Key Points

• Washington state’s Department of Labor & Industries has adopted a new rule requiring construction firms that carry out excavation, trenching and shoring work to complete a written work plan before the job begins.
• The rule says the plan must include an appropriate risk analysis before any work that needs a protective system starts.
• The rule was published on April 21 and is due to take effect on June 1.
• Washington L&I says it will provide a written work plan template on its website.
• Employers may also create their own plan, as long as it meets the rule’s criteria.

Washington (Evening Washington News), May 19, 2026, and is set to take effect on June 1, amends existing regulations and requires employers to prepare a written work plan that details an appropriate risk analysis before beginning any task that requires a protective system. According to the information provided, the agency will make a template available on its website, while employers will also have the option of producing their own compliant plan. The change is aimed at formalising planning requirements for higher-risk work in excavation and trenching environments.

What does the new trenching rule require?

The central change is the introduction of a written work plan for excavation, trenching and shoring operations.

Under the new rule, employers must complete the plan before work begins, rather than treating safety planning as an informal or purely verbal process.

The requirement applies specifically where a protective system is needed, which suggests the rule is focused on situations with greater risk to workers.

The rule also specifies that the work plan must contain a risk analysis. That means employers are expected to identify hazards in advance and record how those hazards will be addressed before workers enter the trench or excavation area.

L&I has said the plan can be produced using a template it will publish, or employers can draft their own version if it satisfies the state’s criteria.

Why is the rule being changed?

The available information points to a stronger emphasis on formal preparation before dangerous work begins.

In practical terms, trenching and excavation are recognised as high-risk activities because conditions can change quickly and failures in planning can have serious consequences.

The rule therefore appears designed to require a documented safety process rather than leaving decisions to be made on site without written evidence.

News writing guidance stresses that the most important facts should come first, and in this case the key point is the shift from general compliance expectations to a specific written requirement.

The rule’s language about “detailing appropriate risk analysis” shows that the state wants employers to think through hazards before work starts, not during the job itself.

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How will employers comply?

Employers will have two broad options. They can use the written work plan template that Washington L&I says it will publish on its website, or they can create their own document.

Either way, the plan must meet the rule’s criteria and be completed before work requiring a protective system begins.

For construction firms, that means safety planning will need to be documented and retained in a way that can demonstrate compliance if inspected.

The change may also affect supervisors and site managers, who will likely need to ensure that trenching work does not begin until the written plan is complete.

Based on the rule summary, compliance will depend not just on having a plan, but on having the right kind of plan in writing before the work starts.

What work is covered?

The rule applies to construction firms in Washington state that perform excavation, trenching and shoring work. Those activities often involve unstable ground conditions and the use of protective systems, making advance planning essential.

The new requirement is tied to work that needs a protective system, which narrows the focus to operations where the risk level is high enough to trigger that safeguard.

Because the information provided does not include the full regulatory text, the safest reading is that the rule is aimed at jobs where trench collapse or related hazards could arise.

The core obligation, however, is clear: before work begins, there must be a written plan that explains the risk analysis and the safety approach.

What do the dates mean?

The rule was published on April 21 and is scheduled to come into force on June 1. That gives employers a short window to review their procedures and prepare the required documentation.

In regulatory terms, the publication date matters because it marks when the rule was formally issued, while the effective date marks when compliance becomes mandatory.

For readers following Washington workplace safety changes, the timing is significant because it means the state is moving quickly from adoption to enforcement.

Firms involved in trenching and excavation work will therefore need to act promptly if they have not already reviewed their safety paperwork.

Why does attribution matter here?

The story is based on a regulatory update from Washington state’s Department of Labor & Industries, which is the main source for the requirement.

In news reporting, official sources are especially important when a story concerns a legal or safety rule, because they provide the exact language and effective date. That approach helps reduce the risk of errors in dates, obligations and scope.

The reporting style also follows the inverted pyramid, meaning the most important facts are placed first and the detail follows afterwards.

That structure is especially useful in a breaking regulatory story because readers can quickly understand what changed, who is affected and when the rule takes effect.

Background of the development

Washington state has updated its trenching and excavation requirements by adding a written work plan obligation for employers carrying out excavation, trenching and shoring work.

The change was adopted by the Department of Labor & Industries and is intended to make risk analysis part of the pre-work process rather than an informal step.

According to the information provided, the agency will also offer a template to help employers comply, while still allowing businesses to use their own version if it meets the standard.

Prediction

For construction firms in Washington state, the new rule is likely to increase the amount of paperwork and planning required before trenching or excavation jobs begin. It may also encourage tighter internal safety checks, because employers will need to show a written record of risk analysis before work that requires a protective system starts.

For workers, the practical effect should be clearer job preparation and a stronger emphasis on identifying hazards in advance. For supervisors and compliance teams, the rule may mean reviewing current safety procedures, training staff on the new requirement and building a consistent process for producing written work plans before excavation tasks begin.