Legionella risk assessment in Gravesend

Updated 7 September 2026

Gravesend is one of the oldest port towns on the Thames, with the world's oldest surviving cast-iron pier, a working riverside, and a ferry link to Tilbury that has run for centuries. The Guru Nanak Darbar Gurdwara, one of the largest Sikh temples in Europe, reflects the town's diverse community and draws large visitor numbers, while Northfleet's cement works and riverside wharves keep an industrial water-system presence on the doorstep. The town centre's Victorian terraces and the post-war estates inland provide the bulk of the housing, much of it now privately rented, and regeneration along the river at Gravesend and Northfleet is adding new apartment blocks with communal plant.

Local water supply

The mains water supplier for Gravesend is Thames Water (Thames Water website). The mains supply is treated and controlled by the supplier, so your legionella duties begin where the water enters your premises. Anything downstream of the boundary stop tap (storage tanks, calorifiers, pipework, outlets) is your responsibility.

Water in the Gravesend area is classed as Very hard on the Drinking Water Inspectorate hardness scale (around 310 mg/l as CaCO₃), according to WaterGrade water quality data (single source - unverified). Harder water lays down scale inside calorifiers, cylinders, and mixing valves, and scale gives legionella a foothold while blunting temperature control, so in hard-water areas descaling and inspection belong in the written scheme of control. Check your supplier's postcode water-quality checker for the figure for your exact supply zone.

Legionnaires' disease in the South East

The most recent regional surveillance figures recorded 100 confirmed cases of legionellosis in the South East in 2023.

These are the confirmed figures UKHSA states explicitly; a full region-by-region table is not published, and surveillance counts only laboratory-confirmed, reported cases, so they are a floor rather than the true total. The national picture, with the trend since 2017, is on the Legionella Data Index. The regional figure changes nothing about your own duties: whatever the count, a non-domestic water system in Gravesend still needs a risk assessment, a control scheme, and the records to show the scheme is being followed.

Typical cost in Gravesend

Legionella risk assessment costs in Gravesend depend more on the water system than on the location. A rough guide:

• Small premises, mains-fed only, no storage: £150 to £250
• Typical office or shop with a hot water cylinder: £200 to £400
• Care home, hotel, or school with stored hot and cold water: £400 to £800
• Premises with a cooling tower or evaporative condenser: from £800, often much higher

Cooling towers drive the cost up because they are notifiable to the local authority under the Notification of Cooling Towers and Evaporative Condensers Regulations 1992, and they need quarterly sampling and extensive cleaning. Get a tailored estimate with our cost calculator.

Legionella enforcement in the South East England

Prosecutions for legionella failings are usually brought under the Health and Safety at Work etc. Act 1974, whether by the HSE, a local authority, or (in Scotland) the Crown Office and Procurator Fiscal Service. No case in our tracker is recorded in Gravesend itself; the cases below are the most recent recorded elsewhere in the South East England, shown as regional context rather than local history. They are drawn from our legionella enforcement tracker, which records each one against its primary source:

Sentinel Health Care Limited, 2020 (Care home) — fined £150k. A 56-year-old resident died of Legionnaires' disease contracted at a Hampshire care home in 2020. In the CQC's first legionella prosecution, the company admitted failing to provide safe care and treatment.

Reading Borough Council, 2016 (Care home) — fined £100k. A 95-year-old resident died in 2012 of legionella pneumonia at a council-run intermediate-care home, where the strain in his room's washbasin tap matched his infection. Monitoring and flushing had been left to an inadequately trained handyman with no cover.

The failings behind these cases are consistent: no suitable risk assessment, no written scheme of control, monitoring not carried out, or records that could not show the controls happened. The full dataset is on the enforcement tracker, and legionella fines and prosecutions explains how the courts approach sentencing.

Find a legionella risk assessor in Gravesend

We are building a directory of qualified water hygiene assessors in Gravesend and across the UK. In the meantime, look for assessors who:

• Work for a company registered with the Legionella Control Association (the LCA is the main UK trade body for water hygiene)
• Hold a City & Guilds or equivalent qualification in legionella risk assessment
• Can provide references from similar premises in the Gravesend area
• Will quote against a clear scope (number of outlets, inclusion of hot and cold surveys, whether sampling is included)

Legionella testing labs covering Gravesend

Routine temperature monitoring is done on site, but where your risk assessment or written scheme calls for water sampling, the samples go to a laboratory for culture. These UKAS-accredited laboratories cover Gravesend and accept posted samples:

• South East Laboratories Limited (UKAS no. 9856), turnaround 24-hour turnaround advertised (express); standard culture turnaround not published
• Normec Latis Scientific Ltd (UKAS no. 2279)
• Alpha Scientific Limited (trading as Alpha Scientific / ADEY) (UKAS no. 7620)

Methods, turnaround times and published prices for the full directory are compared on the legionella testing labs page. Sampling is not a substitute for day-to-day control: a clear result records what was found at that outlet on that day, it never certifies a system as safe, and it sits alongside the routine checks in your written scheme of control, not instead of them.

Building types in Gravesend

Different building types have specific legionella considerations. Browse the guides most relevant to Gravesend premises:

• Landlords and rental properties
• Offices
• Care homes
• Hotels
• Schools
• Dental practices
• All building types