Your water company tests for lead drinking water. Ask them for a report – it’s free.
This report for San Francisco (and probably most other places) only tests for the water delivered to your water meter in the street.
If you are still concerned about lead drinking water, especially if an at-risk child is involved, we can test for lead in your drinking water. The lead would be coming from lead solder used in the plumbing between the street and the faucet. Water that sits in a pipe next to a lead solder will leak some of that lead into the water. So, clean the water by running the faucet or drinking fountain for a brief while before drinking.
Here’s what EPA has to say:
What About Testing For Lead In Drinking Water?
Lead pipes and lead solder were once used in plumbing and lead leaked into drinking water. Water testing is not routinely conducted by certified lead-based paint testing professionals, but you may ask for it as an optional service. If you would like information about testing for lead in water, call the EPA Drinking Water Hotline at 1-800-426-4791.”
Because of the previous extreme drought and our exploding population, SFPUC is adding groundwater to our drinking water. Groundwater is the dirty water that seeps through the ground and collects in an aquifer. There is an aquifer that stretches between Golden Gate Park and Lake Merced that officials want to use. In 2019 the water delivered to residents is “blended”: 85% Hetch Hetchy and 15% groundwater. Read more about this here.