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Yes, and no. Your shower, toilet, and sink all connect to the same main drain, but the secondary drains going from each fixture to the main drain are usually separate. This isn’t always the case—especially in older homes—but since toilets contain black water and showers, tubs, and sinks have grey water, toilets are more regulated and come at a greater risk of contamination. It’s best to keep these drains separate using individual waste collection for this reason.

You generally cannot replace a 10-inch rough-in toilet with a 12-inch model without making significant plumbing updates. A 12-inch rough-in toilet will not fit a 10-inch rough-in space because the floor drain is in the wrong position. To accommodate the larger toilet, you would need to move the drainpipe, which could cost between $0.75 and $30 per linear foot, plus labor. In most cases, it is more cost-effective and simpler to purchase a new 10-inch rough-in toilet. However, it is possible to install a 10-inch rough-in toilet in a 12-inch space by using a longer connector.

The lifespan of a toilet can vary significantly. While the porcelain body itself can last up to 50 years or more with proper care, most plumbers suggest an average functional lifespan of 10 to 25 years, and many homeowners replace their toilets after about 20 years.

A toilet's longevity is influenced by factors like maintenance quality, hard water buildup, and damage to the finish. It's also important to note that internal components have much shorter lifespans than the bowl; for example, flappers may last only a few years, while fill valves can last around 10 years.

Even if an older toilet is still functional, consider upgrading to a high-efficiency model to save on water costs.

Yes, you can have a toilet without a septic tank. However, it will have to be a composting toilet. Composting toilets work similarly to aerobic septic systems in that the waste, which sits in a separate compartment below the toilet itself, is slowly broken down by aerobic bacteria. These toilets typically have a vent to get rid of harmful gasses with a fan, which requires a battery. You will have to dispose of waste in the toilet manually every three weeks to every three months, depending on how many people are using the toilet.