Pumps, filters, chlorination, etc. all need to be maintaine.
But Marx, Lenin, Mao, Fidel, Che and Hugo never talked about maintenance and repairs so they must not be needed. The problems are coming from right wing sabotage. /s
And each has a cost. As society collapses, the costs go up as fuel and/or electricity becomes more expensive due to inflation. Eventually the funding provided to keep these basic services in place is not enough. Then the system begins to break down.