Worlwide statistics about population connected with seewage cleaning are available country by country. You will see that Israel is not too bad. Regarding discharge of heavy metals into the sea, first find out what the other side really are doing, i.e., the industry and the "Government" in Israel. All figures regarding wordlwide pollution are available. Stop bashing Israel and jews and go and find out first.
5 wounded Syrians rushed to northern Israeli hospital (Haaretz)
from the article: Study: Israel is biggest polluter in eastern Mediterranean