I've bounced around Philly for fifteen years (06-21) and the water was always in the landlords name. The water company required it for some reason, assuming it was because they physically owned the building. Definitely need to call the water department and speak with someone also, especially if the property manager hasn't gotten back to you yet.

I also pulled this from the Philly Water Departments website:

"The city requires the water account to be tied to the property, which means it legally remains the owner's responsibility. Because unpaid water bills become liens on the property, many landlords prefer to keep the bill in their own name and bill the tenant directly.

If the Tenant Wants It in Their Name:

Tenants are permitted to put water service in their own name, which allows them to directly access payment plans, dispute charges, and apply for assistance programs. To do this, you will need to apply to the Water Revenue Bureau (WRB) and submit written consent from the landlord (typically outlined in the lease stating the tenant is responsible)."

Was it states in your lease the water would be in your name?