For instance, groundwater management districts in California charge between USD 18 (Santa Clara Valley) and USD 140 (Orange County) per acre-foot pumped in agriculture and up to over USD 600 to 1000 over a cap (Hanak et al., Germany applies a charge of EUR 0.0025 - 0.0026 per m3 used in agriculture in Bremen, Lower Saxony, while the state of Schleswig-Holstein applies a rate 100 times higher, of EUR 0.11/m3 for non-domestic uses (OECD, 2015c). Despite the important advantages that groundwater markets can have (Casey and Nelson, 2012, Garduno and Foster, 2010), there are only a few organised functioning markets.