Class Code 4831
Vitamin Or Dietary Supplement Mfg
Class Code 4831 covers manufacturers that produce vitamins and dietary supplements — tablets, capsules, powders, liquids and extracts — in California. The WCIRB-approved pure premium for this classification is $5.229 per $100 of payroll, which reflects expected claim costs for manufacturing exposures common to this industry.
What Class Code 4831 Covers
This classification applies to on-site manufacturing of vitamin and dietary supplement products including blending, granulation, encapsulation, tableting, liquid formulation, extraction, drying and final packaging. Activities include weighing and dispensing raw botanicals and chemical ingredients, operating mixers, encapsulators and tablet presses, in-process quality control sampling and testing, clean-in-place (CIP) sanitation, and finished-goods warehousing and shipping. The code covers operations that convert raw ingredients into finished supplement forms (powders, capsules, tablets, liquids), including small‑scale pilot production and full-scale continuous lines. It does not typically apply to retail supplement sales only or purely off-site distribution when no manufacturing processes occur.
Who It Applies To
- Dietary supplement and vitamin manufacturers operating production lines
- Plant operators and technicians on mixing, encapsulating or tableting lines
- Quality control and laboratory analysts performing in-process testing
- Maintenance, sanitation, and utility crews servicing production equipment
- Warehouse and forklift operators handling raw materials and finished goods
Common Job Duties
- Weighing and dispensing raw ingredients and active botanical extracts
- Operating blenders, granulators, encapsulators, tablet presses and fillers
- Sampling and in-process QC testing (microbiological, HPLC, moisture)
- Cleaning and sanitation of equipment (CIP/steam cleaning) and lines
- Maintaining and repairing conveyors, feeders and mechanical systems
- Packaging, labeling and palletizing finished tablets, capsules and powders
Common Injury Risks
Understanding the $5.229 Rate
The pure premium of $5.229 per $100 of payroll represents the WCIRB's estimate of expected claim costs for the classification before insurer expenses and profit. Insurers use this number as a base, then apply experience modification, policy endorsements, state adjustments and company-specific underwriting to set the final premium an employer pays. Payroll mix, loss history, safety programs, and proper classification all materially affect your actual premium.
Cal/OSHA Compliance Requirements
California requirements that commonly apply include the Injury and Illness Prevention Program (IIPP) obligation and Hazard Communication (Title 8, Section 5194) for chemicals and extracts. Respiratory protection (Title 8, Section 5144), training and exposure monitoring are required when dusts or aerosols exceed limits; Process Safety Management (Title 8, Section 5189) can apply for facilities handling large quantities of highly hazardous chemicals. Combustible dust controls, good housekeeping, machine guarding, lockout/tagout and documented employee training are essential under Cal/OSHA General Industry orders.
How Key HR Helps Employers Under Class Code 4831
A PEO like Key HR helps employers in Class 4831 by ensuring accurate worker classification and payroll reporting, implementing tailored safety programs (dust control, respiratory and lockout/tagout), and managing claims and return-to-work plans to control experience modification. We also provide Cal/OSHA‑focused training, access to loss-control specialists, centralized OSHA log and recordkeeping, and negotiated workers' comp administration that can reduce total cost of risk.
Get a QuoteFrequently Asked Questions
Does Class 4831 include packing and labeling only?
If packing and labeling are part of on-site manufacturing operations for vitamins or supplements, they generally fall under 4831. Purely contract packers or businesses that only perform labeling/fulfillment without manufacturing processes may be assigned a different classification — always confirm with your insurer or PEO.
What practical steps reduce workers' comp costs for a supplement plant?
Key actions include controlling dust at source, instituting respiratory and hearing programs, routine preventative maintenance and machine guarding, formalized return-to-work/light-duty plans, targeted employee training and accurate payroll reporting by job function to ensure correct classification.
Which Cal/OSHA trainings are required for this work?
Common required training covers your IIPP, Hazard Communication for chemicals and extracts, respiratory protection when exposures occur, lockout/tagout for equipment maintenance, and confined space entry or forklift certification if those tasks exist in your facility.
Quick Facts
- Class Code
- 4831
- Classification
- Vitamin Or Dietary Supplement Mfg
- Pure Premium Rate
- $5.229 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
Manage Workers' Comp Through a PEO
Key HR provides pay-as-you-go workers' comp for California employers — no large deposits, no audits, better rates.
Get a Quoteor call (800) 922-4133Ready to Simplify Workers' Comp for Class Code 4831?
Key HR provides California employers with pay-as-you-go workers' comp, HR compliance support, and payroll — all through one PEO partnership.