Look into an Aqua Klear system if you run into problems. Just needs 120 VAC to an air pump and a hole in the ground to put the tank. Processes the septic well enough that you can use it for irrigation.
Down here one of those or similar is required if you are in CZM (Coastal Zone Management, basically within 1 mile of the shore) We put one in so we could use all our waste water, (toilets, shower, sink, washing machine etc) for irrigation even though we are more than 1 mile form the shore. Given how dry it has been we are glad we went that route. Pretty inexpensive, of course we decided to go with this system from the beginning so no refitting.
i have no idea what a perc test is, is it something to make sure your coffee maker is up to snuff????
after having our Aqua Klear I can not figure why anyone would use an old fashioned septic system.