Water Quality Standards Regulations: Puerto Rico

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.

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

---

Territory Standards in Effect for CWA Purposes

• Puerto Rico Water Quality Standards Regulation (pdf) (7.09 MB)
  (Effective November 23, 2022) Water Quality Standards for Puerto Rico.

---

Federally Proposed or Promulgated Standards

• 40 CFR §131.40   Puerto Rico
• 40 CFR §131.42   Antidegradation Implementation Methods for the Commonwealth of Puerto Rico