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Positive Lab Service
is a leader in the supply of high quality analytical services to the environmental industry in the compliance, assessment and remediation fields.  Satisfied clients perpetuate the success of Positive Lab Service.  We at Positive Lab Service recognize the importance of providing unmatched customer service and work accordingly.

Core services of hazardous waste, wastewater and groundwater analyses are provided at the stationary laboratory located in downtown Los Angeles, California.  Additional services include drinking water analyses, field sampling and sample pick-up/logistics.

Our Technology

The laboratory consists of the state-of-the-art organic and inorganic sections.  The organic section features automated volatiles and semi-volatile labs and a physically separated extraction lab.  The inorganic section consists of metals and wet labs.  Learn more about our capabilities.

Working On-Site With You
A mobile laboratory provides on-site real-time data for those projects requiring fuel-related, and volatile compounds analyses.  Multiple GC and GC/MS are provided to achieve multiple analytical methods.


Positive Lab Service
formerly known as the chemistry department of Smith-Emery Company, was incorporated in December of 1994 as a full service, independent analytical laboratory. Smith-Emery was founded as a chemistry laboratory in 1904, making Positive Lab Service one of the oldest continuously operating analytical laboratories in the western United States.  Since 1987, the laboratory's efforts have been focused on the environmental field. Steady growth of staff and facilities have resulted in Positive Lab Service's established reputation in the environmental marketplace.


Positive Lab Service has maintained California certifications as a hazardous waste, wastewater and drinking water laboratory since 1987.

Positive Lab Service is certified by IAPMO Research and Testing, Inc., to perform NSF 61 and Toxicity Testing.

Positive Lab Service holds the United States Department of Agriculture Soil Permit.

The rigorous Navy evaluation process was completed in 1994, allowing Positive Lab Service to provide NAVY CLEAN and RAC contracts support.

Army Corps of Engineers evaluation process (Missouri River Division program) was completed in 1995.

Positive Lab Service has been certified in the states of Oregon, Montana, Washington, and Alaska. Local certifications include County Sanitation Districts of LA County and California Regional Water Quality Control Board (Well Investigation Program).