The Centers for Disease Control and Prevention (CDC) released official guidance regarding this issue.

According to the CDC, there is no evidence that COVID-19 can be spread to humans through the use of pools and hot tubs. Proper operation, maintenance, and disinfection (e.g., with chlorine and bromine) of pools and hot tubs should remove or inactivate the virus that causes COVID-19.

This guidance and other water-related guidance can be found here.