Rainwater harvesting involves the capture, diversion, and storage of rainwater for later use. It’s a water conservation method an alternative water source and a water conservation method that can reduce the pressure on aquifer systems by reducing pumping needs.

Upcoming Rainwater Harvesting Events & Programs

  • AgriLife Rainwater Harvesting 101

    AgriLife Rainwater Harvesting 101
    September 18, 2025 @ 10:00 am - 12:30 pm

View past rainwater harvesting events.

Rainwater Harvesting Rebate Program

Post Oak Savannah offers a rainwater harvesting rebate to promote and encourage collection as a water conservation method. Rainwater harvesting can help reduce peak season pumping demands on our aquifers in the summer months, reduce stormwater runoff, and provide an alternative water supply source that will improve water quality and reduce erosion. For every 1 inch of rainfall 0.6 gallons can be collected for each square foot of collection surface ->  (2,000 sq. ft. roof) x (0.6 gallons) = 1,200 gallons harvested per 1 inch of rainfall. Application Form & Guidelines

Program Policy & Guidelines

Rebate Application Form

Form 01 339 Texas Sales And Use Tax Resale

Program Details & Qualifications

  • Applicants must reside or own land within the District (Burleson or Milam County).
  • Applicants must complete an approved Rainwater Harvesting 101 course to qualify.
  • Only one application per household can be filed within a 12 month period with a lifetime reimbursement maximum of $5,000.
  • Reimbursements are limited to $1.00 per gallon of the rainwater storage capacity of the completed system; includes tanks, gutter, tank foundation, overflow, and other misc. Items needed to create the system.
  • District staff must approve site plans before the purchase of reimbursable rainwater equipment and will be inspected after installation.
  • Short-term financial assistance may be available for qualifying applicants, contact the office for details.

Contact Grants Coordinator:

Courtney Gentry
admin@posgcd.org
(512) 455-9900

 

Rainwater Harvesting Resources

Not sure how big of a tank you’ll need?
Try out a few of these calculators, they’re designed to help determine how much water you’ll want to save and what size harvesting system will best suit your needs. 

TWBD Rainwater Harvest System Calculator

Texas AgriLife Rainwater Calculator

Need help planning your system?
Here are a few guides designed to help homeowners create their own system. 

Texas Rainwater Harvesting Manual  by the Texas Water Development Board

Rainwater Harvesting by Texas A&M AgriLife Extension Service 

Texas Tax Code Incentive
The Texas Tax Code §151.355 exempts rainwater harvesting equipment and supplies from state sales tax. To claim this exemption, a purchaser of rainwater harvesting equipment must furnish a Tax Exemption Application Form 01-339 to the supplier of the equipment.

Tax Exemption Application Form 01-339

Rainwater Tank Sources
POSGCD’s rainwater harvesting tanks uses for demonstrations were purchased from these suppliers.