The standard articulates one of the broad goals of the Aquatic Invasive Species (AIS) program, to reduce the economic impacts of AIS in Lake Tahoe. AIS are non-native organisms that threaten the abundance and diversity of native organisms in Lake Tahoe. Non-native species have been intentionally and unintentionally introduced to the Tahoe Basin over the last 150 years. Economic impacts of AIS can include potential costs to tourism, property owners, boaters, and maintenance. Watercraft inspection stations around the Region seek to prevent the introduction of new aquatic invasive species to Lake Tahoe, and there are numerous projects to remove existing AIS infestations.