Tenant refuses to take trash out

[Rick L.]

I've had a new tenant move in to one of my four family units. The tenants have always internally developed a schedule to roll the large city trash cans from the rear of the building to the street for trash pickup. Typically, it results in each of the four units handling this trash responsibility once per month. However, the new tenant is older and claims to have health issues where she cannot push/pull anything over 15lbs. and cannot do the trash once per month.

Is there anything I'm legally responsible for as landlord? I currently live in one of the units, however I'm leaning towards telling her to work it out with the residents as this isn't a landlord problem. I don't want to be discriminatory or open myself up for a lawsuit. She does work part-time time for the city and has retired as a probation officer. Thoughts?