We can design a bespoke programme of L8 Monitoring (Legionella Monitoring) to suit our customers individual needs. Below sets out a typical Monthly L8 Monitoring Programme.
Water Outlets
Where possible, the supplying pipework to the areas that are operating above 20°C after 2 minutes of running should be fully insulated. If the pipework is fully insulated or by insulating the pipework it does not reduce the temperatures, continue to flush weekly. Additionally, consideration should be given to remove the outlets.
Cooling Towers
Ensure cooling towers are visually checked daily for excessive drift, especially in highly populated areas. Also check the treatment chemical levels and plant operation.
Weekly/Monthly/Quarterly Legionella monitoring checks should be carried out by trained operatives, preferably by the site water treatment company.
Heating Systems
Whilst it is not necessary to implement continuous measures with respect to the control of Legionellosis during maintenance, testing and commissioning. This system may be the source of respirable aerosols and suitable precautionary measures should be taken.
Record Keeping
Implement a Control and Monitoring system including a Log Book to record all actions.
Annual Review
An Annual Review of L8 services should be in place in order to ensure that lines of communication are present and that the contract is being carried out satisfactory.
A Typical L8 Legionella monitoring programme and Legionella Risk Assessment carried out by Green Water Services would include the below. Also, please visit our Legionella Control page for further information.
| Type of Water System | L8 Services | Frequency |
|---|---|---|
| Hot Water Services | Samples to be taken from hot water calorifiers, in order to note condition of drain water | Annually |
| Check temperatures in flow & return calorifiers | Monthly | |
| Check temperature up to one minute to see if it has reached 50’C In the sentinel taps | Monthly | |
| Visual check on internal surfaces of calorifiers for scale and sludge. Check representative taps for the temperature as above on a rotational basis | Annually | |
| Cold Water Services | Check tank water temperature remote from ball valve and mains temperature at ball valve | Six Monthly |
| Check that temperature is below 20’C after running water for up to two minutes in the sentinel taps | Monthly | |
| Visually inspect cold water storage tanks and carry out remedial work where necessary. Check representative taps for temperature as above on a rotational basis | Annually | |
| Shower heads | Dismantle, clean and descale shower heads and hoses | Quarterly or as necessary |
| Little-used outlets | Flush through & purge to drain, or purge to drain immediately before use, without use of aerosols | Weekly |
| Cooling Towers | Carry out clean & disinfection | Bi-Annually |
| Pack removal & clean if practicable | Annually | |
| Ultrasonic humidifiers/foggers and water misting systems | If equipment fitted with UV lights, check to ensure effectiveness of lamp (check to see if within working life) and clean filters | Six-monthly or according to manufacturers instructions |
| Ensure automatic purge of residual water is functioning | As part of machinery shut-down | |
| Clean and Disinfect wetted parts | As indicated by risk assessment | |
| Sampling for Legionella | As indicated by risk assessment | |
| Spray humidifiers, air washer and wet scrubbers | Clean and disinfect spray humidifiers/air washers and make up tanks including all wetted surfaces, descaling as necessary | Six Monthly |
| Confirm the operation of non-chemical water treatment if present | Weekly | |
| Water softeners | Clean and disinfect resin and and brine tank – check with manufacturers what chemicals can be used to disinfect the resin bed | As recommended by manufacturer |
| Emergency showers and eye-wash sprays | Flush through and purge to drain | Six monthly or more frequently if recommended by manufacturers |
| Sprinkler and hose reel systems | When witnessing tests of sprinkler blow-sown and hose reels, ensure that there is minimum risk of exposure to aerosols. | As directed |
| Lathe and machine tool coolant systems | Clean and disinfect storage and distribution system | Six-monthly |
| Spa baths | Water treatment tests | Daily |
| Specialist monitoring, sampling and callibration | Monthly | |
| Check filters – sand filters should be back-washed | As directed | |
| Horticultural misting systems | Clean and disinfect pipework distribution systems, spray heads and make up tanks including all wetted surfaces, descaling as necessary | Annually |
| Dental equipment | Drain down and clean | At the end of each working day |
| Car/bus washes | Check filtration and treatment systems, clean and disinfect systems | See manufacturers instructions |
| Indoor fountains and water features | Clean and disinfect ponds, spray heads and make up tanks including all wetted surfaces, descaling as necessary | Interval depending on condition |
Please contact us if you require any further information regarding our L8 risk assessements and Legionella monitoring. We are located in Leeds, Croydon, Swadlincote and Burton-on-Trent, but our services are offered nationwide.
Green Water Services are LCA (Legionella Control Association) certified and comply to the HSG 274 guidance.
