Lyon metropole focuses on three types of actions to increase implementation of NBSWT. A primary local objective is to treat and reuse domestic wastewater and combined sewer overflow locally. Considering the goal of having 5% of the population of Grand Lyon (1.3 million inhabitants) served by NBSWT, choosing a compact technology (such as the ENTS pilot in France, which requires 1 m2 footprint per inhabitant) at a capital cost of 200 €/m2, there is a potential estimated market in of €13 million in the local region alone. The expected market at a national level at medium term is considerably larger.