Chin Hung Engineering Company Limited

戩鴻水務工程有限公司

Chun Sing Water Maintenance Limited

駿勝水務有限公司

Hung Fat Plumbing & Engineering Company

洪發水喉工程

Lam Chi Kee Plumbing Drainage Eng., Co.

林智記水喉渠務工程公司

On Tai Waterworks Engineering Company Limited

安泰水務工程有限公司

Shun Hing Water Works Engineering (HK) Limited

順興水務工程有限公司

Tin Wai Plumbing & Engineering Company Limited

天偉水喉工程有限公司