Underground Plumbing Installation Across Hollister and Area

DAE Plumbing trenches and installs new underground water, sewer, and gas lines for homes, builders, and businesses across Hollister and nearby towns, with our own excavation equipment and a licensed, insured crew. Estimates are free.

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Free Estimates, Upfront Pricing

Licensed & Insured, CA Lic. #1047507

Family-Owned & Operated

20+ Years of Experience

Serving Hollister Since 2018

DAE Plumbing installs new underground water, sewer, and gas lines in Hollister and the surrounding five-county area. We operate our own trenching and excavation equipment, handle utility locating and permits, and build every buried line to code with inspection-ready bedding and backfill. Estimates are free for homeowners, builders, and commercial clients.

When You Need Underground Plumbing Installation

Every new building, addition, or major site project needs buried water, sewer, and gas lines trenched and installed before anything vertical happens. You need underground installation when a new home or commercial building is ready for its underground rough-in, or when you are adding an accessory dwelling unit, shop, or barn that needs its own water, sewer, or gas.

Properties connecting to city sewer for the first time need a new lateral trenched across the site. Outdoor projects count too: gas lines to outdoor kitchens, pools, and generators, and water lines to landscaping or livestock.
On slab foundations, the underground plumbing must be installed, tested, and inspected before concrete pours, so early scheduling matters.

If an existing buried line has failed, underground plumbing repair is the service you need.

Need a new water, sewer, or gas line trenched to a new build, shop, or ADU? Tell us about the property and we will scope it properly.

📞 Call (831) 801-1079

Mon-Fri 7am-5pm, weekends by appointment

What the Process Looks Like

Underground work done right follows a strict sequence. We start with utility locating, calling in USA North 811 marks so existing gas, electric, water, and communication lines are identified before any bucket touches soil.

We then plan the trench route and depth to code for the line type, coordinating permits with the local building department. Excavation follows, using our own trenching and excavation equipment, which means we control the schedule instead of waiting on a rental or subcontractor.
New lines are laid on proper bedding, sloped correctly for drainage lines, pressure-tested or leak-tested as the code requires, and inspected before any soil goes back. Backfill is placed and compacted in lifts to prevent the settlement that cracks hardscape and re-breaks pipe.

Finally, we restore the surface as close to original as conditions allow and hand you a documented, inspected installation.

Our Work in Hollister

Precise trenching and underground rough-in pipe placement completed before a foundation pour in the Hollister area.

Underground plumbing installation trenched, laid, and staged for inspection on a residential build.

DAE Plumbing excavation equipment and service trucks staged for a Central Coast underground project.

How It Works

Locate, Plan & Free Estimate

We call in utility locates, assess the route, depth, and surface conditions, and deliver a free itemized estimate covering excavation through restoration.

Trench & Install to Code

Using our own excavation equipment, we trench, lay the line on proper bedding, slope and test it to code, and pass inspection before any backfill.

Backfill, Compact & Restore

We backfill in compacted lifts to prevent settlement, restore the surface, and leave you with a documented, inspected installation built to last.

What Customers Say About DAE Plumbing, Inc.

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Ready to Schedule Your Underground Plumbing Installation?

Serving Hollister and the Central Coast. Licensed, bonded, and insured, and every estimate is free. New customers get $99 off your first service.

📞 Call (831) 801-1079 Request a Free Estimate

How Long It Takes

A new water service or sewer lateral to a home or ADU typically takes one to three days, depending on depth, length, and what sits above the route. Open lawn is fast; mature landscaping and concrete take longer. New construction underground packages for a single-family home run two to four days of site time before the foundation pours. Larger commercial and multi-unit underground scopes are measured in weeks and phased with the project schedule. Weather, soil conditions, inspection scheduling, and utility conflicts are the variables that move timelines, and we communicate them before and during the job.

What It Typically Costs

Underground work is priced by the conditions: line type and material, trench depth and length, soil conditions, what must be removed and restored above the trench, and access for equipment. A short, straight water line across an open lot is the simple end of the spectrum; a deep sewer lateral routed around mature trees and under a driveway is the complex end.

