Terraform Underground | Subsurface Engineering Specialists

Your Subgrade Partner in Compliance

**Terraform Underground** is a California **A-licensed**, fully insured underground utility contractor focused exclusively on fire protection and potable water work.

We handle **everything below grade**—planning, trenching, pipe, testing, and patch-back—so General Contractors and fire sprinkler companies can **stay on schedule and pass inspection on the first visit.**

Safety & Compliance

California A – General Engineering Contractor • License #1144297
Fully insured; permits and inspections coordinated with the AHJ.
Daily JHAs, utility locates, trench safety, traffic control as required.

Who We Serve

Fire Sprinkler Contractors: We'll own the underground so you can focus on profitable interior work.
General Contractors: Seamless integration with site/civil teams and project schedules.
Property Owners & Facilities: Reliable, code-compliant repairs for property managers, facility owners, HOAs, and small municipalities.

Our Core Expertise: Fire & Domestic Water

Underground Fire Lines

Complete fire mains PVC C900/DI
Backflow install & replacements
PIV install & replacement
Valve replacement
FDC installs & replacement
IBR (in building risers) installations
Fire hydrant installs, repair, relocate
Leak repair

Domestic Water

Water main install/repair, service laterals, meter/box sets
Hot tap coordination with the water district
Shutdown scheduling and execution
Pressure reduction and valve replacements
Emergency break repairs

Excavation & Restoration

Potholing/utility daylighting, trenching, bedding, backfill & compaction
Sawcut and patch-back: asphalt or concrete to city/county standards
Temporary cold patch or permanent restoration (per permit requirements)

Testing & Compliance

Chlorination/disinfection, flushing, bacteriological sampling
Hydrostatic pressure tests and certifications
Inspection coordination (AHJ/Water District)
As-built photos and documentation, lien releases

Trade Partnership Services

We specialize in handling all essential underground and site preparation work for **Fire Sprinkler Contractors, Plumbers, Electricians, and Telecom contractors**. This allows you to streamline your projects, reduce on-site complexity, and focus on your core trade expertise.

1. Subcontracting for Fire Sprinkler Companies

Focus: Underground Fire Service Ties & Assemblies.

Underground Fire Main Tie-ins (PVC, DI, Steel).
Fire Service Laterals and Water District Coordination.
Full Backflow Assembly (RPPA, DCVA) Installation & Vault/Enclosure Set.
Post-install hydrostatic testing and documentation.
Full excavation, trenching, and site restoration/patch-back.

2. Subcontracting for Plumbers

Focus: Water, Sewer, Drainage, and Utility Access.

Trenching: Digging, grading, and preparation for new supply lines, waste pipes, and drain fields.
Utility Connections: Excavation for city water and sewer tie-ins.
Stormwater Management: Installation of drainage solutions, culverts, and routing systems.
Backfilling & Compaction: Ensuring proper base and compaction around new underground plumbing.
Site Grading: Preparing the site elevation and slope for drainage before slab pouring or foundation work.

3. Subcontracting for Electricians

Focus: Conduit Paths, Grounding Systems, and Utility Vaults.

Underground Conduit Installation: Trenching and installing rigid or flexible conduits for primary electrical feeds (e.g., service entrances).
Pad & Vault Preparation: Preparing the ground and pouring pads for transformers, switchgear, and utility vaults.
Grounding Grid Excavation: Digging and placement of grounding rods and conductor loops.

4. Services for Telecommunications

Focus: Data, Fiber Optic, Cable, and Communication Infrastructure.

Fiber & Copper Trenching: Installing trenches for mainline fiber optic and communications cables.
Handhole/Manhole Installation: Preparing and setting pre-cast access points for future maintenance and splicing.
Subsurface Placement: Utilizing specialized equipment to minimize trenching for sensitive areas.
Site Restoration: Full cleanup, backfill, and surface restoration after cable placement.
Path Clearing: Removing obstacles and clearing rights-of-way for new communication routes.

Why Partner with Terraform?

Guaranteed First-Time Inspection Success

Meticulous work and clean documentation mean no costly re-inspection delays.
Fast Scheduling & Clear Updates

We provide fast scheduling and clear, proactive progress updates throughout the project lifecycle.
Transparent Partner Billing

Clear, phase-based invoicing protects your budget and margin on recurring underground work.

Our Service Area

Northern & Central California

We provide comprehensive underground services across:

The Greater San Francisco Bay Area
Sacramento Metro Area and Foothills
The Northern Central Valley (San Joaquin, Stanislaus, etc.)

Our 5-Step Project Flow

Our methodical process is designed to minimize risk and accelerate project completion, ensuring every sub-grade element is installed correctly and ready for inspection.

1

Mobilize & Preconstruction

811 tickets, submittals, permits, traffic control, equipment/material staging.

2

Safe Install

Safe excavation, pipe/valves/assemblies, thrust blocks, backfill to lifts.

3

Test & Inspect

Hydro/chlorination, inspection walk-throughs, punchlist completion.

4

Restore Site

Final backfill, compaction, patch-back (asphalt/concrete), site clean-up.

5

Turnover & Close-out

Documentation, as-builts, photos, final close-out packet delivered.

Emergency? Get a Quote Now.

For the fastest estimate, please choose your preferred contact method below:

Immediate Service Request

Please text or email the following information for a **same-day estimate**:

Job Location (Address or Cross-Streets)
Company Name & Your Name
Repair / Installation Photos (3-5 required)
Project Details or Emergency Status

Text or Call:

(925) 595-1270

Email Plans/Photos to:

terraformunderground@gmail.com

Underground Fire & Water Line Specialists