so, it affects all of us and i think that's an portant message. >> reporter: while brockovich's bookaints a dire portrait of america's water crisis,he's optimistic. while you argue that this is happening everywhere in the country, outside of flint, is there anywhere in the country where a community is meeting this head on or is further down the line in addressing their water situation? >> they are, and we share those stories with you in the book. the ladies of hannibal, missouri. ty're such amazing examples. so, they had lead in their water, some places higher than flint, because they used ammonia so, it started with a couple of moms, and i have to tell you, 9un9% of the time, every coy we're in, it's one pissed off mom. i don't know if i can say that on pbs, but it's true. and they're like, "oh, no, i'm my neighbor's child or myd or sister's chd." so, they begin to activate. they oftentimes will call us and and we begin educate them on what's going on with their system. in hannibal, they took of they went door to door and educated the town about ammonia and why it was causing lead.