What is SWPPPin construction?

Under the EPA construction general permit, and the state permits that mirror it, coverage is required when a project disturbs 1 acre or more, or disturbs less than an acre but is part of a larger common plan of development or sale. Many municipalities add their own grading or land disturbance permits with lower thresholds, so check local requirements even on small sites. The operator files an NOI before disturbance begins.

The plan is usually drafted by the project's civil engineer or a SWPPP consultant, but preparation is not the legally significant act, certification is. The operator, generally the general contractor and sometimes the owner as co-permittee, certifies the SWPPP, files the NOI, keeps the plan current on site, and signs inspection reports. Subcontractors can install and maintain the BMPs, but the compliance responsibility cannot be subcontracted away.

The EPA construction general permit offers two routine frequencies: at least once every 7 calendar days, or at least once every 14 calendar days plus within 24 hours of a storm event of 0.25 inches or more. State permits set similar schedules. Inspections must be performed by a qualified person and documented, and the reports become part of the SWPPP record that regulators review during audits and enforcement visits.