Is too much water bad?

It can be bad: Drinking too much water can lead to severe disturbances of electrolytes in your blood which can cause devastating medical problems. Your best bet is to drink pure water whenever you are thirsty. If you are going to be working outside in a hot environment then drinking enough water to prevent thirst is ok. Just don't over do it.

Absolutely!: Very rarely water, just like any other substance, can be considered a poison when over-consumed in a short period of time. Water intoxication mostly occurs when water is being consumed in a high quantity without giving the body the proper nutrients it needs to be healthy. It may adversely affect the brain due to an electrolyte imbalance. It is, however, considered the least toxic chemical.

Depends : Occassionally people with psychotic polydipsia and SIADH can drink to much water and will have electrolyte abnormalities that may require restriction. Most of the time it is hard to drink excess water body hemostasis will regulate taste.