Your recommended action is to contact your landlord or real estate agent immediately for assistance. Your real estate agent may need a little more information about the specific unit you have, so see if you can find all this out when you contact them. Photos can be a very handy tool.
If it's an emergency, such as a burst tank, or leaking water, you may be able to have it taken care of as an emergency repair. Make sure you understand what you can and can't do in your state when it comes to emergency repair work, and what is classified as an emergency repair. Refer to your local Residential Tenancy Authority for more information.