The strive for sustainable good governance and human capacity development has always been a major challenge facing the multi ethnic society of Nigeria just like most countries in the Sub Saharan Africa. Consequently, there had been several transitions from civil rule to military rule and vice versa. The peculiar nature of the country as a heterogeneous society has had serious implications on the general performance of the Public Service which is the engine room of policy administration and implementation. The public service is also a veritable tool for the implementation of the Millennium Development Goals. However, its performance has been greatly influenced and undermined by ecological factors such as political, economic, social and cultural. This paper therefore examined the impact of the ecological challenges on the performance of the Nigerian Public Service using Riggs’ Prismatic Society model. The paper is predicated on the modernisation theory. It also relied on secondary data such as textbooks, journal articles and scholarly materials as its sources of information and data. The findings showed that the Nigerian Public Administration has not fared well in the implementation of the MDGs consequent upon the barrage of challenges facing it. It thus appears that the set target of 2015 will be a near impossibility if the Nigerian public service does not experience an urgent transformation and repositioning to meet these challenges.