It is often difficult to definitively link a specific instance of disease to one particular cause, like water pollution. Even when tests show that drinking water is polluted, it can be hard to pinpoint the source of the contamination.

Atrazine - a herbicide often used on corn fields, golf courses and even lawns - has become one of the most common contaminants in American drinking water.

The Safe Drinking Water Act was passed in 1974 after tests discovered carcinogens, lead and dangerous bacteria flowing from faucets in New Orleans, Pittsburgh and Boston and elsewhere.

Government and other scientists have identified hundreds of chemicals that are linked to diseases in small concentrations and that are unregulated in drinking water or policed at limits that still pose serious risks.

Wherever we can find water we can produce oxygen, fuel and drinking water.

The toxic cocktail of pesticides in our drinking water can't be addressed by the chemical by chemical regulatory approach of government. Citizens can take action at the local level to reduce or eliminate pesticides in their own back yard, in their local parks and schools.