Some municipalities discourage residential garbage disposers because of inadequate sewer systems or water supplies. Even if your community allows disposers, using one may cost you more than you think. Before buying a disposer, answer these questions:
If you use a municipal sewer system, call your local sewer authority to find out its disposer policy. Some require a permit to use one, while others discourage them because of limited water and sewer capacity.
Your municipality may require an upgrade if you use a garbage disposer. Consult the local building inspector or environmental health official. Alternatively, you may need to empty the existing tank more frequently.
Don't install a garbage disposer if plumbing clogs or backups are frequent, since a disposer's added waste can make both more likely. Have a problem septic system fixed, emptied, or enlarged before buying a garbage disposer.
Figure on roughly 2 gallons of water per minute for most sinks, or about 700 gallons per year based on minute-per-day use. Besides potentially increasing your water bill, a disposer's added consumption is a concern in drought areas.