Can you collect rainwater in Texas?
Yes, you can collect rainwater in Texas, and the state is one of the most supportive in the US for rainwater harvesting. Texas has enacted laws protecting the right to collect rainwater, provided financial incentives, and integrated rainwater harvesting into its state water plan.
Legal Protection for Rainwater Harvesting
House Bill 3391, passed in 2011, prohibits homeowners associations from restricting the installation of rainwater harvesting systems on residential properties. In 2013, the Legislature further required HOAs to allow drought-resistant landscaping and water-conserving features. Texas law also explicitly states that captured rainwater is not subject to state water rights permitting — no permit from the Texas Commission on Environmental Quality is needed.
Tax Incentives
Texas offers one of the most generous tax incentive programs in the US. The Texas Constitution was amended to allow municipalities to offer property tax exemptions for rainwater harvesting systems. Many Texas cities and counties now offer this exemption. Additionally, rainwater harvesting equipment is exempt from state sales tax — rain barrels, tanks, pumps, filters, and pipes are all tax-free.
State and Local Support Programs
The Texas Water Development Board maintains a comprehensive rainwater harvesting website with design guides, calculators, and a directory of installers. Austin offers rebates up to $500 and free rain barrel workshops. San Antonio offers rebates up to $2 per gallon of storage capacity. Check with your local water utility for specific incentives in your area.
Design Considerations
Texas has highly variable rainfall — from over 50 inches annually in the east to under 10 inches in the west. Size your tank to hold at least 30 percent of annual water demand to bridge dry periods. Mosquito control is important in Texas where mosquito-borne diseases are a concern — all openings must be screened with fine mesh. Opaque tanks prevent algae growth in the intense Texas heat.
Rainwater Quality and Treatment in Texas
Texas has specific considerations for rainwater quality. In areas with significant agricultural activity, rainwater may contain elevated levels of ammonia, nitrates, and pesticide residues. Urban areas contribute atmospheric pollutants from vehicle emissions and industry. The extreme heat accelerates bacterial growth in storage tanks, making proper tank design and maintenance particularly important. For outdoor irrigation use, basic sediment filtration is usually sufficient. For indoor non-potable uses such as toilet flushing and laundry, carbon filtration and UV disinfection are recommended. For potable use, which is more common in rural Texas than in many other states, comprehensive treatment including reverse osmosis is advisable. The Texas Commission on Environmental Quality provides guidance on rainwater treatment. With proper design and maintenance, rainwater can be a safe and valuable water source in the Lone Star State.
Community Resources and Education
Texas has a strong network of community resources for rainwater harvesting enthusiasts. The Texas Rainwater Harvesting Association holds annual conferences and regional meetings where homeowners can learn from experts and share experiences. Many local conservation districts and water utilities offer workshops, demonstration sites, and rebate programs. The Texas A&M AgriLife Extension Service provides research-based information on rainwater harvesting for agricultural and residential applications. Online forums and social media groups connect Texas rainwater harvesters, allowing them to share tips, troubleshoot problems, and advocate for supportive policies. This strong community infrastructure makes Texas one of the most supportive states for anyone interested in starting a rainwater harvesting project.