How likely is it I would be able to recover fee's and collect on damages from a plumber?

We've been having the septic pumped every five years. After he came out and told us the field was bad we okayed the work. Two months later the tank was flooded. There was heavy rain, but history tells logic that this shouldn't have been this big of a problem. We had to hire another company to come pump it and it refilled within 15 minutes coming from the drain field, not the house. It's been a nightmare getting the plumber to come back to look at the problem and he seems reluctant to blame the obvious. Do I have grounds to take them to court for damages?