$128.90 per 267 m² billing unit of impervious surface, annual. We estimate impervious area per parcel from SCOOP aerial imagery + building footprints, calibrated against the City's published estimator.

Up to 50% total reduction across four categories: Peak Flow (40%), Water Quality (30%), Runoff Volume (30%), Operations & Activities (20%) — the four sum to 120% but the bylaw caps the total at 50%. Credits are valid for 5-year terms and must be renewed 3 months before expiry. No application fee; P.Eng certification required except for the Operations & Activities category.

Industrial, commercial, institutional, and multi-residential properties. Single-family residential pays a flat $11.40/mo and isn't credit-eligible.

A darker border around a parcel means a Stormwater Management report is on file — click for the structured analysis (consultant, qualifying credit categories, source PDF).