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It has these ancient old pipes and they were using this chemical called sodium silicate to prevent the lead from leeching into the water. when they made the water acidic to deal with one problem they rendered the sodium silicate ineffective. now what we found in our report is they never did a test before doing that. the state was unaware they were doing this. city officials couldn't produce any tests that showed when they were looking to change the acidity, they wondered what other impact it might have on their water, so that's what started the snowballing effect from our report that brought u...

Hose size that connect to homes. they were flaking off coming off in the faucets. it took a year for the city to acknowledge this is happening across one of our water treatment areas. >> nick, without running a chemistry class here, like flint when they change the formulation of the drinking water at the source it depends how much goes down the pipes. there is an additive that is safe to consume and bathe keeping the lead more at bay. is that what happened here? >> there is an anti-corrosive inhibitor to create a film on the pipe preventing the ledge from getting in the water. what happened in...

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 failed that anyway in high school, like flint when they change the formulation of the drinking water at the source, that can change how much lead to cairn's point sloughs off the lining of these pipes. there is an additive to put in drinking water that's safe to consume and bathe that will keep...

Failed that anyway in high school, like flint when they change the formulation of the drinking water at the source, that can change how much lead to cairn's point sloughs off the lining of these pipes. there is an additive to put in drinking water that's safe to consume and bathe that will keep the lead at bay. is that what happened here? >> there's an anti-corrosive that prevents the lead from reaching into the water. and what happened in newark or one of the important theories is when they changed the acidity and dropped the ph level of the water, that kind of rendered the inhibitor that was...

About the senate. >> what about going at it economically. economic losses could be devastating in the future, let's look more immediately based on the median temperature projections for the states that voted for trump, let's put the list up, arizona ranks number 11 on that list. can you use the economy? can you use money? loss of money to get at the president? >> yes, i think you can use public health. you can use our urban areas, you can use arizona water scarcity, air quality, but you can also use the economy. the cost of doing nothing is going to be so significant. our shorelines, our coast...