A Chemical Hygiene Plan (CHP) is the single legal document that makes chemical safety enforceable in a U.S. laboratory. Under OSHA’s Laboratory Standard, 29 CFR 1910.1450, any employer where hazardous chemicals are used on a laboratory (non-production) basis must develop, implement, and maintain a written CHP — not just adopt a generic safety manual, but produce a plan specific to that facility’s actual chemicals, procedures, and controls. This guide walks through the process of actually writing one: what has to be in it, how to organize the drafting work, and how to keep it current once it exists. For a definition of the CHP itself and how it relates to other lab safety programs, see CASRAI’s Chemical Hygiene Plan dictionary entry; this guide picks up where that leaves off, at the level of “how do we actually produce and maintain this document.”
Who Has to Write One
The Laboratory Standard applies specifically to laboratory-scale use of hazardous chemicals — work where chemical manipulations are carried out on a scale that can be easily and safely handled by one person, multiple chemical procedures or substances are used, and the procedures involved are not part of a production process. That covers the overwhelming majority of academic, government, and industrial R&D labs. It does not replace OSHA’s general Hazard Communication Standard (29 CFR 1910.1200), which still governs labeling and Safety Data Sheets; the CHP is the additional, laboratory-specific layer on top of HazCom. It is also distinct from a biosafety program governing biological agents — see Biosafety Level (BSL) — since the Laboratory Standard covers chemical exposure, not biological containment. A single institution will typically maintain one institutional CHP with department- or lab-specific appendices, rather than a fully separate plan per room, but every distinct laboratory operation needs to be represented in it.
Step 1: Assign a Chemical Hygiene Officer and Define Authority
29 CFR 1910.1450 requires the employer to designate a Chemical Hygiene Officer (CHO) — a qualified individual with the training and authority to develop and implement the CHP. Before drafting a word of the plan itself, name this person (or role) and write down, explicitly, what authority they have: can they halt work that violates the plan, require corrective action, sign off on new hazardous-chemical purchases, or approve exceptions? A CHP that names a CHO but gives them no real authority over lab practice is a common gap OSHA inspectors flag. In a multi-department institution, most CHPs also designate a hierarchy: an institutional CHO or EHS office holding overall responsibility, with departmental safety coordinators or principal investigators responsible for day-to-day compliance in their own labs.
Step 2: Inventory Your Chemicals and Determine Hazards
You cannot write meaningful procedures for chemicals you haven’t identified. The drafting process starts with a real chemical inventory — every hazardous chemical present in each lab covered by the plan, cross-referenced to its Safety Data Sheet. From that inventory, the plan needs to identify which substances require special handling, in particular the OSHA-defined category of “particularly hazardous substances”: select carcinogens, reproductive toxins, and substances with a high degree of acute toxicity. This inventory step is also where you decide which chemicals require additional provisions under Step 5 below, and it’s the step institutions most often let go stale — an inventory that hasn’t been reconciled against actual lab contents in years is a real and common audit finding.
Step 3: Write Standard Operating Procedures
The CHP must specify standard operating procedures (SOPs) for the safe handling of hazardous chemicals relevant to the lab’s actual work — not a generic restatement of GHS pictogram meanings, but procedure-level detail: how a specific class of reagent is measured, transferred, stored, and disposed of in that lab. Well-run CHPs typically organize SOPs two ways: chemical-specific SOPs for substances used routinely or requiring special handling (e.g., a particular pyrophoric reagent), and process-specific SOPs for recurring lab activities (e.g., solvent extraction, acid digestion) that apply across many chemicals with similar hazard profiles. Referencing existing protocol documentation rather than duplicating it keeps the plan from becoming unmanageably long — the CHP can point to a lab’s written protocols as its SOPs, provided those protocols actually address the chemical-hygiene elements the standard requires.
Step 4: Define Engineering Controls, PPE Criteria, and Facility Requirements
The plan must set out the criteria the lab uses for selecting and using engineering controls (fume hoods, biosafety cabinets, local exhaust ventilation), administrative controls, and personal protective equipment. This section should state, concretely, what triggers a fume-hood requirement versus general room ventilation, what PPE is the baseline for the lab versus what’s required for specific higher-hazard tasks, and how often controls like fume hoods are inspected or certified. It’s also the natural place to cross-reference the institution’s broader hazard-communication content, such as CASRAI’s guide to reading GHS container labels, since PPE and control decisions are driven directly by the hazard classification on those labels.
Step 5: Add Provisions for Particularly Hazardous Substances
Beyond the general SOPs in Step 3, the standard specifically requires additional protective measures for work with particularly hazardous substances — designated area requirements, access controls, decontamination procedures, and, where applicable, procedures for the safe removal of contaminated waste. This is one of the sections OSHA compliance officers scrutinize most closely, because it’s also one of the sections most commonly left generic or copied wholesale from a template without being adapted to the institution’s actual carcinogen, reproductive-toxin, and high-acute-toxicity inventory from Step 2.
