Probably unlikely…when and where was the last time that you filled up?
Might be worth having a read of
http://customerhelp.thameswater.co.uk/app/answers/detail/a_id/406/~/why-might-my-water-be-black-or-have-black-particles-in-it%3F
Could be worth draining the sytem and flushing out any “old water”
