Thread: Anyone familiar with plumbing code in Boston?

Does anyone know if the City of Boston requires an air gap on a dishwasher drain line?

Dishwasher is connected to the disposal with a plastic hose that snakes across the bottom of the cabinet before rising to the disposal. There is no air gap, nor is the drain line higher than the disposal at any point. The dishwasher apparently back-siphoned, then flooded the floor. Any idea how or why the water escaped from the DW compartment?

Originally Posted by William Reilly

Does anyone know if the City of Boston requires an air gap on a dishwasher drain line?

Dishwasher is connected to the disposal with a plastic hose that snakes across the bottom of the cabinet before rising to the disposal. There is no air gap, nor is the drain line higher than the disposal at any point. The dishwasher apparently back-siphoned, then flooded the floor. Any idea how or why the water escaped from the DW compartment?

I don't know about Boston requirements
However, 2006 IRC (most all of the USA) only require an air break on a DW, not air gap.
The DW drain line should have been attached to the underside of the cabinet.
It's not very likely that the DW back siphoned that much water.
For the DW to back siphon, the disposal drain line would need to be stopped up.
More likely that the DW overfilled.
There is a round dome shape float switch on the floor of the DW tub.
Sometimes something will hold the switch down.

Originally Posted by William Reilly

Does anyone know if the City of Boston requires an air gap on a dishwasher drain line?

Dishwasher is connected to the disposal with a plastic hose that snakes across the bottom of the cabinet before rising to the disposal. There is no air gap, nor is the drain line higher than the disposal at any point. The dishwasher apparently back-siphoned, then flooded the floor. Any idea how or why the water escaped from the DW compartment?

Most municipalities post amendments to code requirements on their website.