Step 6: Set Prior-Approval Requirements and Emergency Procedures
The plan must identify the circumstances requiring prior approval from the supervisor or Chemical Hygiene Officer before a particular lab operation may proceed — typically triggered by particularly hazardous substances, novel procedures, or scale-up beyond routine use. Pair this with clear emergency procedures: spill response, exposure/first-aid steps, evacuation, and who to notify. These procedures should be consistent with, but need not duplicate in full, the institution’s broader emergency response plan — the CHP can reference that plan directly rather than re-writing it.
Step 7: Build the Training and Information Program
Employees must be informed of the hazards of the chemicals in their work area and trained on the CHP’s provisions before they begin work involving hazardous chemicals, with refresher training as the plan or hazards change. Institutions frequently combine this training with broader research-conduct onboarding — see CASRAI’s guide to Responsible Conduct of Research (RCR) training for how chemical-hygiene training typically fits into a lab’s overall onboarding sequence. Keep a training record: who was trained, on what version of the plan, and when — this is one of the first things an OSHA inspector or internal auditor asks to see.
Step 8: Set Exposure Monitoring and Medical Consultation Triggers
The plan needs criteria for when exposure monitoring is required — generally, whenever there is reason to believe exposure levels for a substance with an established OSHA Permissible Exposure Limit (PEL) routinely exceed the PEL or an applicable action level. It must also describe how employees get access to medical consultation and examination, including circumstances that automatically trigger a medical evaluation (a known or suspected overexposure, signs or symptoms of exposure, or a spill/leak/explosion resulting in a likelihood of hazardous exposure).
Maintaining the Plan: The Annual Review Requirement
Writing the CHP is not a one-time project. 29 CFR 1910.1450 requires the plan to be reviewed and updated as necessary at least annually, and it must be readily accessible to employees at all times. In practice, “as necessary” means the plan should be revisited whenever the institution adds a new hazard class to its chemical inventory, changes a control or PPE requirement, restructures the CHO/safety-coordinator reporting line, or after an incident reveals a gap. A CHP with a review date more than a year old, or one that doesn’t reflect the lab’s current chemical inventory, is one of the most common findings in an OSHA laboratory inspection or an institutional EHS audit.
Where to Start: OSHA’s Non-Mandatory Guidance
OSHA does not publish a single official CHP template, but Appendix A to 29 CFR 1910.1450 — the National Research Council’s recommendations, drawn from the NRC’s Prudent Practices in the Laboratory: Handling and Management of Chemical Hazards — provides non-mandatory guidance on developing a plan, and is the closest thing to an official starting framework. It is explicitly advisory: following it is not itself compliance, and deviating from it is not itself a violation, but it maps closely onto the elements OSHA actually expects a CHP to address. Most institutions also draw on their own EHS office’s existing plan as the starting template when a new department or satellite lab needs to be brought under the institutional CHP, then adapt the chemical-specific and process-specific sections for that lab’s actual work.
Frequently Asked Questions
What is a Chemical Hygiene Plan?
A Chemical Hygiene Plan is the written, facility-specific program required under OSHA’s Laboratory Standard (29 CFR 1910.1450) that sets out the procedures, controls, PPE criteria, training, and monitoring provisions needed to protect lab employees from hazardous-chemical exposure. See CASRAI’s full definition for more detail on scope and how it differs from related programs.
Does OSHA provide a Chemical Hygiene Plan template?
Not an official mandatory one. Appendix A to 1910.1450 offers non-mandatory National Research Council guidance that many institutions use as a starting framework, and most universities and research institutions publish their own institutional CHP templates through their EHS offices that satellite labs and departments adapt.
How often must a Chemical Hygiene Plan be reviewed?
At least annually, and updated as necessary whenever the lab’s chemicals, processes, equipment, or controls change materially. The plan must also stay readily accessible to employees at all times, not just be reviewed on schedule.
Who is responsible for writing and maintaining the Chemical Hygiene Plan?
The employer is legally responsible, but 29 CFR 1910.1450 requires designating a Chemical Hygiene Officer with the training and authority to develop and implement the plan. In practice, the CHO or an institutional EHS office typically drafts and maintains the plan, with input from departmental safety coordinators and principal investigators on lab-specific SOPs.
Is a Chemical Hygiene Plan the same as a Hazard Communication (HazCom) program?
No. The Hazard Communication Standard (29 CFR 1910.1200) governs container labeling and Safety Data Sheets across all covered workplaces. The Laboratory Standard’s Chemical Hygiene Plan is an additional, laboratory-specific requirement layered on top of HazCom, covering SOPs, engineering controls, particularly hazardous substances, training, and medical consultation triggers that HazCom alone does not address.
