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Phillip Clisham, specialist adviser to the Institution of Civil Engineers on water and sanitation, has worked in the industry for more than three decades, and said the challenge of fixing the issue has been "underestimated".

An estimated 70% of buildings have been damaged or destroyed in Gaza, healthcare, water and sanitation systems have collapsed and there are shortages of food, fuel, medicine and shelter.

Representatives of several city unions — including police officers, firefighters and sanitation workers — either declined to comment or did not immediately respond.

An estimated 70% of buildings have been damaged or destroyed, healthcare, water, and sanitation systems have collapsed and there are shortages of food, fuel, medicine and shelter.

Water sanitation projects in the camps used to be funded by USAID.