Speaking to reporters in Geneva, Staffan de Mistura said he was concerned that fighting northwest of Damascus that has cut off the capital's clean water supply would further escalate and derail proposed negotiations between the government and the opposition in Astana, Kazakhstan, later this month.
The talks are sponsored by Russia and Turkey, which support opposing sides of the Syrian civil war. But the status of the meeting, planned for January 23, is not clear.
The UN says the capital has suffered from a water shortage affecting 5.5 million consumers since December 22.
The leader of one of Syria's largest rebel factions, the ultraconservative Ahrar al-Sham, said in remarks aired today that the violence in the valley and daily airstrikes on rebel-held areas "are signs of a collapsing truce."
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De Mistura said five villages in the Wadi Barada area have reached an "arrangement" with the government, but two villages, including one which holds the source of water, al-Fijeh, have not.
He also said the cease-fire, which came into effect December 30, should widen humanitarian access to besieged areas, but that "unfortunately, that is not the case."
The opposition-run Syrian Civil Defense, a search and rescue group also known as the White Helmets, said its workers pulled the bodies of three children and three adults from the rubble of an airstrike on the village of Babka in the opposition-held countryside west of the once-contested city of Aleppo.
The US is believed to be behind a series of strikes in the neighboring Idlib province that activists say have killed several Al-Qaida-linked militants.
The Britain-based Syrian Observatory for Human Rights reported four children among the dead.
The raid followed a day of strikes on two opposition pockets outside the capital, Damascus. The strikes on the Ghouta region, where pro-government forces are waging a ground offensive against rebels, were the first since the cease-fire came into effect, according to the Observatory. Another six civilians were killed in an airstrike on the Barada Valley yesterday.
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