DescentBB

http://www.smithsonianmag.com/science-n ... 180962030/

The team concludes that that avoiding lead contamination may require far more work than some think—and may even necessitate a nationwide overhaul of America’s outdated plumbing.

At least in older areas where lead piping was originally used for indoor plumbing and main feed lines. Unfortunately, there are a lot of those areas around the country and they're just a little water chemistry change away from disaster.

But lead piping is just the tip of the national iceberg. There are thousands of deficient bridges in every state of the union. Our whole infrastructure is falling apart. Where's the money going to come from?

https://www.fhwa.dot.gov/bridge/deficient.cfm