245 ft, based on 3,594 recorded wells. Depths, water levels, and yields are on the Colusa County wells page.
Well depths, static water levels, tested yields, and drilling cost estimates for this county live on the Colusa County wells page.
Free for property owners. We route your request only to licensed drillers who actually file well logs in Colusa County — never sold elsewhere.
Drill in Colusa County?
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Claim your profileFree to claim · built from DWR public well-log records.