This can be paid by the year, by month, by week, or by day. A modelling study now underway should determine the natural rate of recharge of the deep aquifer in the south of Luxembourg, which contains waters fit for human consumption. The Water Law requires housing developments to have a separate system. With the exception of artificial water bodies (those created by human activities) or those that have been highly modified (through physical alterations due to human activity). Polychlorinated biphenyls (PCBs) can cause cancers and endocrine disruption.