Legionella risk assessment in Bristol

Updated 16 August 2026

Bristol combines a large service sector economy with a strong healthcare and university presence, producing steady demand for legionella risk assessments across offices, student housing, NHS and university premises. The city's older Georgian and Victorian housing stock has been widely converted to HMOs and small offices, which typically means retained pipework from multiple renovation eras.

Local water supply

The mains water supplier for Bristol is Bristol Water (Bristol 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.

Bristol Water describes the water it supplies in the Bristol area as moderately hard to very hard — the company's own statement, not a measured town figure, so no mg/l value is published (source: Bristol Water). Water hardness still matters for scale: scale inside calorifiers, cylinders, and mixing valves gives legionella a foothold while blunting temperature control, so descaling and inspection belong in the written scheme of control. Check the supplier's postcode water-quality checker for the figure for your exact supply zone.

Legionnaires' disease: the national picture

UKHSA does not publish a separate surveillance figure for the South West, so no regional number is shown here. The most recent national figure recorded 472 confirmed cases of legionellosis across England and Wales in 2024 — the England & Wales average context, not a count for this region.

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

Typical cost in Bristol

Legionella risk assessment costs in Bristol 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 West 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 Bristol itself; the cases below are the most recent recorded elsewhere in the South West 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:

Royal United Hospitals Bath NHS Foundation Trust, 2018 (Healthcare) — fined £300k. A cancer patient died in 2015 after exposure to legionella in a hospital ward annex. A separate water loop feeding the annex, opened in 2009, had never been temperature-checked or tested. The strain was not matched to the system, so the charge was exposing patients to risk.

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 Bristol

We are building a directory of qualified water hygiene assessors in Bristol 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 Bristol area
• Will quote against a clear scope (number of outlets, inclusion of hot and cold surveys, whether sampling is included)

Legionella testing labs covering Bristol

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 Bristol and accept posted samples:

• One Scientific Limited (UKAS no. 2048)
• Feedwater Laboratories (UKAS no. 2234), turnaround ~10 days, from £82.68 per sample
• Eurofins Water Hygiene Testing UK Limited (UKAS no. 9658)

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 Bristol

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

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