California will receive funding worth more than $182 million (£127.4m) for water and wastewater projects.
The investment aims to reduce water pollution, improve municipal drinking water and wastewater infrastructures and make projects more sustainable by increasing energy efficiency.
The money from the Environmental Protection Agency (EPA) includes $37 million (£25.9m) to double the capacity of a water recycling plant in the city of Carlsbad.
EPA’s Regional Administrator Jared Blumenfeld said: “This substantial investment at the federal level helps communities like Carlsbad provide sustainable sources of water in the face of California’s historic drought. EPA is committed to protecting the state’s water resources so critical to our environment, public health and economy.”
In the UK a new scheme aimed at protecting the source of drinking water from contamination by mine water has been launched at Whitburn.