Environmental Service Professionals, Inc. (ESP) operates in the indoor air quality sector in the United States. It develops and delivers procedures and tools to provide environmental services for addressing various environmental issues in the building, residential, commercial, and real estate industries. The company, through its subsidiary, National Professional Services, Inc. (NPS), trains and educates industry stakeholders and consumers through certification programs. ESP, through its subsidiary, Allstate Home Inspection and Household Environmental Testing, Ltd., offers home inspection and household environmental testing training curriculum along with the professionally-designated CEHI (Certified Environmental Home Inspector) program. The CEHI program consists of a suite of environmental services, such as allergen screening, energy inspections, neighborhood environment reports, radon testing, moisture management program, mold testing, and new builder program. The company was founded in 2002 and is based in Palm Springs, California.