Environmental Impact Assessment (EIA) Reports contain findings on the biophysical, social and health impacts of a proposed project and the corresponding positive and negative impacts the project would have on the environment. It also contains information that would aid environmental decision making. Over the years, EIA Reports have at best been seen as satisfactory. It is based on this understanding that this study reviewed the quality of 33 EIA reports selected by convenience sampling from the oil and gas industry from 1994-2019. The study used the 2001 European Commission Checklist and the Smith 1984 Model for the assessment. The study revealed that EIA reports improved from a grade D in 1994 to A in 2016. The assessment of cumulative impacts revealed that this area improved over time. 48.48% of the reports neither mentioned nor assessed cumulative impacts, 33.33% did mention cumulative impacts but did not assess them while 18.18% mentioned and assessed cumulative impacts. Improvement in quality was more visible in the areas of the project characteristics, non-technical summary, consideration of alternatives, mitigation measures and presentation. The area of public participation documentation however, still needs improvement. The paper recommends that for public participation, a minimum requirement for documented information in the report is required and the 1984 Smith’s Model should be used as the minimum requirement for public participation appraisal. It also recommends that public participation effectiveness in EIA reports be measured by the outcome of set objectives of various aspects of the consultation process