Decision-makers always have incentives to choose proper emission strategies to maximize their individual economic and environmental benefits and the regional environmental game thus occurs when multiple decision-makers are involved in selecting the emission strategies. In this paper, environmental non-cooperative game model and cooperative game model were established for tidal network regions based on (1) sewage emission and its impact on environmental quality and (2) economic considerations, including tax benefits, pollution abatement costs and environmental losses. The Nash equilibrium of non-cooperative game indicated that, in the case of non-cooperation, no relations existed among the pollutant emission strategies chosen as each regional decision maker made its selection independently of others. On the other hand, in the presence of decision maker cooperation, the model was further divided into grand coalition game and sub-coalition game and the solutions to them were obtained. The characteristic function values were computed for all possible coalitions and the Shapley values were used to allocate the total payoff among all the participants with consideration of fairness. The results showed that, in the grand coalition game, the selection of the emission strategies was made by considering maximal global gains and the thus-selected emission strategies were well related with both the environmental loss coefficient and the environmental impact coefficient of all the participants. A case study of three tidal river network regions was conducted to verify the models, with the emissions and payoff being investigated under non-cooperative game and cooperative game situations. Compared with the non-cooperative game, in the cooperative game, the pollutant emissions were reduced by 17.98%, 15.36% and 5.55%, the payoff was increased by 2.17%, 3.21% and 1.25%, and the environment quality was increased by 14.24%, 13.33% and 10.52%, for three regions respectively. These results showed that a win-win outcome can be obtained in the tidal river network regions in cooperative game.