Presidential Decree
| Document No. | Title | Date Approved |
| PD 1067 | THE WATER CODE OF THE PHILIPPINES |
Republic Act
| Document No. | Title | Date Approved |
| RA 9275 | An act Providing for a Comprehensive Water Quality Management and for other purposes | March 22, 2004 |
Department Administrative Order
| Document No. | Title | Date Approved |
| DAO 2016-19 | Designation of the Cañas-Maalimango River Water Quality Management Area and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-18 | Designation of the Naguilian River System Water Quality Management Area and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-17 | Designation of the Talomo River Water Quality Management Area (WQMA) and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-16 | Designation of the Tagoloan River Basin Water Quality Management Area and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-15 | Designation of the Ayala River Water Quality Management Area and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-14 | Designation of Lake Sebu Water Quality Management Area and Creation of its Governing Board | June 21, 2016 |
| DAO 2016-08 | Water Quality Guidelines and General Effluent Standards of 2016 | May 24, 2016 |
| DAO 2016-06 | Designation of the Sabang Bay Water Quality Management Area and Creation of its Governing Board | May 3, 2016 |
| DAO 2016-05 | Designation of the Coron Bay Water Quality Management Area and Creation of its Governing Board | May 3, 2016 |
| DAO 2016-04 | Designation of the Naga River Watershed Water Quality Management Area and the Creation of its Governing Board | April 18, 2016 |
| DAO 2016-03 | Designation of the Bued River System Water Quality Management Area and Creation of its Governing Board | April 18, 2016 |
| DAO 2009-12 | Designation of the Sarangani Bay Water Quality Management Area and Creation of its Governing Board | November 6, 2009 |
| DAO 2009-11 | Designation of the Iloilo Batiano River Systems Water Quality Management Area and Creation of its Governing Board | November 6, 2009 |
| DAO 2007-28 | Institutionalizing the Manila Bay Environmental Management Project within the DENR through the Implementation of the Operational Plan for the Manila Bay Coastal Strategy (OPMBCS) | July 31, 2007 |
| DAO 2005-10 | Implementing Rules and Regulation of the Philippine Clean Water Act of 2004 (Republic Act. No. 9275) | May 16, 2005 |
| DAO 2004-25 | Amending Chapter V, Article I of the Implementing Rules and Regulations of PD 984 by deleting the authority to construct and conversion of Permit to Operate to Discharge Permit for water pollution source/control facilities | August 25, 2004 |
| DAO 2003-39 | Implementing Rules and Regulations of DAO 16, Series of 2002 Entitled “The DENR-EMB National Environmental User’s Fee of 2002 | August 18, 2003 |
| DAO 2003-27 | Amending DAO 26, DAO 29 an DAO 2000-81 Among others on the preparation and submission of Self Monitoring Report (SMR) | July 4, 2003 |
| DAO 2003-26 | Revised Industrial Ecowatch System Amending Implementing Guidelines of DAO 98-51 Series of 1998 | July 4, 2003 |
| DAO 1994-26A | PHILIPPINE STANDARDS FOR DRINKING WATER 1993 UNDER THE PROVISION OF CHAPTER II, SECTION 9 OF PD 856, OTHERWISE KNOWN AS THE CODE ON SANITATION OF THE PHILIPPINES | |
| DAO 1990-34 | Revised Water Usage and Classifications Water Quality Criteria Amending Section Nos. 68 and 69, Chapter III of the 1978 NPCC Rules and Regulations | March 20, 1990 |
DENR Memorandum Circular
| Document No. | Title | Date Approved |
| DMC 2016-08 | Additional List of Classified Water Bodies | June 27, 2016 |
| DMC 2009-01 | Additional List for Classified Water Bodies | February 25, 2009 |
| DMC 2007-10 | List of classified Water Bodies in 2006 | July 25, 2007 |
| DMC 2005-006 | List of Classified Water Bodies in 2004 | June 23, 2005 |
| DMC 2004-13 | List of Classified/ Re-classified Water Bodies in 2003 | August 31, 2004 |
| DMC 2004-11 | Compliance of all Wastewater Discharges to Upgraded and Reclassified Waterbodies | August 31, 2004 |
EMB Memorandum Circular
| Document No. | Title | Date Approved |
| EMB MC 2020-001 | Suspension on the Implementation of Advanced Training Modules for Pollution Control Officers | January 22, 2020 |
| EMB MC 2020-002 | Reiteration on the Implementation of Sections 10 and 14 of DENR Administrative Order No. 2014-02 | January 23, 2020 |
| EMB MC 2020-004 | Clarification on the Reporting Requirements for Specific Parameters Under DENR Administrative Order No.. 2016-08 or the Revised Water Quality Guidelines and General Effluent Standards of 2016 | January 29, 2020 |
| EMB MC 2020-006 | Clarification in the Implementation of Rules 13.8 and 14.18 of DENR Administrative Order No. 2005-10 | February 12, 2020 |
| EMB MC 2019-001 | Supplementary Clarification on the coverage of DAO 2016-08 Relative to the Granting of not more than five (5) Years Grace Period | January 31, 2019 |
| EMB MC 2019-04 | Advance Training Modules for Pollution Control Officers (PCOs) | March 26, 2019 |
| EMB MC 2016-12 | EMB Approved Methods of Analysis for Water and Wastewater | November 21, 2016 |
| EMB MC 2013-06 | Guidelines for Water Quality Management Area Action Planning and LGU’s Compliance Scheme | August 29, 2013 |
| EMB MC 2012-001 | Clarification on the Applicability of Effluent Regulations | February 17, 2012 |
| EMB MC 2009-15 | Procedural Manual for the Designation of Water Quality Management Areas | |
| EMB MC 2009-14 | Strict implementation of the 50 Meters Buffer Zone | |
| EMB MC 2009-002 | Amending Revised Procedural Manual for DAO 03-30 dated 30 June 2003 on the Classification of the Fast-food Stores, Restaurants and Similar Quick-Service Establishments | January 23, 2009 |
| EMB MC 2004-10 | Clarification on the form of Cyanide referred to in the DENR Administrative Order (DAO) No. 34: Revised Water Usage and Classification/Water Quality Criteria and the DENR Administrative Order No. 35: Revised Effluent Standards of 1900 | August 31, 2004 |
| EMB MC 2003-008 | Procedural and Reference Manual for DAO 2003-27 | August 25, 2003 |
| EMB MC 2003-006 | Implementation Scheme for Industrial EcoWatch System 2003 | |
| EMB MC 2014-002 | Recognition of PCO Training Organizations or Institutions |
Joint Memorandum Circular
| Document No. | Title | Date Approved |
| JMC 2009-01 | Creation of the La Mesa watershed Multi-sectoral Management council and defining its functions | July 21, 2009 |