Yes they are government. Citibank have every right not to aware points on these bills.WATER RATES are they:
But each local government would be treated differently as this is all dependant on the entity data with their credt card merchants. Some might be properly categorised and others wont. So if one LG entity still manages to earn points, it doesnt mean others will, or that this is sustainable.
All you can do is continue paying your water bill and stop when you notice it no longer gives you points, stop and change cards. Or just pay them with a card that you know will credit the points.