A troublesome invasive species is
the quagga mussel, a tiny freshwater mollusk that attaches itself
to water utility infrastructure and reproduces at a rapid rate,
causing damage to pipes and pumps.
First found in the Great Lakes in 1988 (dumped with ballast water
from overseas ships), the quagga mussel along with the zebra
mussel are native to the rivers and lakes of eastern Europe and
western Asia, including the Black, Caspian and Azov Seas and the
Dneiper River drainage of Ukraine and Ponto-Caspian
The Quantification Settlement Agreement defines the rights to a
portion of Colorado River
water for four water districts in Southern California. It also
provides for a water transfer between the Imperial Valley and San Diego
for 35 years–the largest agricultural to urban water transfer in
the United States.