Cesspool to Septic rules in NJ

[J. Spring]

Hi all! I just bought a property in New Jersey and it was a bank-owned foreclosure. I was aware that there was a cesspool rather than a septic system at this prior to purchase. That's part of the reason that the price was so good. We're going to have a surveyor and an engineer draw up plans for the septic system but I'm wondering if anyone has ever tried to install it themselves? Apparently this is legal but I'd like to confirm it. 

Anyone know of any resources regarding the laws for septic systems in New Jersey as well as information about installing it yourself?