Water Hygiene Engineer Jobs London – Legionella & L8 Vacancies

London has the highest concentration of L8 legionella risk assessment and water hygiene compliance work in the UK. The capital's density of NHS acute hospital trusts — including UCLH, King's College Hospital, St Thomas', and the Imperial College Healthcare NHS Trust — creates continuous demand for water hygiene engineers who can manage complex hot and cold water systems, cooling towers, and spa pools under ACoP L8 and HSG274. Hospital water systems require monthly monitoring, annual risk assessments, and immediate response to positive Legionella samples, making these roles technically demanding but well-remunerated.

London's data centre sector adds another significant dimension to water hygiene demand. Facilities operated by Digital Realty, Equinix, CyrusOne, and others use large water-cooled chiller plant and cooling towers that require stringent biocide dosing regimes and routine microbiological testing. Engineers with City & Guilds 6084 or BOHS P901 certification and experience in cooling system management are particularly sought after for these roles. London salaries for water hygiene engineers carry a 20–25% premium: expect £36,000–£55,000 for experienced engineers versus £28,000–£42,000 nationally.

Key London employers in water hygiene include Mitie Water, Hydro-X Water Treatment, Aquatech, Hi-Lo Water Treatment, and BWS Water Hygiene Solutions. Many also subcontract work to specialist water hygiene companies, providing a strong market for self-employed engineers holding their own BOHS P901 or equivalent.

See our UK FM salary guide for full regional benchmarks and legionella engineer career progression data.