I would try asking those in your area who also have a septic system. They have probably had problems with their septic system as well and will know who to hire. I think this will end up helping you find exactly what you need and who you should hire. I would definitely recommend calling those in your area for recommendations first! http://honeywagonllc.com/septic-repair-cleaning-pumping.html
I suggest searching for a few in your area online. There are plenty of reviews out there you could use to narrow down the search. Once you've settled on a few different companies, you could call and get quotes and choose from there. Good luck in your search! http://www.allcountyoperations.net/Services/
I have a second home that is in a rural location and it needs a septic tank. I often find that it needs service and every time that it does, I am always astounded at how much we rely on that thing. When they come to do the repair, they have to shut it down temporarily and it makes me appreciate it that much more.