Please make sure that a permit was taken out and all inspections were signed off by the municipal septic inspector. Here in PA we have an SEO Sewage Enforcement Officer who is an extension of the PA DEP. The job of the SEO is to approve and oversee the installation.
Don't think that an inspection is a waste because even under these circumstance we have found very bad problems that had to be correct because they were causing or were going to cause a failure.
Not all SEO's are alike and some may still be playing the "Good Ol'e Boys" club and not take his/her job seriously.
A home should be lived in for 30 days full time occupancy before a good evaluation can take place. If you inspectors only do a "dye test" which is a joke, then don't bother having them look at it at all.
See this link for information on dye tests.
http://psma.net/dye_tests.html