The Hawaii Stormwater Control Ordinance (HI SCO) is a regulation implemented by the state of Hawaii to manage and control stormwater runoff. It aims to protect the quality of water bodies and prevent pollution caused by stormwater runoff. The HI SCO mandates the adoption of the best management practices (BMPs) to mitigate the adverse impacts of stormwater runoff on both the natural environment and human health. The Hawaii Stormwater Control Ordinance requires various types of construction and land development projects to obtain permits and comply with specific stormwater management guidelines. These permits are issued by the Hawaii Department of Health's Clean Water Branch (CWB). The ordinance applies to all projects that disturb more than one acre of land, including residential, commercial, industrial, and infrastructure development. There are different types of permits and requirements under the Hawaii Stormwater Control Ordinance: 1. Construction General Permit (CAP): This permit is issued to construction projects that disturb more than one acre of land or are part of a larger common plan of development. It requires the implementation of erosion and sediment control measures, as well as stormwater management practices minimizing pollution. 2. Industrial General Permit (IGP): This permit applies to industrial facilities that have the potential to discharge pollutants through stormwater runoff. It sets specific requirements for stormwater management, pollutant control, and monitoring to ensure compliance with water quality standards. 3. Municipal Separate Storm Sewer System (MS4) Permit: The MS4 permit governs stormwater management in urbanized areas with municipal storm sewer systems. It applies to cities, towns, and counties responsible for stormwater infrastructure. MS4 permit holders must develop comprehensive stormwater management plans, monitor water quality, and educate the public about stormwater pollution prevention. The Hawaii Stormwater Control Ordinance incorporates various best management practices, such as installing sediment basins, vegetative buffers, and stormwater detention ponds. These practices help filter sediment, reduce erosion, and improve the quality of stormwater runoff. Inspections and regular maintenance are also required to ensure that stormwater control measures continue to function effectively. Overall, the Hawaii Stormwater Control Ordinance is a vital regulatory framework aimed at safeguarding water quality while promoting sustainable development practices. By adhering to these regulations, Hawaii strives to protect its unique coastal and marine resources, as well as the overall wellbeing of its residents and visitors.