Sampling Data Query, Surface Water Quality Monitoring

Data Structure and Use

The data that is available through this query includes data that was collected under a TCEQ-approved quality assurance project plan and met the requirements of NELAP (National Environmental Laboratory Accreditation Program, July 2008) for select laboratory analyses. 

Use of the data query requires knowledge of the file structures and protocols of the state's surface water quality monitoring program. 

Two files are associated with all data:

• The sampling EVENT file provides the station ID, sample date and time, sample depth, and the entity that did the sampling.  Station descriptions for each station identification number can be found using the Stations tables provided on the previous page.  Other codes can be identified by using the Data Management Reference Guide.
• The sampling RESULT file provides the monitoring parameter code and measurement information collected for each event.  There are many results for each event.  Parameter codes can be identified using the Parameter Code look-up on the previous page.

Structures and field descriptions for the EVENT and RESULT files:

• RESULT file format 
• EVENT file format

Data are available from 01/01/1968 to the present, and are updated the first week of every month.  Monitoring stations and activities have changed over time, therefore, data may not be available at select locations in any one year.

Query the Data

Select one of each item (file type, year, and basin or segment).  Query results are returned in delimited ASCII files.  Due to time-out issues with Microsoft Internet Explorer, it is important to SAVE THE TEXT FILE as soon as possible, or some records may be deleted.

Press to complete the query or to start over.  (Save the file as soon as possible to prevent the loss of data.)

For More Information

If you need assistance, or experience difficulty with queries run from this page, please e-mail  crp@tceq.texas.gov, or call (512) 239-6546.

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