Stormwater Pollution Prevention PlanSWPPP

The Stormwater Pollution Prevention Plan — SWPPP — is the document the Clean Water Act NPDES permit requires an industrial facility or a construction site to maintain, to keep the rain that falls on the site from carrying the pollutant off it and into the receiving water. The industrial facility operates under the EPA Multi-Sector General Permit, the MSGP, and the construction site over an acre operates under the Construction General Permit, the CGP, and both permits require the SWPPP before the discharge begins. The plan identifies the pollutant sources — the loading dock, the fuel storage, the material stockpile, the disturbed soil — and the best management practices, the BMPs, that keep the pollutant out of the runoff: the berm, the silt fence, the oil-water separator, the good-housekeeping practice.

The SWPPP lives on the inspection, not the document. The permit requires the comprehensive annual site inspection and the quarterly or routine visual assessment of the stormwater discharge, and the inspection that finds the silt fence failed or the stockpile was left uncovered is the one that triggers the corrective action before the runoff carries the pollutant to the creek the regulator samples. The honest SWPPP is the one where the BMP is in the field and the inspection record proves it, not the one where the document is filed and the field is unmanaged — because the NPDES violation is the discharge, and the discharge is what the inspector sees, not what the plan says. The SWPPP pairs with ISO 14001 on the environmental system and the ESG report on the water disclosure. See ISO 14001 and ESG.