California Water Science Center (CAWSC) - Yucaipa Valley Optimal Basin Management (OBM)

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Yucaipa Valley Hydrogeology

Welcome to the U.S. Geological Survey (USGS) Yucaipa Valley Hydrogeology website. This site provides hydrologic data collected or compiled by the USGS in the Yucaipa area; some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Greg Mendez
Phone: 619-225-6176

About Us

We are a dedicated group of scientists and professionals that take pride in collecting and analyzing quality data to develop and apply constrained optimization techniques to demonstrate their usefulness in a real-world setting for conjunctive management of ground-water pumpage, ground-water levels, ground-water quality, and artificial recharge of surface water.

If You Have Questions or Need Assistance...

Team members for this project are available to respond to your inquiry or direct you to someone who may be able to help.

Or you could use our web form which will send an email to a staff member.

We value your opinions and encourage you to use our web survey to better improve this website.

Volunteering, Intern Opportunities, Employment

The USGS, and the Yucaipa Valley Hydrogeology project in particular, occasionally have openings for volunteers, interns, post-docs, seasonal hires, and permanent employees.

If you are interested in volunteering or becoming employed by the USGS Yucaipa Valley Hydrogeology project, please submit the following 3 items via email to Greg Mendez, Project Chief of the Yucaipa Valley Hydrogeology project (

  1. Letter of interest -- we want to know why you want to volunteer or work for the USGS, and the Yucaipa Valley Hydrogeology project in particular;
  2. Unofficial college or high school transcripts -- we are interested in your complete academic record; and
  3. Resume -- we are interested in learning about you professionally, academically, and personally.

Thank you for your interest and time,
Greg Mendez
Project Chief
Yucaipa Valley Hydrogeology Project

Contact Us

4165 Spuance Road, Suite 200
San Diego, CA 92101
(619) 225-6100

Additional Resources May be Found Through the Following Search

image of search iconUSGS Search or use Frequently Asked Questions to find the specific USGS information, data, maps, products, or services that you need.

image of an online form iconUse our online form for feedback and questions about water. While we make every effort to reply to your inquiries as soon as possible, please allow up to seven days for a response.

Use the Electronic Phone Book to locate a specific USGS employee, or call toll-free 1-888-ASK-USGS (1-888-275-8747).


Contact Information for Other USGS Resources

USGS National Center
12201 Sunrise Valley Drive
Reston, VA 20192, USA 

Use the ASK USGS contact form for general USGS questions.

USGS Office of Communications staff is available to the media around-the-clock.