1. An Overview of Groundwater Quality in Texas Cary L. Betz, P. G. Groundwater Planning and Assessment Team, Texas Commission on Environmental Quality

2. While much of the spotlight has been focused on determining how much groundwater is available, and where it is found...

5. Sampling and analysis of groundwater quality has also been taking place.

6. Groundwater Quality Programs USGS National Water Quality Assessment (NAWQA) Program

7. TWDB Ambient Groundwater Monitoring Program Groundwater Quality Programs

8. USGS National Water Quality Assessment (NAWQA) Program TWDB Ambient Groundwater Monitoring Program TCEQ Public Water Supply Drinking Water Quality Monitoring Program

9. NAWQA South Central Texas

10. NAWQA South Central Texas Trinity River Basin

11. NAWQA South Central Texas Trinity River Basin High Plains Regional Ground Water Study

12. Ambient Groundwater Monitoring 129,826 wells

13. Ambient Groundwater Monitoring 129,826 wells Anions, Cations, and Infrequent Constituents

14. Ambient Groundwater Monitoring 129,826 wells Anions, Cations, and Infrequent Constituents Major Aquifers

15. Ambient Groundwater Monitoring 129,826 wells Anions, Cations, and Infrequent Constituents Major Aquifers Minor Aquifers

16. Ambient Groundwater Monitoring 129,826 wells Anions, Cations, and Infrequent Constituents Major Aquifers Minor Aquifers Basis for the groundwater portion of the State’s Water Quality Inventory (305(b) report)

17. Public Drinking Water Monitoring Monitors “Entry Points” to Public Water Supply Systems

18. Public Drinking Water Monitoring Monitors “Entry Points” to Public Water Supply Systems Large suite of potential drinking water contaminants

19. Public Drinking Water Monitoring Monitors “Entry Points” to Public Water Supply Systems Large suite of potential drinking water contaminants Will be integrated into the 2004 Water Quality Inventory

20. The Water Quality Inventory For the past three report cycles, has represented selected Ambient Groundwater Monitoring data in a graphic format using GIS software

21. The Water Quality Inventory Nitrate was selected as the contaminant to be represented. Maps were constructed using the most recent data gathered for the major and minor aquifers

22. The Water Quality Inventory

23. For the 2004 edition of the report, other constituents of concern will be examined and represented graphically

24. The Water Quality Inventory For the 2004 edition of the report, other constituents of concern will be examined and represented graphically

25. The Water Quality Inventory For the 2004 edition of the report, other constituents of concern will be examined and represented graphically – including the “infrequent constituents”

26. The Water Quality Inventory This inventory, because of the relatively limited data that is available, cannot completely characterize the groundwater quality in the state

27. The Water Quality Inventory Additionally, the report does not seek to assign potential sources of contamination

28. The Water Quality Inventory Additionally, the report does not seek to assign potential sources of contamination

29. The Water Quality Inventory Additionally, the report does not seek to assign potential sources of contamination

30. The Water Quality Inventory Additionally, the report does not seek to assign potential sources of contamination

31. The Water Quality Inventory Additionally, the report does not seek to assign potential sources of contamination

32. The Water Quality Inventory As has been state in the report for several cycles, “The quality of groundwater in Texas is generally good”... which is not to say that we have no concerns.

33. The Water Quality Inventory Monitoring programs need to be maintained and enhanced to provide the best picture possible of groundwater quality.

34. There is Much Work to be Done