B. Groundwater Quality

There are water quality problems in deep wells in specified parts of the alluvial plain and in the Island Garden City of Samal. Major water quality problems are brackish water in the southern part of alluvial plain, and high Fe and Mn contents in northeastern portion. In the Island, typical water qualities of deep well and spring sources have high Ca and Mg contents due to mineral rich recharge area formed by limestone. Also in west seashore belt of island, saline water intrusion is now reported due to over exploitation. The result of water resources investigation for the province conducted by the National Water Resources Board (NWRB) and general information from Department of Public Works and Highways (DPWH) and Provincial Engineers Office (PEO) revealed the following problem areas.