Water Quality Standards Regulations: Texas

Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.

The EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", the EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that the EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.

• What is a New or Revised Water Quality Standard Under CWA 303(c)(3)? - Frequently Asked Questions (pdf) (108.04 KB)

• State Standards in Effect for CWA Purposes
• Federally Proposed or Promulgated Standards

State Standards in Effect for CWA Purposes

• Texas Surface Water Quality Standards §307.1-307.10 (2022) (pdf) (4.78 MB)
  (Effective June 27, 2025) State regulation establishing water quality standards for surface waters of the state. Please note that not all parts of this document are effective for Clean Water Act purposes. Refer to cover pages for more information. The corresponding provisions which are in effect for Clean Water Act Purposes can be found in:
  • Texas Surface Water Quality Standards §307.1-307.10 (2018) (pdf) (3.69 MB)
    (Effective March 18, 2021) Not all standards are in effect for Clean Water Act purposes; refer to cover pages for more information.
  • Texas Surface Water Quality Standards §307.1-307.10 (2014) (pdf) (1.31 MB)
    (Effective September 23, 2014) Not all standards are in effect for Clean Water Act purposes; refer to cover pages for more information.
  • Texas Surface Water Quality Standards §307.1-307.10 (2010) (pdf) (1.59 MB)
    (Effective July 2, 2013) Not all standards are in effect for Clean Water Act purposes; refer to cover pages for more information.
  • Texas Surface Water Quality Standards §307.1-307.10 (2000) (pdf) (104.53 KB)
    (Effective July 2, 2013) Not all standards are in effect for Clean Water Act Purposes; refer to cover pages of 2010 and 1997 documents for more information.
  • Texas Surface Water Quality Standards §307.1-307.10 (1997) (pdf) (144.46 KB)
    (Effective April 30, 1997) Not all standards are in effect for Clean Water Act purposes; refer to cover pages for more information.
• Variances to Texas Surface Water Quality Standards (pdf) (223.82 KB)
  (Effective April 14, 2025) Information detailing the EPA-approved variances from water quality standards for dischargers to Texas surface waters.
• Water Effects Ratios and Site-specific Criteria in the Texas Surface Water Quality Standards (pdf) (183.69 KB)
  (Effective September 11, 2025) Information detailing the EPA-approved Water Effects Ratios (WERs) and Site-specific Criteria for Texas water quality standards.

Federally Proposed or Promulgated Standards

• None at this time.