Tracy, CA Environmental Rules: Flood Elevation Requirements (2026)

150 sets Tracy's construction standards for special flood hazard areas across four categories. Under "Anchoring," all new construction and substantial improvements must be adequately anchored against flotation, collapse, or lateral movement from hydrodynamic and hydrostatic loads, including buoyancy. Under "Construction Materials and Methods," flood-resistant materials and methods are required, and electrical, heating, plumbing, and HVAC equipment must be designed or located to keep water out during flooding. The core elevation rule sits in subsection (c): new construction and substantial improvements must have their lowest floor, including any basement, elevated one foot or higher above the base flood elevation, that is, one foot of "freeboard" above the FEMA 100-year flood level, with the finished elevation certified by a registered professional engineer or verified by the community building inspector and filed with the Floodplain Administrator.

Nonresidential structures get an alternative: instead of elevating, they may be floodproofed so the structure is watertight below the base flood level, with walls substantially impermeable to water and structural components able to resist hydrostatic and hydrodynamic loads, again certified by a registered engineer or architect. For enclosed areas below the lowest floor used only for parking, building access, or storage, the design must automatically equalize hydrostatic pressure on exterior walls, meeting either engineer certification or a minimum prescriptive standard: at least two openings totaling one square inch of net area per square foot of enclosed area, split roughly evenly across two separate walls, with the bottom of every opening no higher than one foot above grade. 180.