How much does it cost to drill a well in California’s Central Valley?

Published figures put a new domestic well in the Central Valley at about $20,000 to $35,000. Deep wells and long runs to the house cost more. That range comes from a 2021 write-up on a San Joaquin Valley well replacement program. Location, soil and driller availability moved the price.

A national cost guide prices residential drilling at $25 to $65 per foot. State well records show new valley wells mostly finishing 300 to 500 feet deep. Before the trench and lines, national guide rates at valley depths put a well at about $12,800 to $34,500. Those are market numbers, not our price list.

Depth drives the total most. Casing, the county’s seal depth, the pump and tank, the trench and electrical run, and the permit add the rest. Our free estimate for a new water well spells out the depth range, casing, seal, pump and tank. The depth range comes from the well records nearby.

What does well drilling cost per foot in California?

A national cost guide updated in June 2026 puts residential drilling at $25 to $65 per foot. It says $25 to $35 per foot covers most jobs. A 2023 home-improvement cost guide lists California at $25 to $50 per foot. Those drilling rates leave out the casing, the pump and the tank.

The national average of about $5,500 you may have seen fits a shallow well. In the same guide’s depth table, a 150-foot well with 4-inch PVC casing comes to $5,325. New valley wells run two to three times that deep.

How deep will a new well be in the Central Valley?

Deeper than it used to be. Drillers file a completion report with the state for every well, and the Department of Water Resources publishes them.

For new domestic wells finished since 2020, the middle half ran 300 to 400 feet deep around Fresno. Around Hanford it was 360 to 450 feet, and around Riverdale 400 to 500 feet. Madera-area wells ran 550 to 600 feet.

Wells from 1990 to 2009 in the same records had median depths near 180 feet around Fresno. The medians were near 205 feet around Hanford and 245 feet around Riverdale. Cost guides call depth the biggest line item on a well, so that shift shows up in the price.

No driller can promise what the ground holds. The depth range on an estimate should come from the logs of nearby wells. You can search reports near your address on the state’s online well completion report map.

How much would it cost to dig a 300 ft well?

At national guide rates, drilling and casing a 300-foot well runs $10,650 to $18,360. The low end uses 4-inch PVC casing and the high end 6-inch steel. Add a pump, a pressure tank and switch, and Fresno County’s $918 permit. The total comes to about $12,800 to $22,300 before the trench and lines.

Around most valley towns, 300 feet is now the shallow end for a new domestic well. The table runs the same math at the depths the records show.

The drilling and casing figures come from a national guide’s depth table. The 500-foot row carries the same per-foot rates one step deeper. The trench and lines come on top.

What else drives the price besides depth?

Casing. In that table, a 6-inch steel-cased well costs about 70 percent more than a 4-inch PVC well. Settle the diameter and the material on the estimate.

The seal. The annular seal fills the gap between the casing and the hole, keeping poor-quality water out. The state well standard, Bulletin 74, sets a 20-foot minimum for domestic wells. Counties can require more, and Fresno County uses the 20-foot minimum. Ask for the rule on your parcel.

The pump and tank. Larger pumps set deeper cost more, and that adds up on a 400-foot well. Sizing and setting the submersible pump should be its own line on the quote. Our guide to what a well pump replacement costs breaks those numbers down.

The trench and electrical run. The farther the well sits from the house, the more trench, pipe and wire the job needs. For a well out in a field, the trench and water line can be a big part of the bill.

The permit. Fresno County’s $918 fee sits well above the national guide range. The county issues well permits to licensed well drilling contractors, so the driller applies. It says domestic well permits are usually processed normally, while the groundwater agency regulates how the water is used.

Driller demand. Prices climb when drillers are scarce. In late 2015, during a drought, a valley nonprofit reported the average new domestic well had passed $25,000.

How long does it take to drill a 200 ft water well?

National cost guides say drilling a residential well generally takes one to three days. One guide’s residential category covers wells of 100 to 200 feet, so a 200-foot well fits. Setting the pump, running the lines and testing bring most jobs to about a week. Extra depth, rocky ground and permit delays can stretch that.

Paperwork comes before the rig. In Fresno County, drilling may not start until the driller holds a valid permit, which lasts 180 days. The county asks for 48 hours’ notice before the seal goes in, so staff can inspect it.

Is it illegal to drill your own well in California?

Yes. Water Code section 13750.5 bars anyone from drilling a water well unless the person responsible holds a C-57 license. The same rule covers deepening or destroying a well. The section lists no exemption for homeowners.

Counties draw the same line. Fresno County’s well program says only people with an active C-57 license may build, rebuild or destroy wells. State law also has the driller file a completion report on every new well with the Department of Water Resources.

How do you get a price for your own property?

Every figure above is a market number from cost guides and public records. Your total depends on your depth, casing, seal, pump, tank, trench and permit.

Big River Drilling is a licensed C-57 well drilling contractor based in Riverdale. We drill new domestic wells by mud rotary, set the pump and tank and run the lines to the house. Start with water well drilling in Riverdale, or call or text (559) 867-3806 for a free on-site estimate.