Protection of publc water supply

[Mac]

Some water softener units are scheduled to be installed in 10 - 14 unit apartment buildings. Haven't seen the equipment yet. I quoted the NYS Plumbing Code sec. 608.3 "Devices, appurtenances etc":

"608.3 Devices, appurtenances, appliances and apparatus. All devices, appurtenances, appliances and apparatus intended to serve some special function, such as sterilization, distillation, processing, cooling, or storage of ice or foods, and that connect to the water supply system, shall be provided with protection against backflow and contamination of the water supply system. Water pumps, filters, softeners, tanks and all other appliances and devices that handle or treat potable water shall be protected against contamination."

When I mentioned the need for a vacuum breaker or other public water supply protection, there was much wailing & gnashing of teeth, including the old "we don't need to do that anywhere else" card.

Does the public water system need protection from the softeners, and is a vacuum breaker appropriate protection? What is commonly done in your jurisdiction?

 

[fatboy]

I say yes to the first, and the vacuum breaker may be OK, depending on the location. Needs to be above grade, 18" I believe.

 

[RJJ]

The back flush should be separated and it depends on the type of system.

If the building water service has back flow protection than it is not a big deal. IMO

 

[Dr. J]

Does the potable water system need to be protected from a potable water softener that serves the potable water system? No.

“Water pumps, filters, softeners, tanks and all other appliances and devices that handle or treat potable water shall be protected against contamination."

This means the brine tank needs a tight fitting cover to keep the rats and bugs out.

Yes, an air gap is required between the backflush outlet and a waste receptor.

 

[Mac]

That last line of the code, "Water pumps etc" was not clearly requiring the water supply protection. Now I understand it better, and will get air gaps at the discharges. I am waiting for manufacturere's literature which will help.

Thanks all!

 

[Dr. J]

"...and will get air gaps at the discharges"

I assume you mean the backwash discharge to the floor drain will have an air gap. Can't have an air gap at the potable water discharge.