Multifamily - Septic

[Devon Moore]

Hi!

I am currently looking at a duplex in New Hampshire with a septic system. I like the property because it has a great potential to add a second 1 bedroom unit. One unit is a 3 bedroom house with two bathrooms. The second unit is a 1-bedroom apartment with one bathroom. The septic tank is 2,500 gallons. Would this be a sufficient size to add another 1bed/1bath apartment to?

Thanks for any insight!

Devon