According to the Palestinian Water Authority, which monitors nitrate concentration in 211 municipal wells, 87% of the wells have nitrate levels that exceed the WHO limit of 50 mg/L, with concentrations of over 200 mg/L in some places. Nitrate pollution is difficult to spot, since it is colourless, tasteless and odourless. This makes it all the more dangerous, as people often keep using water with high nitrate levels until they are told about the health risks. Nitrate and chloride concentration in groundwater in the Gaza Strip and amount of water suitable for human consumption. Together, the pollution by nitrates and chloride render almost all of Gaza’s water unfit for human consumption. According to the Palestinian Water Authority, in 2014 less than 4% of the domestic water supply was fit for human consumption.