An EPA Stormwater permit is required for all construction sites which are 5 acres or larger. The area requirement is based on the total development, not just the portion currently under construction. In essence, this requirement is for all subdivisions in which the Preliminary Plat (or Final Plat, if a preliminary is not required) is 5 acres or more. No earthwork can take place on an EPA permitted site (or a site eligible for an EPA permit) until a Stormwater Pollution Prevention Plan (SWPPP) has been developed and a Notice of Intent (NOI) filed with the EPA. Further information may be obtained at www.epa.gov.