In the United States, the U.S Environmental Protection Agency is responsible for setting drinking water standards and for insuring their enforcement. This agency sets federal regulations which all state and local agencies must enforce. The Safe Drinking Water Act(SDWA) and its amendments contain specific maximum allowable levels of substances known to be hazardous to human health.
Pathogenic Organisms (Diseases) Transmitted by Water: Bacteria
Salmonella
bacillary dysentery
typhoid fever
paratyphoid
cholera
Viruses
Enterovirus
Poliovirus
Coxsackle Virus
Echo Virus
Andenovirus
Reovirus
Reovirus
Infectious Hepatitis
Intestinal Parasites
amoebic dysentery
giardiasis
giant roundworm
Cryptosporidium
There are many processes to help ensure our water is safe to drink, much more than people realize.....coagulation and flocculation, sedimentation, filtration, disinfection, corrosion control, lab procedures etc etc... No idea if this contributed to heart probs or diabetes....although contaminated water definitely won't help matters. We had several people here in Canada living in a small town(Walkerton) that died from contaminated water.
Look into things that will help optimize your immune system especially for your child as it's not typical to be that sick that often.