Question 1

How much rainwater can my roof collect in Austin?

Accepted Answer

In Austin, a roof collects about 0.623 gallons per square foot for every inch of rain. With Austin's ~34.3" annual rainfall normal and a typical residential collection efficiency of about 85%, a 2,000 sq ft roof could realistically capture roughly 36,000 gallons per year. Enter your address for a property-specific estimate.

Question 2

How much water does one inch of rain produce from my roof?

Accepted Answer

One inch of rain yields about 0.623 gallons per square foot of horizontal roof footprint. A 2,000 sq ft roof produces roughly 1,246 gallons per inch of rain before system losses.

Question 3

Does Austin offer a rainwater harvesting rebate?

Accepted Answer

Austin Water advertises residential rainwater-harvesting rebates of up to $5,000 based on installed storage capacity. Eligibility and the final amount depend on program rules and system design — confirm current terms before purchasing.

Question 4

Is rainwater harvesting legal in Texas?

Accepted Answer

Yes. Texas actively encourages rainwater harvesting: harvesting equipment is exempt from state sales tax, and state law limits how HOAs can restrict residential systems.

How much free water hits your roof every year?