Landlord or tenant- who is repsonsible for emptying Septic tank?

[Daniel Gallardo]

I am creating our lease for our property that has a septic tank.  I know as a landlord we are responsible for the maintenance of the system, but who is typically required to maintain the emptying of it (assuming we start the lease with it empty for the tenants)?  Would this be considered a "utility" or should we just take care of it?  Thank you for any advice!