"At least 28 water facilities have been damaged by the conflict, affecting water supply to more than 360,000 people, primarily in the south of the country," UNICEF said in a statement.
At least 15 hospitals and 70 primary health care centers have also been damaged in Israeli attacks in different regions of the country, the agency said, adding that six hospitals are currently out of service.
"In areas like Beirut and Mount Lebanon, communities are struggling to meet the growing demand for water, shelter and essential supplies as displaced families continue to arrive seeking safety and support. Based on government figures, 400,000 children are estimated to have been displaced," UNICEF said.
Earlier in the day, UN Special Coordinator for Lebanon Jeanine Hennis-Plasschaert confirmed that Israeli strikes were targeting civilian infrastructure in all parts of the country.
On Wednesday, the Lebanese Foreign Ministry said that the Permanent Mission of Lebanon to the UN had filed a complaint with the UN Security Council regarding ongoing Israeli strikes on civilian infrastructure facilities.
On October 1, Israel launched a ground operation against the Hezbollah movement in the south of Lebanon. Israel says its main objective is to create conditions for the return of 60,000 people displaced in its north as a result of Hezbollah's attacks, which the Shia movement launched in response to Israeli aggression against the Gaza Strip last year.