a tree with green grass and trees
Who we are

Established in 1998, we are Hong Kong’s leading liquid waste management company, with business lines including portable toilets, sewage management, and mechanical street cleaning.  We manage a fleet of more than 80 specialized vehicles and employ more than 220 professionals.  

With a track record of more than 20 years of serving customers from commercial, government, and events management segments, we help transform the sanitation business through providing innovative and eco-friendly solutions to customers, and by proving best-in-class service.

In January 2022, ESS was acquired by ADV Partners, a regional Asia Pacific focused private equity fund. ESS was formerly known as ISS Environmental Services (HK) Limited and was a 100% owned subsidiary of ISS Facility Services Ltd. (Hong Kong), an indirect subsidiary of ISS A/S, a global leader in facilities management solutions, listed on the Copenhagen Stock Exchange.

Our predecessor businesses included Reliance Environmental Services, a cleaning and environmental services business, which ISS acquired in 1998 from Jardine Pacific, and Environmental Services (ESGO), a large cleaning and facilities management business founded by AB Electrolux, and acquired by ISS in 1995.


We take pride in providing essential services for our communities to safeguard public health and hygiene. We strive to improve the cleanliness and sustainability of the environment through our integrated liquid waste management and customized sanitation solutions.

Our values

Caring for our people

Our people are our most valuable asset and their health and safety is our utmost priority. At ESS, we seek to provide a stable environment for our employees with job security and career development opportunities, including specialized training and skills upgrading.

Going the extra mile

We strive as a team to do our best every day. Across the organization, we are empowered to do what is right, look after our community, and care for current and future generations. Our customers value us for service reliability, emergency support capabilities, and the ability to provide service in remote locations.

Improving the environment

We care for the environment. We constantly seek to improve while ensuring our solutions are in harmony with the surroundings. This includes advancing hygiene standards in our national parks, offering eco-friendly sanitation facilities, and investing in facilities that provide additional comfort.



Established as part of ISS Facility Services


Renamed ISS Environmental Services (HK) Limited


Awarded the first mechanical street sweeping cleansing contract with Food and Environmental Hygiene Department (“FEHD”)


Participated in the Equestrian Events of the Olympic Games by providing our customized container toilet and associated services


Awarded the desludging and mid-night conservancy services contract with FEHD


Awarded the mechanical gully cleansing services contract with FEHD


Completed stainless steel prefabricated customer service kiosk in Tai Lam Public Transport Interchange


Commenced our tailor-made container toilet service in The High Island Reservoir East Dam


Launched our solar toilet service, with our first solar toilet deployed in Tai Tam Country Park


Commenced our tailor-made container toilet service in the Lok Ma Chau Public Transport Interchange


Acquired by ADV Partners and renamed Environmental Services Solutions Limited (ESS)

Latest news

ADV Partners acquires 100% of ISS Environmental Services (HK) Limited

February 9, 2022