Yea, where is/are the meter(s)? If they are downstream of the leak then its likely the water companies issue. if you all share a meter and its before the leak then you would likely pay and then ask those that share the pipe to chip in, if they don't pay then just write it off as u being a nice guy. If the water can be shut off ahead of the leak easily then the repair would only cost 1 hour of a plumbers time, under $10 in parts plus whatever show up at your door charge they may have. All told I wouldn't expect the repair to be over $200, and likely significantly less, unless something went wrong or there are more bad things beyond just the leak.
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