american society. so having established that, i know a large part of your work is getting to an answer to this. but what do we know so far about what did they know and when did they know it? >> we know that lead levs in the city began to spike in 2016. this is problem that's almost three years old. the city that the beginning insisted it was a problem with 12 homes because of old lead lines, old infrastructure, and it wasn't widespread. it wasn't until a year later in 2018 after the natural resources defense council sued that the city acknowledged that, yes, this is widespread problem. it's because we have 18,000 lead service lines in the city and these are these old lead pipes, kind of like garden hose size that connect waterlines to homes. and the lead in those pipes is flaking off and coming through the faucets. it took about a year for the city to acknowledge this is happening across one of our water treatment areas. >> nick, without running a chemistry class here because i