In all these cases, a clear target and transparent plan of action should be set over a long-term horizon. In California, the Sustainable Groundwater Management Act relies on semi-autonomous management in groundwater bodies. All groundwater bodies have to reach sustainability objectives by 2042, but they have the liberty’ to decide how to get there (see Box 4.3). In the case of water quality risks, Denmark has been introducing a targeted regulation for nitrate pollution into groundwater, imposing more strict oversight on farming zones that are more likely to lead to increased groundwater pollution (Hojberg, 2016).