Water tank cleaning and disinfection
Over time cold water tanks, often found in lofts, basements and airing cupboards become dirty with debris, sediment, scale, sludge, biofilm, fouling, wall mould, stagnation, rust & corrosion, foreign bodies and plant growth. Should contaminants enter our water tanks or build up over time, they provide a breeding ground for bacteria such as Legionella bacteria and E.coli.
An annual inspection of cold water storage tanks will determine if cleaning and/or disinfection is required, as stated in the ACoP L8 (HSG 274 Part 2). Annual water tank cleaning is not a legal requirement, but annual water tank inspections are, where the water tank is inspected for its condition internally and externally. The water tank inspection will identify if a water tank clean is required or not.
Why do I need to clean my water tank?
Water tank cleaning is an essential part of water hygiene and Legionella control measures and something to be taken seriously both domestically and commercially. To maintain high quality water it is important that tanks are inspected regularly and cleaned when required to prevent bacterial proliferation. Protecting the water system’s users from potentially fatal diseases such as Legionnaires’ disease is vital, particularly when the users are vulnerable people such as children, the elderly, people with pre-existing illnesses, smokers, etc. These tanks should be inspected annually for their condition to identify if a water tank clean is required. To read more on cold water tank monitoring please visit our legionella monitoring page.
What else must I do with my tank?
Not only is it important to check your tanks for their internal conditions but they must meet design regulations as well, which help prevent bacterial growth inside the tanks. A poorly designed tank, clean or unclean may provide the right conditions for bacteria growth. For example, if your tank does not have a closely fitted lid, insects and bacteria may enter your tank. This is why tank design is just as important as a clean tank.
In summary, you must clean your tank where required, ensure it meets design regulations, and monitor your tank six monthly for its condition, design and temperature. Bacteria sampling is recommended on a six monthly basis to interpret the tank’s water quality. Legionella bacteria can double every 15 minutes.
How much is a tank clean & disinfection?
Water tank cleaning costs vary in price depending on the number and size of your tanks. Small water tank cleaning prices for tanks ranging from 117L to 500L might cost you between £200-£500.
Where as larger water tank cleaning prices for tanks ranging from 1,000L to 30,000L normally cost in excess of £500-£2000+.
Water tank cleaning process
Inspect Tank Design
Drain Water Tank
Chemical Disinfection (?)
Drain Water Tank
Remove H&S Signage
Install H&S Signage
Clean Water Tank
Refill Water Tank
Water Free to Use
Isolate Water Tank
Refill Water Tank
Test Chlorine Levels
Un-isolate Water Tank
About the tank clean and how long will it take?
uRisk’s water treatment, tank cleaning and disinfection services are carried out by our fully trained engineers, provided with RAMS, method statements and procedures to ensure the work complies with the ACoP L8 (HSG 274) and COSHH regulations. Disinfection works are carried out with the use of chlorine with all RAMS designed to ensure the safety of the water system’s users is paramount.
On average it can take our experienced engineers between 3-5 hours to clean your water tanks. However, the time taken to clean the tank often depends on a number of factors such as how dirty the tank is, how accessible the tank is, and the size of the incoming and outgoing pipework from the tanks to list a few factors.
When do I need a chlorination?
Where necessary, hot and cold water services should be cleaned, flushed and disinfected in the following instances, as specified in BS 8558:2011:
- New water system installations or refurbishment of hot and cold water systems
- Installation of new components
- Systems that have been out of use for long periods of time
- Evidence of contamination or stagnation in tanks
- Substantial alterations to the systems
- Following sample results indicating contamination
- During or following an outbreak of legionella
- Where indicated by the risk assessment
If you are uncertain on the actions you need to take then contact our team today.
Get a Quote
To get a quote you can phone, email or complete our ‘Get a Quote!’ form to receive a quotation within 24 hours.
Book an Appointment
Once you’re happy with your quote we’ll confirm a suitable date and estimated time of arrival for your appointment.
An engineer will be with you on your scheduled date, and will call you prior to arrival (when safe and possible).
Report & Support
Our team will quality assess your report for PDF distribution, typically within 2-10 days of the site visit.
All payments are due prior to booking completion unless agreed in writing for 30 days from the date of invoice. We will hold your booking time for 24 hours whilst we wait for payment.
Your dedicated water hygiene team
Customer Service Manager
Water Hygiene Engineers
Legionella Risk Assessment FAQs
When and how often do I need a risk assessment?
