Education Report

Haig Demergian, PE, CPD, FASPE
Chairman Education Committee
February 2018

WPC Research Data Base

World Plumbing Council (WPC) announced that the Research Data Base is available on website, for review by interested parties.

WPC is an international organization formed to promote word wide, the new research and accomplishments of new technologies of plumbing industry. The main reason for this program is to inform interested parties of the ongoing research and the results of new technologies applied to various plumbing issues. This program will help researchers to know what projects are already completed and what other projects are still in the testing phase. It is evident that this program will reduce duplication of the research efforts.

In the past the same research was done simultaneous in different Countries without the knowledge of the research under way in another Country.

This Data Research Base will provide information of various research projects across the world. To review this Research Data Base, visit WPC home page, and click on “Research”.



One Member’s Opinion
Legionella and Plumbing Systems


Legionella Pneunofilla is a serious respiratory disease caused by a bacteria called Legionella. This bacteria is very diversified and can multiply exponentially in many areas of building plumbing water systems: hot and cold potable water, storage tanks, water heaters, expansion tanks, cooling towers, dead ends of piping systems, water filters, aerators, ice machines,  hot tubs, ornamental fountains, occasional used  fixtures, etc. Center for the Disease Control (CDC) reports that about 5,000 cases of Legionella disease are reported each year in USA. Some of them are fatal, especially affecting older persons with immune deficiency.


Ohio prison:

An Ohio prison restricted showering, distributed bottle water and installed filters on faucets, after two inmates were diagnosed with Legionella disease.

Memphis Hotel:

Nine cases of Legionella disease have been identified on guests who stayed at the hotel. Appears that the disease was acquired by guests who used the pool and/or  hot tubs.

Flushing New York:

Fifteen cases of Legionalla disease were identified. NYC Health Department investigators, tested all the cooling towers and ordered disinfection of the ones in which Legionella was found.

New York City assisted living facility:

Five residents were diagnosed with Legionella disease. All five recovered without hospitalization.  Additional chemicals were added to cooling towers.

World wide:

Many other outbreaks of Legionella disease are reported from almost any country in the world.

Note:  These examples of Legionella outbreaks are excepts from “Legionella eNews” a free newsletter available at

Municipal water supplied in USA, by various purveyors as “potable water” contains, after all the treatments, some residual bacteria and various dissolved minerals, allowed based upon definition of EPA of  “potable water”. To prevent multiplication of bacteria in municipal water piping and building piping systems, small amount of chlorine or chloramines is added. Unfortunately these added chemicals are unstable, and their effect is reduced, especially when the water is heated. The result is that Legionella is multiplying in plumbing potable water piping systems. This will affect people who will inhale during showering, small droplets of this polluted water.

WMP (Water management Plan).

ANSI/ASHRAE Standard 188-2015 requires that all commercial  buildings, except single family, shall have a WMP. The Standard covers in detail the type of records and tests, the owner should keep. But doesn’t give any construction suggestions on how to install plumbing piping system to allow the owner to perform all tests and consequent disinfections required.

On your next plumbing project for a multi story building, I suggest you  read my articles published in ASPELA News of March 2017 stating on page 11, and article  published in ASPELA News of December 2017 starting on page 11. You will find a  lot of information regarding bacteria in general, and Legionella bacteria in detail.

I believe that this complex task will require a new approach for designing potable water systems. ASPE should organize a group of engineers/designers, contractors, and manufacturers and a microbiologist, and offer a new design approach for plumbing  systems design, taking in consideration new criteria.