This study aimed to assess the extent of implementation of Republic Act No. 11332, the “Mandatory Reporting of Notifiable Diseases and Health Events of Public Health Concern Act,” focusing on its influence on reporting practices among selected health facilities. Specifically, the study examined the relationship between independent variables—policy enforcement, awareness and training, reporting infrastructure, stakeholders collaboration, and resource availability and dependent variables such as reporting compliance, timeliness of reports, data accuracy, and public health outcomes. Conducted in Baybay Interlocal Health Zone during January – March 2025, the study tested the hypothesis that there is no significant correlation between the extent of Implementation and the level of effectiveness of the Mandatory Reporting of Notifiable Diseases and Health Events of Public Health Concern Act (RA 11332). Grouped Median, Standard Deviation and Rank Order were used to describe the respondents demographic profile and their level of experience regarding the extent of implementation of RA 11332. Additionally, Guilfords Pearson Correlation Coefficient “r” test (1956) was employed to determine the existence and strength of linear relationships between the variables, based on the coefficient (r) and significance level(p-value), provided the assumptions of the test were met. The research utilized a descriptive-correlational design. The respondents consisted of health professionals of a health facility, both private and public of the Baybay Inter-Local Health Zone of Laguna. Purposive sampling was used to select individuals involved in notifiable disease reporting processes. Data were gathered using a researcher-made and validated questionnaire. The research process included distributing and collecting survey forms, data tabulation, statistical analysis and interpretation of findings. Findings indicated that policy enforcement, awareness and training, and resource availability significantly influenced reporting compliance and timeliness of reports. Moreover, stakeholders collaboration and reporting infrastructure were positively correlated with improved data accuracy and better public health outcomes. The study concluded that the comprehensive implementation of RA 11332 requires a multidimensional approach addressing systemic gaps and enhancing inter-agency cooperation. Recommendations include improving training programs, increasing logistical and technological support, and strengthening policy monitoring and evaluation mechanisms.