Dinalupihan Water District (DWD) tasked to provide water services to concessionaires in the Municipality of Dinalupihan has been recertified by the International Organization for Standardization (ISO) in meeting the criteria for quality assurance and consistency and efficiency of services. The certificate is valid from April 05, 2020 until April 04, 2023. The DWD secured their first ISO-certification in 2017, as certified under the ISO 9001-2015 Quality Management System Certification by third-party auditor TUV Rheinland Philippines.