The San Antonio River Authority Laboratory

The San Antonio River Authority laboratory is a NELAP accredited laboratory that provides a wide range of analyses for drinking water and non-potable water testing. These analyses are available for a small fee to anyone wishing to have their water tested. Current lab customers include:

  • Municipalities
  • Water purveyors
  • Public Water Systems
  • Wastewater treatment plants
  • Consultants
  • Water bottlers
  • Other laboratories
  • Private Well Owners
  • General Public

Analytical Capabilities


Wet Chemistry Analysis:

Total Hardness
Total Phosphorus
Dissolved Phosphorus

Solids Analysis:

Total Suspended Solids
Total Dissolved Solids
Volatile Suspended Solids


Drinking water
Total Coliform (Presence/Absence)
E. coli (Presence/Absence and enumeration)

Non-potable water
E. coli enumeration

Solid & Chemical Materials
E. coli enumeration


Metals in Water:
The SARA Laboratory has been accredited for metals in water since 2009

Lead and Copper Monitoring Program

The Laboratory is currently one of a few TNI accredited laboratories in Texas offering Lead and Copper analysis to Public Drinking Water Systems for compliance with the Lead and Copper Monitoring Program. Samples submitted under this Program require specific forms.

Please contact the laboratory at 210-302-3649 for sample containers and additional information.

Drinking Water

Aluminum Chromium
Antimony Copper Silver  
Arsenic Lead Thallium  
Barium Manganese Uranium  
Beryllium Mercury Zinc  
Cadmium Nickel    



Non-potable Water

Aluminum Calcium
Antimony Chromium Manganese Sodium
Arsenic Cobalt Molybdenum Thallium
Barium Copper Nickel Uranium
Beryllium Iron Potassium Zinc
Cadmium Lead Selenium  


The SARA laboratory is capable of performing the IDEXX Colilert®-18 methods for presence/absence and enumeration of Total Coliforms and E. coli.

The Laboratory is also capable of analyzing BOD5, CBOD5, Non Distilled/Distilled Ammonia, Conductivity, Turbidity and pH.

The Laboratory also has the Dionex ICS-2100 and a DX2000 for the analysis of Nitrate, Nitrite, Sulfate, Fluoride, Bromide and Chloride; the TOC Fusion instrument for the analysis of Total Organic Carbon and the SEAL AQ2+ Analyzer for the analysis of Total Kjeldahl Nitrogen. The Laboratory also has an Agilent 7500 CE ICP-MS instrument for the analysis of Metals in drinking water and non-potable water, and a Beckman Coulter Spectrophotometer DU-800 for Chlorophyll-a and Pheophytin-a.

Staff Qualifications

  • The laboratory staff consists of degreed professionals from across the state of Texas and beyond.
  • The ESD staff are members of professional organizations to stay abreast of developing technologies and regulations.
    • The NELAC Institute
    • Alamo Laboratory Analyst Chapter

Laboratory Accreditation

The SARA Environmental Sciences Laboratory is accredited by the Texas Commission on Environmental Quality for the analysis of Drinking Water and Non-Potable water. Please refer to our Fields of Accreditation for Analysis that SARA is accredited to perform.

pdf Fields of Accreditation