The California Stormwater Control Ordinance (CISCO) is a set of regulations implemented by the state of California to manage and control stormwater runoff that can contribute to pollution and the deterioration of water quality. It is part of the state's ongoing efforts to protect and improve the health of water bodies such as rivers, lakes, and coastal regions. CISCO requires municipalities and businesses that have stormwater runoff to implement the best management practices (BMPs) to minimize the negative impacts of stormwater on the environment. These ordinances aim to reduce pollutants entering storm drains and ultimately prevent contamination of soil, groundwater, and surface water sources. Under CISCO, there are different types of California Stormwater Control Ordinances that municipalities or regions may adopt. Some commonly enforced ordinances include the Construction General Permit (CAP) and the Industrial General Permit (IGP). The Construction General Permit (CAP) applies to construction activities that disturb more than one acre of soil. It requires construction site operators to implement erosion control measures, sediment controls, and other BMPs to prevent sediment discharge from leaving the construction site and polluting nearby water bodies. The Industrial General Permit (IGP) applies to various types of businesses, including manufacturing facilities, industrial sites, and certain commercial properties. These businesses are required to implement stormwater pollution prevention plans (Swamps) and implement BMPs to prevent or minimize the discharge of pollutants from their sites. The IGP encompasses a wide range of activities and industries, reflecting the diverse nature of California's industrial landscape. Other specific categories of stormwater ordinances may also be found within CISCO, tailored for different sectors or regions, such as municipal separate storm sewer systems (MS4s) and post-construction stormwater management. Overall, the California Stormwater Control Ordinance is a comprehensive framework of regulations aimed at preventing stormwater pollution and protecting the quality of water resources in the state. By adopting and enforcing these ordinances, California strives to achieve its long-term goals of clean and sustainable water systems for the benefit of both human and ecological health.