I have been playing cities skylines for a while now and every now and again my city goes through the 'plague', where pretty much the entire city falls sick (see image below).

My water pollution is 0% and have more than sufficient crematoriums to accommodate the dead.

A few google searches point to water pollution but that is not the issue here... Any ideas what could be going on?

enter image description here

  • 2
    This might seem dumb, but you do have ample hospital coverage? Also your screenshot shows quite a few dead, maybe your crematoriums' hearses are having problems getting to your dead. Doesn't matter how much space you have if it takes a long time for pickup.
    – user66184
    Apr 8, 2015 at 21:06
  • 1
    Yup, ample hospital coverage. This 'event' only happens intermittently though, its not constant.
    – Harpal
    Apr 8, 2015 at 21:08
  • 1
    Did you have (several) population booms? As in, did you build nearly an entire section or residential while paused and then let them populate? This could be a symptom of that, nearly everyone who moved in dying of old age at the same time. Apr 8, 2015 at 21:28
  • 3
    Well, that escalated quickly.
    – TZHX
    Apr 8, 2015 at 21:56
  • 1
    The major problem you might have in your city is traffic. There might be plenty of deathcare coverage but if the traffic is heavy, they won't be able to pick up the deaths in a timely manner. Apr 9, 2015 at 12:03

1 Answer 1


Based upon information from online threads and in-game experience it appears that citizens will die at specified intervals based upon when the residential zone was created. There appears to be a few ways to combat this:

  • Make sure not to zone in large bursts. Meaning that you should zone a few sections of residential as time goes on and not in one large block while paused.
  • Ensure that you have plenty of Crematoriums and Graveyards that can easily access all areas of your residential zones.

Sources: first, second, third, fourth

  • Since I could only post 2 sources in my OP here are a few more with similar information: 1, 2 Apr 9, 2015 at 8:27
  • To add to this answer, check your city's Death and Population statistics. If the answer applies to your situation, you will see the line fluctuating wildly.
    – Thorsal
    Apr 9, 2015 at 13:16
  • 1
    This seems like the answer. It does kind of stink that I need to have 30 crematoriums in my city of 80,000 to handle these spikes. The game is off a bit in this respect.
    – Bob
    Apr 14, 2015 at 16:46
  • @Bob you don't need 30. But if 80% of those 80k die at the same time because you invited them to your city at the same time, then you have to handle that. As already said above, increase your pupulation in intervals, then you may need maybe a max of 10 crematoriums for 80k.
    – Magier
    Dec 23, 2015 at 14:07

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