Legionella risk assessment in Chester

Updated 15 September 2026

Chester's legionella workload is split between tourism and healthcare. The walled city centre draws visitors year-round to hotels, guesthouses and restaurants, many in listed buildings and converted townhouses where pipework has been adapted repeatedly around historic fabric. The Countess of Chester Hospital is the main NHS site, and the University of Chester adds teaching and residential buildings across several sites. Chester Zoo and the racecourse bring large visitor facilities with extensive catering and washroom provision, so leisure and hospitality premises make up an unusually large share of the local assessment and monitoring workload.

Local water supply

The mains water supplier for Chester is United Utilities (United Utilities 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.

Legionnaires' disease: the national picture

UKHSA does not publish a separate surveillance figure for the North 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 Chester still needs a risk assessment, a control scheme, and the records to show the scheme is being followed.

Typical cost in Chester

Legionella risk assessment costs in Chester 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 North 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 Chester itself; the cases below are the most recent recorded elsewhere in the North 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:

Sanctuary Housing Association, 2024 (Housing) — fined £900k. In 2018 every water sample at a Birkenhead sheltered-housing scheme tested positive for legionella. The water system was poorly managed, staff were inadequately trained, and residents were wrongly told the water could be boiled and used. Vulnerable residents were evacuated; no one fell ill.

Mother Redcaps Care Home, 2012 (Care home) — fined £7k. A Wallasey care home had no system to manage its hot and cold water and failed to comply with an HSE improvement notice despite two extensions, putting elderly residents at 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 Chester

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

Legionella testing labs covering Chester

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 Chester and accept posted samples:

• Alpha Scientific Limited (trading as Alpha Scientific / ADEY) (UKAS no. 7620)
• 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 Chester

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

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