if you have a question for our guest, natalie exum, you can call us. our lines are regional.o it is (202) 748-8000 here in the eastern or central time zone. mountain or pacific, (202) 748-8001. last year the biden administration announced the proposal to replace all lead water service lines in the u.s. within 10 years. we started the conversation by you telling us re, it's extremely expensive. they're underground. how possible is this get tm all switched out in 10 years? guest: so, money needs to be allocated to be able to do this as well. the -- host: how much? guest: the bipartisan infrastructure law put $15 billion in for lead pipe finding and replacing. so that is a shot in the arm to get this started. but by no means is it going to be ae to fund all of the lead pipe replacements for the 9.2 million pipes that the e.p.a. is estimating is underground. host: when you said earlier, we're not quite sure where they are, so how do we know that we're, like our drinking water isn't coming out of lead pipes? can do after this show is go and look for their lead service lines. it's

jen: ed now by natalie exum -- we're joined exum, assistant scientist at johns hopkins bloomberg schoolw, a big probled say that as a society we've done a lot to get lead out of our population. we took it out of gasoline, we took it out ofaint e of the things that we have not dealt with yet is taking lead out of drinking water. because it actually means digging up a lot of old pipes. host: because it's too expensive? guest: it's too expensive, it's underground, we don't know where they are. we're living with a legacy of lead pipes under our host: so how -- what are the actual dangers of having lead in your drinking water? guest: yeah. well, if you think about it just as a low-doseic exposure over time. that in general is not good. but we're concerned about -- it's a neuro toxin so we're■ipmf our children, we're also concerned about our older populations and how we're seeing lead maybe be linked to dementia and such. we're concerned now. not a probe population but we're concerned about the vulnerable populations, meaning kids living in urban cities, right, where a lot of these lead ne in

and then natalie exum. they talk about efforts to limit and harmful chemicals in drinking water. c-span's washington journal, join in the conversation live at 7:00 p.m. eastern on c-span, c-span now, our free mobile app or online at c-span.org. president biden spoke about the collapse of the francis kottke branch in baltimore after being rammed by a container ship. the president noted his intention to have the federal government cover all reconstruction costs. >> sorry to keep you waiting. i was talking to the last members of the dat

and then natalie exum. they talk about efforts to limit and harmful chemicals in drinking water. c-span's washington journal, join in the conversation live at 7:00 p.m. eastern on c-span, c-span now, our free mobile app or online at c-span.org. president biden spoke about the collapse of the francis kottke branch in baltimore after being rammed by a container ship. the president noted his intention to have the federal government cover all reconstruction costs. >> sorry to keep you waiting. i was talking to the last members of the delegation. before i leave for north carolina, i want to speak briefly about the terrible incident and accident that happened in baltimore this morning. about one third of your container ships -- the bridge collapsed sending several people and vehicles into the water and multiple u.s. coast guard units were stationed very nearby thank god. and the coast guard was leading the response. >> one was -- to her rescue. one without injury and one critically. i spoke with governor moore this morning. the mayor of baltimore, the county executive, both the senator