APPENDIX 7 to Legionella Procedure

Extent and frequency of inspections

Generally the extent and frequency of tests are given in the following checklists, which are applicable to all Class B and C premises.

Hot and Cold Water Services
SERVICE / TASK / FREQUENCY
Hot Water Services / Arrange for samples to be taken from hot water calorifiers, in order to note condition of drain water.
Check temperatures in flow and return at calorifiers.
Check water temperature up to one minute to see if it has reached 50oC in the sentinel taps.
Visual check on internal surfaces of calorifiers for scale and sludge. Check representative taps for temperature as above on a rotational basis. / Annually
Monthly
Monthly
Annually
Cold Water Services / Check tank water treatment remote from ball valve and mains temperature at ball valve. Note maximum temperatures recorded by fixed max/min thermometers where fitted.
Check that temperature is below 20ºC after running the water for up to two minutes in the sentinel taps.
Visually inspect cold-water storage tanks and carry out remedial work where necessary. Check representative taps for temperature as above on a rotational basis. / Six monthly
Monthly
Annually
Shower heads / Dismantle, clean and de-scale showerheads and hoses. / Quarterly or as necessary
Little-used outlets / Flush through and purge to drain, or purge to drain immediately before use, without release of aerosols. / Weekly
Other Risk Systems
SERVICE / TASK / FREQUENCY
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.
Ensure automatic purge of residual water is functioning.
Clean and disinfect all wetted parts.
Sampling for legionella. / Six monthly or according to manufacturer’s instructions.
As part of machinery shut down.
As indicated by risk assessment.
As indicated by risk assessment.
Spray humidifiers, air washers and wet scrubbers / Clean and disinfect spray humidifiers/air washers and make-up tanks including all wetted surfaces, de-scaling as necessary.
Confirm the operation of non-chemical water treatment (if present). / Six monthly
Weekly
Water Softeners / Clean and disinfect resin and brine tank – check with manufacture what chemicals can be used to disinfect 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 down 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 systems. / Six monthly
Spa baths / Check filters – sand filters should be backwashed daily.
Check water treatment – pools should be continuously treated with an oxidizing biocide.
Clean and disinfect entire system. / Daily
Three times daily
Weekly
Horticultural misting systems / Clean and disinfect distribution pipework, spray heads and make-up tanks including all wetted surfaces, de-scaling 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 system. / See manufacturer’s instructions
Indoor fountains and water features / Clean and disinfect ponds, spray heads and make-up tanks including all wetted surfaces, de-scaling as necessary. / Interval depending on condition