Water is an important food and an important natural resource. In order to protect these are the Environmental Code and the EU directive given to water protection and related water protection regulations will be established for all water sources until 2010. Those who will prepare a water protection and related water protection regulations is the municipality or person responsible for water supply. The person then decides and declares the area as water protection and related water protection regulations are municipal or provincial government. The idea of creating a water protection is to protect the water supply and the body of water against pollution caused by point sources, diffuse sources and accidents combined. Hallstahammar Municipality has a water protection and related water protection regulations and those set up in 1997, the question is whether these are the needs to be revised. Literature studies on geological and hydrological conditions in Hallstahammar Municipality was also studying literature with regard to current legislation and other parameters needed to establish a water protection and related water protection regulations. Literature studies showed that the need to revise the map of the water protection zone, there were few and minor revisions were needed in their water protection regulations.