GWI supplies water to the various communities through two main sources, namely; well water from ‘A’ and ‘B’ sand wells and surface water from rivers, creeks, springs and canals. These sources have inherent characteristics which require respective treatment and monitoring to address the following parameters: pH, turbidity, color, iron, aluminum, total coliforms and E. Coli etc. The Corporation has 24 treatment plants which supplies water to 45% of its customers along the coast and 137 wells from which water is distributed directly to the network without first passing through a treatment facility. There are also clear water springs in the hinterland locations from which water is distributed directly to the network in a similar manner to the wells. 

GWI reorganized its Scientific Services department to allow institutionalizing the importance of water quality testing at all levels and the use of instrumentation and standards enforcement. The process as depicted below, shows the investigation of water quality, use of reports from lab testing and complaints or requests for testing to do sampling, testing, reporting and the adoption of appropriate interventions for quality control to ensure adherence to international standards. 

The Corporation believes that the sharing of information on water quality is important to its stakeholders (government and citizens) and thus will do so via interaction of its personnel with the RDC’s and NDC’s, customers