How many people do you have in your household? If it is more than two it might make sense to hold onto the gas service and have a gas water heater installed. Your electric water heater is probably the largest single use of electricity in your home on an annual basis. It would take some homework to determine if this would be a better deal or not, but probably worth the exercise.
Some of the imputs needed:
Cost of gas water heater and installation (some gas companies will subsidize this to get you to use more gas)
Cost of electricity per KWh.
Cost of gas in your area.
Number of people and water habits in your household (Dishwashing, hotwater laundry, showers, etc)
Another thing to consider if you dry a lot of laundry is a gas clothes dryer.
Websites like this can help you make the comparison:
http://energy.gov/eere/femp/energy-cost-calculator-electric-and-gas-water-heaters-0 This may all seem counter intuitive, spending money to save money, but in many parts of the country, natural gas is WAY cheaper than electric, although natural gas prices are more volatile. I would look for a 2-3 payback period.
Another alternative may be to go ALL electric (heat pump) when your furnace evenutally ages out if your winters are mild and your demands for water are low. Not only will you get rid of the $30/mo altogether, but your power company may give you a discount for being all electric. Somethng to consider if your furnace is 10-15+ years old.
Sorry for complicating things!