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San Antonio Testing Laboratory LLC is a privately owned and locally operated testing facility that provides environmental and industrial analytical services. Tailored for private, corporate, and public needs, we offer fast response times and rigorous quality assurance. We are proudly a hispanic woman owned business that has been operating since 1987.


Our extensive experience assisting clients with routine testing and large scale contracts is paired with up-to-date technologies and techniques, allowing us to focus on client satisfaction and ever changing regulatory requirements, academic discoveries, and industry innovations. We take pride in our thorough quality control to ensure all data is accurate and meets strict protocols and inspections. To ensure accurate reports, this includes following sample collection, container, preservation, preparation, cleaning, and method standards from USEPA SW-846 and USEPA 600/4-79-020.


If you would like more information or have any questions, please contact us.


Texas Commission on Environmental Quality, TCEQ, NELAP certified laboratory. TNI approved proficiency test sample for Water Pollution -Water Supply and Solid Waste matrices.

Certification No. T104704360


HUB: Historically Under Utilized Business Program Minority and Woman Owned Business
State of Texas
Certificate/VID No.1471089620100

Small, Minority, Woman Owned, Hispanic-American, Disadvantaged Business
South Central Texas Regional Certification Agency
Certificate No. 220098942

Marcela Gracia Hawk


​BBA Management, Pan American University


Over thirty years of financial, managerial, and personnel administration experience with more than twenty years laboratory management experience. Past Vice-Chairman and Program Director for the Alamo Laboratory Analyst Chapter of the Texas Water Utilities Association. Member of the Texas Water Utilities Association and San Antonio Manufacturer's Association.

Richard Hawk

General Manager

Northern Michigan University

Thirty years experience in laboratory management, operations and administration. Past President of the Alamo Laboratory Analyst Association. Past Chairman of the Lab Analyst's Section of the Texas Water Utilities Association and former Board Member for the San Antonio Manufacturer's Association.


Laboratory Manager

Sairam Abburu


MS, The University of Texas at San Antonio


In his multi-faceted role, Sai utilizes his 25 years of experience in environmental laboratory management & operations, project management, and quality management. He has laboratory experience in extraction and analysis of organics and inorganic pollutants as well as various analytical instrumentation including GC, GC/MS, HPLC, ICP, ICP-MS, and IC. Additionally, he is extensively knowledgable on QA/QC procedures, including NELAP & TNI standards, EPA SW-846, and various wastewater, drinking water and general chemistry methods. Sai is especially knowledgeable on drinking water regulations with respect to public water systems.


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