When you request an estimate, expect questions about the property layout, what the new line will serve, your plans if it is a build, and any known utility locations. Estimates are free and itemized, covering excavation, materials, testing, inspection, backfill, and restoration scope, so you know exactly what is included.

Because we own our excavation equipment rather than renting or subcontracting it, our pricing and scheduling stay in our control, and that shows up in the bid.

Licensed, Bonded, and Insured

DAE Plumbing, Inc. holds California contractor licence 1047507 and is bonded and insured, with underground plumbing install and repair listed among our core specialties. Our fleet includes the service trucks, excavators, and skid steers this work demands, equipment you can see on our job sites across the Central Coast. Buried work is the least forgiving plumbing there is, because mistakes get covered with soil, and our crews trench, bed, test, and compact to the standard that passes inspection the first time.

Local Factors in Hollister and Area

Soil and history shape underground work in our region. Expansive clay soils across the Hollister basin and San Benito County swell and shrink seasonally, stressing rigid pipe and making proper bedding and compaction essential to a lasting installation.

Older neighborhoods carry clay sewer laterals with root intrusion from mature street trees, while properties near the coast in Monterey and Santa Cruz Counties add corrosive soil conditions to the mix. Seismic considerations across the region favor flexible modern materials and quality joint work.

Every jurisdiction in our five-county service area enforces its own trench, bedding, and inspection standards, and we work with the building departments in Hollister, San Benito County, and the surrounding counties week in and week out, serving Hollister and surrounding areas.

Related Plumbing Services

DAE Plumbing, Inc. handles every plumbing scope on the Central Coast. Explore our underground plumbing repair, new construction plumbing, commercial plumbing services, see all plumbing services in Hollister, or request a free estimate today.

Common Questions

Who installs underground water and sewer lines in Hollister, CA?

DAE Plumbing, Inc., a licensed and insured contractor headquartered in Hollister, installs new underground water, sewer, and gas lines across San Benito, Santa Clara, Monterey, Santa Cruz, and San Mateo Counties, operating its own trenching and excavation equipment. Estimates are free.

When is underground plumbing installed on a new build?

Underground water, sewer, and gas lines go in after site grading and before the foundation pours. On a slab foundation, the lines must be trenched, laid, pressure-tested, and inspected before concrete, which is why the plumber needs your plans and schedule early.

Do I need a permit to run a gas line to an outdoor kitchen?

Yes. In California, new underground gas piping requires a permit, correct pipe sizing, a pressure test, and inspection before backfill. A licensed plumbing contractor handles the permit, installs the line to code, and coordinates the inspection.

Frequently Asked Questions

Yes. Our fleet includes excavators, skid steers, and service trucks, so trenching happens on our schedule rather than a rental company's. That control shortens timelines and keeps pricing predictable on both installations and emergency repairs.

Yes. Every excavation starts with USA North 811 utility locates so existing gas, electric, water, and communication lines are marked before we dig. It is required by California law and it is basic job safety; we never skip it.

Yes. Accessory dwelling units need their own water, sewer, and often gas service tied into the main house or the street. We plan the trench route, size the lines, pull permits, and install and inspect everything before backfill.

Yes. We trench and install code-compliant underground gas lines for detached shops, outdoor kitchens, pools, generators, and accessory dwelling units, including pressure testing and inspection coordination with the local building department.

Yes. Underground work that requires a permit is tested and inspected before backfill, and we bed and compact in lifts so the trench does not settle. You can also see the new line yourself before it is buried.

Underground Plumbing Installation by Area

Get Your Free Underground Plumbing Installation Estimate in Hollister and Area

Licensed, bonded, and insured (CA Lic. #1047507). Serving Hollister, Gilroy, Morgan Hill, Salinas, San Juan Bautista, Watsonville, Monterey, San Jose, Santa Cruz and surrounding areas.

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