Drinking water quality assessment: lessons learnt from Ogun State, Nigeria

摘要

A drinking Water Quality Assessment survey was carried out in Ogun State Nigeria in 2009. Therncollected water samples were analysed in the laboratory to determine compliance with the NigerianrnStandard for Drinking Water Quality (NSDWQ) and the WHO Guideline Values (WHO GLV). Resultsrnfrom the Study showed that high Coliform counts were recorded in many sampled sites. Only 7%rncompliance was recorded for the total number of samples, which needs further investigation. The pHrncompliance was 10%. In most areas of the State, pH range varied from 4.4 to 6.4 while Arsenic recordedrn100% compliance. There was 100% compliance for Nitrate and heavy metals such as Chromium,rnCadmium and Lead. Iron had 86.4% compliance ranging from 0.34mg/l -2.88mg/l. The Lessons learnedrnwere that Drinking Water Quality assessment is intensive and expensive but valuable in building therncapacity of the all collaborating water organizations. It has also generated a need for revalidation studyrnto reconfirm the level of some contaminant in some specific locations that fall short in the sanitary riskrnassessment scores.