Presuming you have electric baseboard heat or something like that. That's fine in a pinch, but heating that way all winter will be very expensive.

Gas is generally the cheapest way to heat overall taking into account the upfront cost of the system and maintenance. Heat pumps, especially split systems, are very good, but less ideal for houses in the colder parts of PA.

Water / sewer varies widely, but doubt that's where the issue is. If it is, look at the bill carefully. If the usage seems way off, could be a leaky pipe pass the meter and/or the meter is faulty.

Without more detail, all anyone here can do is speculate. Hope you figure it out, since that amount is double or more what many pay.