Washington Tightens Boat Paint Rules to Safeguard Marine Life

Washington State has implemented groundbreaking regulations to preserve its pristine marine environments by restricting harmful antifouling paints used on recreational vessels. The rules target toxic chemicals that threaten aquatic life while promoting eco-friendly alternatives.

Enacted in 2011, Washington's Antifouling Paint Act represents a comprehensive approach to reducing water pollution from vessel coatings. Traditional antifouling paints containing copper and other biocides prevent marine growth on hulls but release toxins that accumulate in waterways.

Research reveals these chemicals impair fish nervous systems, disrupt reproduction, and cause long-term ecological damage. Copper, while naturally occurring, becomes hazardous at elevated concentrations. The state has now banned Irgarol (cybutryne) entirely for recreational boats since January 2023, following studies showing greater toxicity than previously understood.

Initial legislation focused on phasing out copper-based paints, but subsequent scientific review prompted reconsideration. The Washington State Department of Ecology discovered some copper-free alternatives posed equal or greater environmental risks. This led to postponing the copper phase-out while developing more rigorous safety standards.

A 2023 legislative report established hazard-based criteria for evaluating antifouling chemicals, identifying only Sea-Nine as potentially safer than copper, though data gaps remain regarding its effectiveness.

Current research shows limited progress in developing non-toxic antifouling solutions. Non-biocidal approaches like ultrasonic cleaning systems, hull liners, and specialized docking facilities show promise but require further development and testing.

Scientific modeling conducted by state researchers confirmed Irgarol's heightened environmental danger, directly leading to its prohibition. The ban aligns with international efforts to eliminate this chemical from marine applications.

Washington boaters can adopt several environmentally conscious practices:

• Silicone-based coatings create ultra-smooth surfaces that deter marine growth without toxic releases
• Epoxy barrier systems provide durable protection while minimizing environmental impact
• Regular hull cleaning maintains performance without chemical dependence
• Advanced cleaning technologies including ultrasonic and in-water systems offer non-toxic alternatives

These measures comply with state regulations while protecting Washington's marine ecosystems for future generations. The Department of Ecology continues monitoring emerging technologies and will issue updated recommendations by 2029.