Although these examples make good press ("oh no, not again!"), they do little to reduce such waste.
Here's how to reduce that waste: Charge them.
I am pretty sure that many branches of government are not billed for their water use when water supply comes from a public agency. That's because accountants figure that it's not "efficient" to take a payment from one branch of government and give it to another (like shifting money around your pockets).
Of course, such a policy means that there's no incentive to conserve water.*
If, OTOH, the Department of Parks and Recreation had to pay for water as a line-item on its budget, it would pay a lot more attention to how much water (money) it was wasting. That's because more money for water means less money for donuts, staff retreats and other "morale boosters" that our public servants appear to need.
Bottom Line: A bureaucrat's world revolves around his budget. If you want him to do something, make it budget relevant. Bureaucrats will conserve water when it
* The same is true about property taxes, auto registrations, and other government services that are consumed by other branches of government as well as the public. If it's "free," demand is greater!