Before the Israeli blockade of the Gaza Strip was imposed in 2007, several repair works were under way to improve sanitation in the area.
But the projects have been on hold under the siege, as Israel is preventing repair materials from coming into the Strip.
The United Nations says the water system in Gaza is on the verge of collapse.
Al Jazeera's Sherine Tadros, reporting from Gaza, explains how overworked and outdated pipelines are polluting the water and making Palestinians ill.
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