Leading rainwater harvesting installers in Houston, Texas.
Texas law provides a sales-tax exemption for qualifying rainwater-harvesting equipment and supplies, limits certain property-association restrictions, and sets cross-connection safeguards for systems with an auxiliary public-water supply. Local construction and health requirements may also apply.
Rainwater planning estimate
Estimate annual roof collection separately from the storage needed to cover your chosen daily demand and reserve period.
Collection formula: roof area × annual rainfall × 0.6233 × runoff efficiency. Storage target: daily demand × reserve days. This screening estimate does not model monthly droughts, tank overflow, local roof geometry, water quality, permits, or structural requirements. Rainfall source: NOAA National Centers for Environmental Information, U.S. Monthly Climate Normals, 1971-2000; verified 2026-09-14.
The Texas Water Development Board explains statewide tax and property-law provisions and publishes rainwater harvesting guidance. Statewide guidance; local plumbing, health, and building rules may add requirements.
Last reviewed 2026-09-14; Guidance resource, not a rebate promise.
Provider details are shown with their evidence status. Verify licensing, insurance, and scope directly before hiring.
3890 North Fwy Suite B, Houston, TX 77022
Rainwater harvesting involves structural engineering, filtration, and plumbing compliance. Before signing an installation contract, ensure your contractor addresses these key items: