About Our Firm

Todd Groundwater specializes in the planning, development, management and protection of GROUNDWATER.  We retain a tenured staff of professionals who know our clients and are highly responsive to their needs.  We are a certified Small Business Enterprise (SBE) and a certified Women's Business Enterprise (WBE).
Photo of David Todd
Dr. David Keith Todd

Our firm was founded in 1978 by Dr. David Keith Todd, an internationally recognized expert in groundwater hydrology and author of the widely-respected textbook, Groundwater Hydrology. Dr. Todd was an eminent professor and an accomplished speaker; we invite you to view his 2002 presentation to the California Colloquium on Water, which provides an introduction to groundwater basin management. As a pioneer in the field of groundwater, Dr. Todd mentored several of today's leaders in groundwater hydrology. Dr. Todd passed away in April 2006.

Dr. Iris Priestaf, President of Todd Groundwater, has more than 30 years of experience in groundwater assessments with a specialization in groundwater basin management. She directs both the technical and business aspects of company operations.

Photo of Iris and Phyllis
Iris Priestaf (left) and Phyllis Stanin

Our key management at Todd Groundwater includes Phyllis Stanin, Vice President and Principal Geologist. Our staff includes geologists, hydrogeologists, geographers, environmental managers, and civil engineers, all highly qualified in the groundwater field.


Certified Small Business Enterprise

Todd Groundwater is certified as a Small Business Enterprise (SBE) by the California Department of General Services, Certification Number 21517.

Certified Women's Business Enterprise

Todd Groundwater is certified as a Women's Business Enterprise by the Women's Business Enterprise National Council (WBENC), Certificate Number 2005126696.

We are also certified as a Women Business Enterprise (WBE) by the City of Los Angeles, File Number 11707, and as a Woman Business Enterprise by the North Central Texas Regional Certification Agency, Certificate Number WFWB62256N0616.


Cover of Groundwater Hydrology third edition

We Wrote the Book on Groundwater!

The third edition of Groundwater Hydrology by David K. Todd in collaboration with Larry W. Mays was published in July 2004 by John Wiley & Sons.

This new enlarged edition updates the second edition of 1980, the most widely-used book in the field with translations into six languages. The third edition adds numerous example problems, case studies, problem sets for student use, and more than 300 new figures and photographs. An entire chapter is devoted to presentation of groundwater modeling using the MODFLOW program of the U. S. Geological Survey. Groundwater contamination by chemicals receives expanded coverage, new references at the end of each chapter are given for research and graduate study, and web sites for hydrologic data and information are listed for U. S. Government and non-governmental sources.