Water Lab

The McAllen Central Water Laboratory is accredited by the National Environmental Laboratory Accreditation Program. NELAP is a program governed by the Environmental Protection Agency and mandated through state agencies such as Texas Commission on Environmental Quality. By having implemented a NELAP Quality System, the laboratory maintains high standards for data quality and integrity.

The McAllen Central Water Laboratory’s responsibility is to assure the water plants product water provided to the citizens of McAllen is potable and 100% safe for consumption. In doing this, the lab performs on average 96,000 chemical and microbiological analyses annually. From providing water system analytical support to problem solving water quality concerns for our citizens, the water laboratory is on alert 7 days a week.

Tests Performed

Bacteriological Testing (NELAP Accredited thru TCEQ)

  • 120 city sample locations
  • QA/QC samples
  • Presence/Absence Total Coliforms
  • Presence/Absence E. coli
  • ATCC Culturing
  • Heterotrophic Plate Counts
  • Lab Prepared Medias

Chemical Testing

  • Total Hardness
  • Calcium Hardness
  • Chlorides
  • Alkalinity
  • Chlorine Residuals
  • Ammonia Residuals
  • Chloride Dioxide Residuals

Physical Testing

  • pH
  • Threshold Odor Number
  • Turbidity
  • Algae Counts
  • Jar Testing
  • Conductivity
  • Total Dissolved Solids

Analytical Testing

  • Total Carbon
  • Total Inorganic Carbon
  • Total Organic Carbon
  • Ion Chromatography
    • Chlorite (or analyte of interest)

Other State and Federal Testing

  • Metals
  • Minerals
  • Herbicides
  • Pesticides
  • Hydrocarbons
  • Volatiles
  • Polymer By-Products
  • Disinfection By-Products
  • Radionuclides

Contact Us

Have questions regarding your water at your home, school, or business? Call us at 956-681-1740.