Washington Plumber Insurance Requirements — Bonds, Liability, and EBIPS

Getting your individual plumber certification in Washington involves no insurance — it is purely a competency credential. But the moment you register as a plumbing contractor, L&I requires three financial protections before they will activate your license: a surety bond, general liability insurance, and workers' compensation if you have employees.

The $6,000 Plumbing Contractor Surety Bond

Under RCW 18.106, every plumbing contractor must post a continuous $6,000 surety bond. This bond is separate from the general contractor bond required under Chapter 18.27 RCW ($30,000 for general contractors, $15,000 for specialty contractors). If you hold both a general contractor registration and a plumbing contractor registration, you carry two separate bonds.

The bond must be issued by a licensed surety company and must specifically reference the plumbing contractor license. Generic construction bonds do not satisfy the plumbing requirement. The bonding agent signs and physically seals the document before it goes to L&I.

General Liability Insurance

L&I requires a minimum of $250,000 combined single limit, or split limits of $200,000 public liability and $50,000 property damage. The insurance provider must submit proof of coverage electronically through EBIPS.

EBIPS — The Electronic Bond and Insurance Policy System

This is where the process has changed significantly. L&I now requires insurance companies and bonding agents to electronically submit proof of coverage through the EBIPS portal. Paper copies mailed, hand-delivered, or emailed directly to L&I are no longer accepted for registration renewals. The only exception is first-time applicants, who can still submit physical documents with their initial application.

The practical impact: if your insurance agent is not registered in EBIPS, your contractor renewal will stall regardless of whether you have active coverage. Before selecting an insurance provider, confirm they submit through EBIPS. If your current provider does not, switching to one that does is faster than waiting for their EBIPS enrollment.

EBIPS also eliminates the old paper-processing grace period. Under the previous system, a contractor whose bond or insurance lapsed could sometimes continue operating during the weeks L&I took to process paper cancellation notices. Now, any lapse in electronic verification triggers an immediate, automated suspension of the contractor's license.

Workers' Compensation

If you have employees — including plumbing trainees — you must establish an industrial insurance (workers' comp) account directly with L&I. Washington is a monopolistic state fund for workers' compensation, meaning you cannot purchase a private policy; all coverage goes through L&I's State Fund. Sole proprietors with no employees must still register their business with L&I, but may opt out of personal premium coverage by filing an elective coverage rejection form.

Putting It All Together

The order matters: secure the bond and insurance first, because L&I will not process your contractor registration application (Form F627-051-000) without them. The $148.10 contractor licensing fee is on top of these costs.

For a detailed walkthrough of the bond application, insurance thresholds, and EBIPS verification steps, the Washington Plumber License Guide covers each requirement with the specific forms and portal links.

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