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 City of Round Rock Environmental Services Laboratory
Questions & Answers

Is the Environmental Services Laboratory certified?
Yes.  The Environmental Services Laboratory has been accredited by the Texas Commission on Environmental Quality (TCEQ) since 1996 and by the National Environmental Laboratory Accreditation Program (NELAP) since 2007.  | Download the NELAP Accreditation Certificate.

What are the laboratory's operating hours?
The laboratory is open Monday through Thursday from 8 a.m. to 4 p.m., except on City holidays and on the day preceding the holiday.  Please call the laboratory at (512) 218-5561 if you need to submit samples outside of the laboratory's regular hours of operation.  (2014 Holiday Schedule.)

Where is the laboratory located?
The laboratory is located on the west side of IH-35 between the cities of Round Rock and Georgetown. | Map and directions.

How can I contact the laboratory?
Phone: (512) 218-5561
Fax: (512) 341-3316
E-mail: Water_Lab_Question
Mail: please contact the lab for mailing address

What testing services are available?
Bacteriological water testing (presence/absence) to identify Total Coliform and E.coli in water samples
 2.  E.coli enumeration testing for wastewater and ambient water samples
 3.  Calibration verification of field chlorine instruments

What is the cost per test?
Fee schedule

What is Total Coliform and E.coli?
Coliform organisms are bacteria commonly found in humans, animals and the environment. Their presence in water indicates that conditions in the water supply may also support the existence of other microbes, including pathogens. Pathogens are microbes (germs or "bugs") that cause illness. Coliform bacteria may not cause illness but they indicate that conditions are suitable for the existence of other microbes that can cause illness. The presence of E.coli bacteria is evidence of recent contamination of the water by animal or human feces.

What do the results mean?
If neither Total Coliform nor E.coli bacteria are detected in the water sample, the water is deemed potable.

If the sample tested positive for Total Coliform bacteria, conditions are suitable for the existence of other microbes that may cause illness.  The water should not be consumed without proper treatment.

A positive test result for E.coli bacteria indicates that the water supply has a connection with some unsanitary source.  The water should not be consumed without proper treatment.


For more information, please contact:
City of Round Rock Environmental Services Laboratory
Phone:  (512) 218-5561
Fax:  (512) 341-3316
E-mail:  Water_Lab_Question

Map and Directions

City of Round Rock | 221 East Main Street, Round Rock, Texas 78664 | Phone: (512) 218-5400
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