Class Code 6364
Irrigation Pipe Installation
Class Code 6364 covers the installation of irrigation piping systems in California — a hands‑on construction classification that includes trenching, laying and joining PVC/PE/HDPE lines, valve sets and fittings. The approved pure premium rate is $5.085 per $100 of payroll, which helps determine baseline workers' comp cost for crews that perform this work.
What Class Code 6364 Covers
This classification applies to contractors and crews who install irrigation pipe and associated underground components: trench excavation and backfill, laying and joining PVC, polyethylene or HDPE pipe, installing valves, risers, manifolds and valve boxes, connecting to pumps or mainlines, pressure testing and system startup. It covers both new construction and major replacement of buried irrigation piping but does not generally cover routine sprinkler maintenance or landscape mowing (those are different classifications). Work includes mechanical joining (couplings, clamps), solvent welding, heat fusion of polyethylene, compaction of bedding material and surface restoration after backfill. Because it involves excavation and utility interfaces, locating utilities and coordinating with other trades is common under this code.
Who It Applies To
- Irrigation contractors and specialty pipe crews
- Landscape contractors performing new irrigation installations
- Golf course irrigation installation and renovation crews
- Municipal and park irrigation installers
- Nursery and agricultural irrigation installation teams
Common Job Duties
- Marking and locating underground utilities, staking and layout from plans
- Trenching with hand tools or small excavators and shoring/slope work
- Cutting, joining and sealing PVC, PE or HDPE pipe (solvent weld, fusion, couplings)
- Installing valves, valve boxes, manifolds, risers and backflow device connections
- Pressure testing lines, chlorination/disinfection and leak repair
- Backfilling, compaction and site restoration of turf, paving or landscaping
Common Injury Risks
Understanding the $5.085 Rate
The pure premium rate of $5.085 per $100 of payroll is the insurer's estimated cost of future claims for this class before expenses and profit. To estimate pure premium, multiply payroll by (5.085/100) — e.g., $100,000 payroll yields $5,085 in pure premium. Final premiums vary by carrier adjustments, your experience modification, deductible choices, payroll accuracy, and the mix of other class codes on the policy.
Cal/OSHA Compliance Requirements
Irrigation pipe installation work is subject to Cal/OSHA excavation and trenching rules (Title 8, Sections 1540–1546) including the requirement for a competent person, protective systems (sloping, shoring or shielding), ladder access and atmospheric testing where required. Employers must implement an Injury and Illness Prevention Program (Title 8 §3203), the Heat Illness Prevention standard (Title 8 §3395) for outdoor crews, and provide appropriate PPE, traffic control when working near roadways, and utility‑notification (811) procedures before digging.
How Key HR Helps Employers Under Class Code 6364
A PEO like Key HR helps irrigation contractors by ensuring accurate payroll classification, centralized claims handling and return‑to‑work programs that reduce lost time. Key HR can provide job‑specific safety templates, Cal/OSHA‑aligned training (trenching, heat illness, PPE), and pooled buying power on workers' comp to help lower experience mods and overall insurance costs.
Get a QuoteFrequently Asked Questions
How do I know if my crew should be coded to 6364 or a different class?
Use 6364 when the primary activity is installing irrigation piping and associated underground components (trenching, laying, joining, valve installation). Routine maintenance, sprinkler head replacement or landscape mowing are different classifications—document job duties and time spent on installation versus maintenance to ensure correct coding.
What practical steps reduce workers' comp costs for irrigation pipe crews?
Implement a competent‑person trenching program, formal IIPP, heat‑illness prevention, equipment safety checks, return‑to‑work policies and toolbox training on pipe handling and joining techniques. Accurate payroll reporting and prompt claims reporting also help lower experience mods and premium.
What Cal/OSHA trainings should my irrigation installers receive?
Provide certified competent‑person training for excavation supervisors, trenching safety for crew leads, heat illness prevention for all field staff, and task‑based training on safe operation of excavation equipment, lockout/tagout for pump work, and proper use of PPE and chemical handling for solvents or chlorination.
Quick Facts
- Class Code
- 6364
- Classification
- Irrigation Pipe Installation
- Pure Premium Rate
- $5.085 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
Manage Workers' Comp Through a PEO
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