The Washington Stormwater Control Ordinance (WACO) is a set of regulations implemented by the state of Washington to manage and control stormwater runoff. Stormwater runoff refers to the water that flows over land during rainfall events, picking up pollutants and carrying them into local water bodies. The primary goal of the WACO is to reduce the harmful effects of stormwater runoff on water quality and the environment. The Washington Stormwater Control Ordinance applies to various land uses, including residential, commercial, industrial, and construction sites. It sets forth specific requirements and standards that property owners, developers, and contractors must follow to prevent and reduce stormwater pollution. The ordinance promotes the use of the best management practices (BMPs) such as green infrastructure, pollution prevention techniques, and monitoring to mitigate stormwater impacts. In addition to the general Washington Stormwater Control Ordinance, there are specific requirements for different types of land use activities. Some notable types include: 1. Construction Stormwater General Permit (SWAP): This permit applies to construction sites disturbing one or more acres of land. It outlines erosion and sediment control measures, as well as requirements for watering and pollution prevention during construction activities. 2. Industrial Stormwater General Permit (SWAP): This permit targets specific industrial facilities, such as manufacturing plants, transportation terminals, and material storage sites. It establishes guidelines for managing stormwater runoff from industrial sites and requires the implementation of appropriate pollution prevention measures. 3. Municipal Stormwater Permits: These permits apply to cities and counties in Washington. They require the development and implementation of stormwater management programs designed to address stormwater runoff from municipal infrastructure and urban areas. Municipalities must work towards reducing pollutants and improving the quality of stormwater discharges. 4. Western Washington Phase II Municipal Stormwater Permit (MS4): This permit applies to cities and urbanized counties in the Puget Sound and other western Washington regions. It focuses on managing stormwater runoff in these urban areas, aiming to protect and restore water bodies and associated ecosystems. By adhering to the Washington Stormwater Control Ordinance and its related permits, businesses and communities play a vital role in protecting the state's water resources, minimizing pollution, and ensuring a sustainable environment for future generations. Compliance with these regulations helps in controlling the quantity and quality of stormwater runoff, resulting in healthier watersheds and enhanced water quality throughout Washington.