Over the past few months there has been a spike in news stories related to elevated lead levels in U.S. public water systems, beginning with the crisis in Flint, Michigan. This has initiated investigations into current water testing methods and probes into violations that have been swept under the rug.
In many cases the public water supply is safe, but there's a hidden concern you need to know about – the immediate plumbing leading to drinking fountains, faucets, bathrooms, etc. in houses, apartments, schools, and workplaces could be leaching lead into the water. This can be caused by changes in water pH and temperature, additives, or the age and condition of pipes and connections.
Even though leaded gasoline, paint, and plumbing were phased out in the 1970s, they also will remain sources of lead exposure far into the future.