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DAO 1990-34
Revised Water Usage and Classification / Water Quality Criteria
DAO 1990-35
Revised Effluent Regulations of 1990 (Revising and Amending the Effluent Regulations of 1982)
DAO 2016-08
Water Quality Guidelines and General Effluent Standards of 2016
RA 9275
Philippine Clean Water Act of 2004
DAO 2021-19
Updated Water Quality Guidelines (WQG) and General Effluent Standards (GES) for selected parameters.
DAO 2007-26
Guidelines on the Procedures and Technical Requirements for the Issuance of a Certification Allowing the Safe Re-use of Wastewater for Purposes of Irrigation and other Agricultural Uses