Israels national cyber chief Yigal Unna officially confirmed that the country had thwarted a major cyber attack against its water systems in April. Unna did not explicitly attribute the attack to Iran, he only warned of unpredictable developments of an ongoing stealth Information warfare. The media, citing officials that spoke under condition of anonymity, attributed the synchronized and organized attack to the Government of Teheran. Israel and Iran are engaged in a covert cyber dispute and recently also hit critical infrastructure or both countries.”]
Source: https://securityaffairs.co/wordpress/103938/cyber-crime/israel-water-facilities-attacks.html