Texas state law protects the right to collect rainwater and prohibits cities and HOAs from banning rainwater harvesting systems. Tomball has no local ordinance restricting residential rain barrel or cistern use. Property owners may collect and use rainwater for irrigation and non-potable purposes without a city permit.
Texas actively encourages rainwater harvesting through multiple state laws. House Bill 3391 (2011) requires new state-funded buildings to incorporate rainwater harvesting and prohibits municipalities from banning residential rainwater collection systems. Texas Property Code Section 202.007 prevents HOAs from prohibiting rainwater harvesting devices on residential property. Texas Tax Code Section 151.355 provides a sales tax exemption for rainwater harvesting equipment including storage tanks, gutters, downspouts, filters, and first-flush diverters. Tomball does not impose additional local restrictions on rainwater collection. Standard rain barrels (typically 55 to 100 gallons) used for landscape irrigation do not require a city permit. Larger above-ground cisterns or storage tanks that exceed typical accessory structure thresholds may trigger a review under Tomball's building and zoning regulations. If rainwater is intended for potable indoor use, the system must comply with Texas Commission on Environmental Quality (TCEQ) guidelines including proper filtration, disinfection, and treatment. Cross-connections with the city water supply require backflow prevention devices per the Texas Plumbing Code. Tomball's location in the Spring Creek watershed with average annual rainfall around 50 inches makes rainwater harvesting particularly effective for supplemental irrigation.
There are no penalties for collecting rainwater in Tomball. If a large storage tank is installed without required building permits for oversized accessory structures, standard code enforcement penalties apply. Improper cross-connections with city water without backflow prevention may result in plumbing code violations.
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Side-by-side rule comparisons with other cities in Harris County.
See how other cities in Harris County handle rainwater harvesting.
See how Tomball's rainwater harvesting rules stack up against other locations.
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