‘Pesticide’ is a general term for substances which are used to poison pests. Pesticides slip to surface and groundwater primarily from runoff. This runoff appears from crops and are major in agricultural areas. Agriculture is not only way to pollute drinking water. You can meet pesticides on golf courses, forested areas, along roadsides, and in suburban and urban landscape areas. It gives the particular results. If there are not any proper safeguards pesticides can be a very dangerous thing to many drinking water supplies and groundwater.

Approximately 50% of the U.S. population gets its drinking water from groundwater sources. About 95% or more of the population in agricultural areas uses groundwater as a source of drinking water.

The pesticides most acutely dangerous to man as insecticides and rodenticides, although pound for pound. Widely used type of pesticide is herbicide.

However, not all pesticides are seriously toxic to humans or other non-target species.

Five pesticides were initially selected due to the frequency of their occurrence: alachlor, atrazine, cyanazine, metolachlor, and simazine. According to the Environmental Protection Agency (EPA) they all have been detected in many states, and they can achieve levels which exceed health based standards. All of these pesticides are associated with serious danger for human health which effects including cancer.

In U.S. there is a special Contamination Minimum level forms. It is an official document which helps to keep contamination level of water safe for human being.