Click on the Category Check tool to the right and answer the series of questions to determine your project’s category. At the end, download a PDF that documents your answers and the result. Alternatively, you can click on the second link to the right for a table comparing all of the RRTWQ category criteria.
Before using the Category Check tool, you will need to know:
- If the project will require any NPDES, trenching, building, grading, grubbing, and/or stockpiling permits
- The total disturbed area (DA) – use the worksheet to the right for help calculating the DA
- The size of the project’s zoning lot
- If land disturbing activities will occur on slopes 15% or greater
- If there is a proposed cut or fill greater than 15 ft in height
- Whether the development will be used for single/two-family dwellings or other uses
Note: Where a development qualifies for more than one project category, the higher project category shall apply unless it meets the criteria for a Minor Development.
Each category has a different level of potential storm water pollution risk, and possesses its own specific set of requirements for its ESCP, Best Management Practices (BMPs), inspection frequency, etc. Click on the toolbox at the top of the page for more information about storm water requirements and other tools for your project’s category, and help to keep Hawaii’s waters clean, fishable, and swimmable.
Note: If the Category Check tool has determined that your project is either a Category 1A, 1B, 2, 3, 4, Trenching (< 1 acre) or Minor Development, see the Design Storm Water Tools (< 1 Acre) page instead for applicable design resources.