The 10th International Conference on Legionella 2022

Registration System of Anti-Legionella Chemicals andResults of External Quality Assessment for Legionella Testing
Masakazu Hayashi, Takayuki Baba, Takanari Kume, Makoto Horiike, Koh Matsunaga, Tsuyoshi Kanoh, and Hiroaki Inoue
The Japan Association of Anti-Legionella Chemicals for Cooling Water

About usThe Japan Association of Anti-Legionella Chemicals for Cooling Water was established in 1991 by private water treatmentcompanies in Japan to supply effective, highly safe anti-Legionella chemicals and disseminate correct information about
PicoGene environmental Legionella contamination. Main efforts of Our Association are enlightenment activities to prevent Legionnaires’
PCR1100
disease, maintaining a registration system of effective water treatment chemicals against Legionella submitted by member
companies, and improved accuracy of Legionella testing.

Member Companies
AQUAS CORPORATIONKATAYAMA NALCO INC..

Kurita Water Industries Ltd.

Koei Chemical.

Gospel ・Toshin Ltd.

ORGANO CORPORATIONDIA AQUA SOLUTIONS CO., INC.

NAIGAI CHEMICALPRODUCTS CO., LTD.

Tohzai Chemical Industry Co., Ltd.

NIHON JOUKA CHEMICAL Co., Ltd.

MARUSAN Chemical Industrial Co., Ltd.

Hakuto Co., Ltd.

Showa Industries Co., Ltd.

SANYO KAKO CO.,LTDSwing Corporation

Mitsubishi Chemical
Aqua Solutions Co., Ltd.

Miura Co., Ltd.

Enlightenment Activities to Prevent Legionnaires’ Disease
We have published “Guidance on Prevention of Legionnaires'
Disease in Cooling Water Systems” for cooling tower managers andhave distributed it since 2001.
We also provide information on Legionnaires' disease prevention on
our website and conduct enlightenment activities to prevent
Guidance on Prevention ofLegionnaires' Disease inLegionnaires' disease in cooling water systems.
Cooling Water Systems

Our Website (https://www.legikyo.gr.jp/)

Registration System of Anti-Legionella Chemicals
Requirements for Registration

Use of registered antiLegionella chemicals
is effective in inhibiting
Legionella growth incooling water systems

 Efficacy against Legionella(Testing for in vitro, and using a cooling tower) Safety in humans(Skin irritation test on animals)
Water treatment chemicals can be registered as ananti-Legionella chemicals by submitting these datato us.
Current number of registered chemicals: 174 items≥100 CFU/100 mL Detected samples（%）

30

No treatment

25201510Treatment with registered anti-Legionella chemicals

502011

2012

2013

2014

2015

2016year

2017

2018

2019

2020

2021

The number ofsamples analyzed
in each year ismore than 10000

Efficacy of the treatment with anti-Legionella chemicals

Participation in External Quality Assessment for Legionella Testing
We have been working to standardize Legionella testing methods in cooling tower waters to improve Legionella testing by
each member company. Since 2013, we have participated in the external quality assessment (EQA) for Legionella testing
established by the UK Health Security Agency.
4.00
3.00

Review of testing method

The green line shows the average value of Z score

2.00

We certify participatingcompanies that satisfy therequirements for EQA.

Z score

1.00
0.00
-1.00
-2.00
-3.00
-4.00

year

Certificate of Participationin EQA of UK HSA.

Change in Z-scores of participating companies

Certified companies may
display this mark on test
reports and otherdocuments.