The City of Tucson, Arizona is working to alleviate urban heat islands, which will be exacerbated by climate change, in lower-income neighborhoods through a Low-Income Rainwater Harvesting Program. While Tucson had previously promoted rainwater-harvesting programs through rebates, these were not affordable or accessible for its lower-income and Latinx communities, who are most vulnerable to heat stress and the effects of rising temperatures. Maps developed by the city and county showed that the lower-income neighborhoods, mostly on the south side of Tucson, had significantly less tree canopy than more affluent neighborhoods. As a result, south side neighborhoods can be up to five degrees hotter than the greener north side. To address this challenge, in 2016 the city provided a grant to the Sonora Environmental Research Institute (SERI) to administer a program to make funding available to lower-income Tucson citizens to install rainwater capture systems. Depending on household income, the program provides zero-interest loans of up to $2,000 and grants of up to $400 for the installation of the rainwater harvesting system to facilitate watering of trees and other landscaping to reduce heat islands. As a result of this program, since 2018 over 100 harvesting systems have been successfully installed in low-income households.