Terraform Underground Logo

Underground Fire & Water Line Specialists

We provide **emergency response** for critical underground infrastructure—broken fire mains, PIVs, backflows, hydrants, and water line leaks. Delivered **fast, code-compliant, and inspection-ready** to keep your site safe.

Request a Quick Estimate

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 specialize in complex repairs like **broken PIV valves**, **fire main burst repair**, and **backflow hit by car** incidents.

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 (NFPA 24 compliant)
  • Backflow install & replacements
  • PIV install & replacement (sheared PIV valve repair)
  • Valve replacement (OS&Y, tamper valve repair)
  • FDC installs & replacement
  • IBR (in building risers) installations
  • Fire hydrant installs, repair, relocate
  • Leak repair (fire main leak locate and repair)

Domestic Water

  • Water main/service lateral installs & trenching.
  • Meter and box set upgrades/relocations.
  • Potable backflow (RPPA/DCV) installation.
  • Hot tap, tie-in, and shutdown management.
  • Pressure regulation (PRV) repair and replacement.
  • Emergency break and leak repair services.
  • Water vault installation and repair.
  • Pipe locating and marking services.

Excavation & Restoration

  • Utility daylighting (potholing) and site safety.
  • Precision trenching and pipe bedding.
  • Backfill, compaction, and lift verification.
  • Sawcut services (asphalt and concrete).
  • Full restoration and patch-back.
  • Trenchless boring and drilling.
  • Spoils haul-off and site cleanup.
  • Traffic control plans and flagging.

Testing & Compliance

  • Hydrostatic pressure testing (fire mains).
  • Leak testing and certification reports.
  • Potable water chlorination & flushing.
  • Bacteriological sampling and analysis.
  • AHJ inspection scheduling/walk-throughs.
  • As-built photos and documentation.
  • Final close-out packet & permit closure.
  • Required lien releases and warranties.

Trade Partnership Services

We specialize in handling all essential underground and site preparation work for **Fire Sprinkler Contractors** (NFPA 24 compliant underground), **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.

  • Excavation and trenching for all supply and waste lines.
  • Municipal tie-ins (city water and sewer connections).
  • Stormwater and subsurface drainage solutions.
  • Site grading for drainage and foundation preparation.
  • Backfilling and compaction around new underground plumbing.

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 optic and copper mainline trenching.
  • Handhole and pre-cast manhole installation.
  • Horizontal boring and subsurface cable placement.
  • Full site restoration and asphalt/concrete patch-back.
  • Rights-of-way clearing for new communication routes.

Why Partner with Terraform?

  • Built for 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 and valve installation, critical 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.

Quote Request: Emergency Repairs & Planned Projects

When you need an **Underground Contractor ASAP** or planning a new install, text or email us for the fastest response and quick estimate:

Immediate Service Request

Please text or email the following information for a **quick estimate**:

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

Text plans/photos or Call:

(925) 595-1270

Email Plans/Photos to:

terraformunderground@gmail.com