Sierra's laboratory facility is located in Laguna Hills, California, and occupies approximately 5,000 square feet. The laboratory consists of five Departments: General Wet Chemistry, Metals, Organics, Microbiology, and Mobile Laboratory (Currently Unavailable). Sierra is a complete environmental laboratory that is certified by the Department of Health Services (DOHS) ELAP No. 2320. In addition, Sierra is an approved industrial wastewater sampling and testing laboratory by the Los Angeles County Sanitation District, ID Number 10209, Orange County Sanitation District and South East Regional Reclamation Authority (S.E.R.R.A.).