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And also:

Giardia

Legionella

Norovirus

Shigella

Campylobacter

Copper

Salmonella

Hepatitis A

Cryptosporidium

E. coli, excess fluoride (tie)

Copper?

At high levels copper is toxic. USEPA requires drinking water systems to test for copper at endpoints.

Bioavailable copper, I assume.

Copper pipes should scale over.

Sure, but how would this kind of pipe promote the formation of copper?