You’re the first one I’ve seen with PPB. thanks
Check this out
https://en.wikipedia.org/wiki/Lead_contamination_in_Washington,_D.C._drinking_water
Apparently the crisis extends to Washington DC where thousands of home exceed the EPA 15ppb threshold.
That's been known for years, at least since the 1980s. Lots of older cities that were among the first to install water systems used lead in mains that there's either never a good time to replace, or they cry poor, wanting OPM to pay for the replacement.
You'd think that when the subway was built in DC (1970s)...yeah, right.