Janet Walther, MS
Principal Biologist

Ms. Walther joined the firm in 2003 and has worked in the field of biology since 2000. She is responsible for performing botanical and wildlife surveys, wetland and waters of the U.S. determinations, data analysis, and reports in support of management agreements, permits, and mitigation monitoring. She assists clients in complying with the Federal Endangered Species Act, California Endangered Species Act, Sections 401 and 404 of the Clean Water Act, California Fish and Game Code, and local (county and/or city) regulations.

Ms. Walther works with clients to design projects that avoid or minimize impacts to threatened and endangered species. Where impacts are unavoidable, she helps create mitigation strategies and the application documents necessary to obtain the required permits, including habitat conservation and land management plans. 

In addition to her experience in biological surveying and reporting, Ms. Walther is responsible for preparation of environmental documents in compliance with the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA). She produces a variety of graphics for use in environmental and natural resources documents and routinely works with ArcGIS, AutoCAD, and Adobe Illustrator/Photoshop.

In previous positions, Ms. Walther inventoried both native and non-native species in compliance with regulatory requirements, and assisted in preparing California Energy Commission applications for certification for four major power projects in California. She also conducted biological survey work in Southern California and the High Desert wetland, in addition to endangered species survey work in Nevada, Arizona, Georgia, and Florida. 


  • M.S. – California State University Monterey Bay, Coastal Watershed Science and Policy, 2014
  • B.S. – California Polytechnic State University at  San Luis Obispo, Ecology and Systematic Biology, 2000 – Concentration: Environmental Management


  • Biology and Management of California Tiger Salamander Workshop, Elkhorn Slough Coastal Training Program, 2007
  • California Pesticide Application Certification, 2003/2004
  • Army Corps of Engineers Wetland Delineation Training, 2002
  • OSHA 40-hr HAZWOPER Certificate, 2001 and 8-hr Refresher Training, 2002-2007
  • Biology and Management of California Red-legged Frog Workshop, Elkhorn Slough Coastal Training Program, 2007


  • Contributor, Environmental Mitigation Handbook, California’s Coalition for Adequate School Housing, February 2009