Water Quality Standards Regulations: Washington, DC
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.
On this page:
District Standards in Effect for CWA Purposes
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Water Quality Standards (21 DCMR Ch. 11) (2010) (pdf)
(Effective December 27, 2010) Regulations establishing water quality standards. Provisions are in effect for Clean Water Act purposes, with the exception of Section 1104.8. Please refer to the revised Section 1104.8. -
Section 1104.8, Water Quality Standards (21 DCMR Ch.11) (2020) (pdf)
(Effective August 5, 2020) This section contains updated numeric criteria and replaces the section posted in the 2010 standards. Please refer to the 2010 document, for the effective water quality standards in the remaining sections.