Forgive my ignorance and curiosity - but why is your father's pay not steady if he works in a municipality? If he works at a Muncipality, it should mean he work

Forgive my ignorance and curiosity - but why is your father's pay not steady if he works in a municipality? If he works at a Muncipality, it should mean he works for the government, and everywhere in the world government jobs pay may be low but it is supposed to be steady with good job security?