Under the Health and Safety at Work Act 1974 and in compliance with the Approved Code of Practice (ACoP L8, HSG 274), duty holders, including employers and those in control of premises, must ensure the health and safety of their employees or others who may be affected by their undertaking, this includes the risk of legionella. Legionnaires Disease is a form of pneumonia, which can be fatal and the main route of infection is through inhalation, by inhaling airborne water droplets that contain Legionella. This also applies if you are a private Landlord and have rental properties which are occupied.
This includes taking suitable precautions to prevent, manage and control the risk of exposure to legionella. You can do this by undertaking the following: a risk assessment, actioning all identified risks within the initial report with remedial works, sampling the water quality to confirm bacterial presence with water testing, and carrying out ongoing record keeping also known as monitoring.
Do I need testing, a risk assessment or both?
Legionella testing, water testing or sampling is not to be confused with a legionella risk assessment. You are required by law to undertake a legionella risk assessment under the Health and Safety at Work Act 1974, COSHH and a number of other regulations where you can show you are working to comply with the HSE's HSG 274 legionella guidelines.Testing or sampling whilst not a legal requirement on it's own, it plays an important role in determining how efficient a water system is managed. Your risk assessment may identify that sampling is required due to existing risks or as a control and management precaution. In this instance sampling then becomes a requirement from your assessment. Without an L8 risk assessment you will not know where and how many samples are required. And without water testing/sampling you cannot determine how affective your control and management is. These two actions therefore should be undertaken together, not necessarily at the same time but unison to effectively management your risk from legionella.
Water testing services include Legionella, e-Coli, total viable count (TVC), Pseudomonas, hard water, chlorine free, pH levels and more. Learn more about legionella testing. We only use UKAS approved laboratories giving you peace of mind that the test will be of the highest quality possible.
How much does an L8 risk assessment cost?
All assessments vary in prices depending on the number of water outlets, cold water storage tanks, hot water cylinders, combi boilers and other water assets that may be present. The number of assets within your water system will determine the time spent on site and how long it will take to produce your report.
So how much does it cost? Across the industry, prices vary enormously often depending on the size of the company you use and their processes, the speed of works and professionalism. There are two types of assessments, the first is commercial and the second domestic, also referred to as residential rental properties or landlord risk assessments.
Commercial risk assessments normally start from £250 to in excess of £750, however our prices start from £99 depending on the size of the water system and location.
Domestic risk assessments can range tremendously with a number of plumbers, gas engineers and other tradesmen offering these assessments without the specialist training, it’s important to check that your assessor or engineer is properly qualified. Our prices start from £55 for multiple landlord properties to £95 for single landlord properties. Our prices for residential rental properties are based on the property being no more than 5 bedrooms.
How long will the risk assessment take?
On average, the time our qualified assessor spends on site is 1 hour for every 10 outlets (sinks, showers, baths, etc). So an assessment can take anywhere between 30 minutes to 6 or 7 hours. It entirely depends on the size of your water system and the number of water assets you have such as cold water storage tanks, cylinders or combination boilers.
Our engineers will work closely with you to ensure minimal disruption to your business is caused. Clear and easy access to rooms and buildings will play a part in time spent on site at your premises.
When will I receive your findings?
You will receive your LRA report between 2-10 working days from the date the assessment was carried out. From time to time, not often, our team will need a little more time, so please expect to have your report no later than 30 days. Need your assessment sooner? Get your report, guaranteed next day delivery via email for just £50.
What happens after I receive the report?
Within your report document, you will have an action plan offering guidance which lists all identified risks, with photos, that need remedying in order of importance. By following our advice and undertaking remedial works you will reduce the risk of exposure to Legionnaires' disease. Once all the remedial works are complete, you will then need to focus on implementing your monitoring (periodical checks and maintenance) with a logbook for recording keeping all legal duties and monitoring requirements.
Are uRisk qualified?
Yes, all of our assessors are fully qualified and accredited by City & Guilds and can help assist you in meeting compliance today for HSE (ACoP L8). We are also Safe Contractor and Construction Online approved so you can rest assured that you are working with a trusted water hygiene service provider who put health and safety first.
All our engineers are DBS Checked to ensure suitable people are entering your premises and to safeguard vulnerable people. We are committed to maintaining the highest standards.
Do uRisk service my area?
Yes, our services are nationwide. Whether you have one or multiple water systems and one or multiple sites, we provide services across the country, with qualified engineers scattered throughout the UK and offices based in Hertfordshire which is a 30-minute train journey to London King’s Cross.
Why choose uRisk?
Over 25 years of water hygiene and legionella control experience.
Friendly and simple advice by phone, email & online at your convenience.
All staff are trained water hygiene consultants and engineers.
With engineers located all across the UK, we're never too far away.
Our labs are UKAS approved providing you with quality assurance.
Your one stop shop for Legionella control, no need to go elsewhere.