The Chief Rabbinate has asked the public to say special prayers for rain. I’m not going to do that.
First of all, all traditional Jews in Israel are already asking for rain from Ram Cheshvan 7, trice every workday.
Special prayers for rain are said in case of a life-threatening drought. However, we should also be very careful not to add to standard prayers needlessly, just at any occasion. Not only because that’s hardship for the worshipers. It’s also a denigration of the Men of the Great Assembly who composed our daily prayers thus that they are fit for any occasion.
So there is no such thing here as “it can’t do any harm and it may do some good.” But there is more.
Would the Chief Rabbis call upon the public to pray against shoplifting? No. Why not? Because that’s not in the hands of G^d. It would implore the police to be more vigilant.
Likewise, the State religious leaders should ask municipalities to fine people who “sweep” the street with their block’s fire hose. Neighborhoods with too many violators should have their water cut off a couple of hours a day. They should call upon people to take care of their leaking toilets. Households with the most water usage per inhabitant should be inspected. This all is not under G^d’s control; He appointed us.
Now, it is possible that the Chief Rabbis asked this because we have such prayers from the times that drought could expel us from the Land. But nowadays, the government just buys water when there is a shortage, as it did already last month. That means that wasting water just is thievery from everyone’s wallet. We don’t pray against that – we send the police.
Last but not least, desalination plants must be built with foresight. Some have been built already and some not. On that we also do not beseech the L^rd of the Universe.
As long as water comes out of the tap and people waste water all day long, no special prayers for more rain should be said.