Will Plumbing Work Without Power?

Yes, partially. Most gravity drains and standard toilets still work, but systems relying on electricity or pumps will stop. 

During a power outage, standard sinks and toilets usually function normally. If you are on municipal water, gravity still handles the drainage.

However, homes with well pumps will lose water pressure entirely.

Other systems that will fail include sump pumps, sewage ejector pumps, and electric water heaters. If your basement bathroom relies on a pump, avoid using it to prevent sewage backups.

Yes, if you have municipal water and the toilet doesn't need an ejector pump.

No. It requires power unless you have a backup generator.