What law protects the state from the introduction of noxious weed seeds?

The Seed Law, codified in RCW 15.49, is specifically designed to regulate the sale and distribution of seeds, including the control of noxious weed seeds. This law establishes standards for seed quality, labeling, and purity, which includes provisions to prevent the introduction of noxious weed seeds into the state. By ensuring that only compliant seeds are sold, the law helps to protect the state's agricultural resources and natural ecosystems from the negative impacts of invasiveness that noxious weeds can cause. The careful regulation and monitoring of seeds through this law play a critical role in the broader effort to manage and mitigate weed-related issues in Washington.

Other laws mentioned do not focus directly on the prevention of noxious weed seeds; for instance, the Quarantine Law deals with controlling pests and diseases more generally, while the Restriction for Groundwater and Herb Sale and Use Regulations focus on different aspects of agricultural practices and environmental protection. Thus, the Seed Law is the correct answer as it directly addresses the concern of noxious weed seed introduction.