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Classroom Challenge

An icon representing the in school challenge opportunity.

Join the competition! California classrooms and school-based clubs, grades 4-6, in a Cal Water Service area can participate.

Competition Calendar

Our Team

The Cal Water H2O Challenge is proud of the dedicated work of its team members and partners and all that they bring to the program each and every year.


Need advice on your project? Tips on submissions? Curious about additional resources? Speak with our teacher consultant.

Grants and Water Links

Looking for water project grants?  Links on water-related environmental issues?  Dive in!