When is a Storm Water Quality Management Plan (SWQMP) required?
See the Regulations of Harris County for Storm Water Quality for specific requirements. Generally, a SWQMP is required for new development of a 5-acre or larger parcel of land regardless of the amount actually being disturbed. A SWQMP is required for re-development of a 5-acre or larger parcel where 1 acre or more of impervious surface is being added. Two common exemptions from developing a SWQMP are grandfathering by an existing storm sewer line (pipe) or by filing an Industrial Activities Certificate.
