Verified license

Allison-Sierra Inc

Mariposa, CA · Mariposa CountyWell drilling and pump installation

Call (209) 966-4082
Directions
License status
Active
checked September 29, 2026
License number
507261
California record
Services
5
Pump Installation and more
Counties served
3
on the state record

About Allison-Sierra Inc

Allison-Sierra Inc is a well drilling and pump installation contractor based in Mariposa, CA (Mariposa County). The California licensing program lists license 507261 as active, and we last checked the record on September 29, 2026.

The state record covers pump installation, pump repair, well abandonment, well drilling and well repair. It lists 3 counties where the business works, including Merced County, Madera County and Stanislaus County.

This profile is built from public state license records checked on September 29, 2026. Well Water Insider does not rate or endorse contractors. Own this business? Claim the profile to add photos, hours and a description.

License record

Verified against state records
License number
507261
License type
Well drilling and pump installation
Status
Active
Expires
March 31, 2027
Last verified
September 29, 2026

Check this license yourself on the official California lookup.

What the state record says

Holds an active California C-57 Well Drilling contractor license (CSLB license 507261, corporation, first issued 1987, current through 2027-03-31). The C-57 classification covers drilling, casing, cleaning, repairing and destroying water wells and installing and repairing well pumps. Also licensed as: A general engineering, HAZ hazardous substance removal. Filed 14 well completion reports with the Department of Water Resources since 2016 (12 new wells; 2 well destructions), most recently in January 2021, mostly in Merced, Madera and Stanislaus counties.

Services

What the California record says Allison-Sierra Inc is licensed or registered to do.

Pump Installation

Setting a new submersible or jet pump with the pressure tank, switch and controls.

Pump Repair

Tracking down low pressure, short cycling or no water, then repairing or replacing parts of the pump system.

Well Abandonment

Sealing an unused well to state standards so it cannot carry surface water down into the aquifer.

Well Drilling

Drilling a new private well, setting the casing and grouting it the way state rules require.

Well Repair

Fixing casings, caps, pitless adapters and other parts of an existing well.

Service area

Based in Mariposa County, California. The state record lists 3 counties.

Approximate location (Mariposa County)Counties on the state record

  • Merced County
  • Madera County
  • Stanislaus County

Well water in Mariposa County

Useful context before you call a contractor here.

72%of households in Mariposa County drink from a private well (est.)
250 to 600 feet; the median of 1,018 domestic wells reported to DWR since 2000 is 380 feettypical private well depth
Not requiredwater test when a home with a well is sold in California
Open the Mariposa County well guide

Typical costs for these services

National ranges to help you read a quote. They are not prices from Allison-Sierra Inc; ask for a written estimate.

Submersible pump replacement$1,200 to $4,500parts and labor
Pressure tank replacement$400 to $1,200installed
New well drilled$5,500 to $25,000about $25 to $65 per foot
Shock chlorination$80 to $300or about $20 as a DIY job

Before you hire

  1. 1

    Confirm the license

    Look up license 507261 on the California state lookup and make sure it is active for the work you need. Open the California lookup.

  2. 2

    Get a written estimate

    Ask for the scope, parts, depth or pump size, permit fees and warranty in writing. Compare two or three quotes for big jobs.

  3. 3

    Ask about permits and the well log

    New wells and many repairs are reported to the state. Ask who files the paperwork and for a copy of the well log.

  4. 4

    Test the water after the work

    Any work on a well can disturb bacteria. Test for coliform bacteria once the job is done.

Questions about Allison-Sierra Inc

Is Allison-Sierra Inc licensed?

Yes. The California record shows license 507261 (well drilling and pump installation) with the status "active", last checked on September 29, 2026. You can confirm it on the state lookup.

What services does Allison-Sierra Inc offer?

The state record lists pump installation, pump repair, well abandonment, well drilling and well repair. Call to confirm they take on your type of job.

What areas does Allison-Sierra Inc serve?

The business is based in Mariposa County (Mariposa, CA). The state record lists 3 counties, including Merced County, Madera County and Stanislaus County.

How do I contact Allison-Sierra Inc?

Call (209) 966-4082. The address on the state record is 3923 Bootjack Lane, Mariposa, CA 95338.

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