Hello, I am looking for some advise on Radon gas being reportable incident if its above certain levels. I have looked for various websites and other referances. The only guidence I can find is that if the level is above 400 bq/m3 then you must take immdiate action.I can not see anything that states they you must make a report to the HSE. Please could someone advise on what the case maybe? Many thanks Gavin

Sort of related to this, I've had a home in the North Pennines for years now and when I bought it the survey recommended we establish levels of radon present as the house is in an area of former lead mining. It came back with incredibly low levels of radon but I was recommended to reduce it further by installing underfloor venting. I'm unclear how that will dilute the levels?

martin . In Cumbria , we used to be made to build radon barriers into the cavity wall below DPC . this was made by a combination 500 grade visqeen and 450mm DPC. I remember with 3 mile radius of any landfill ? The problem always was it was very unreliable in the corners obviously resulting in possible leaks I am just wondering if you have the details of the plans and said radon barriers ? I doubt if ever they did the intended purpose that's in my view . joe

And try this http://www.hse.gov.uk/radiation/ionising/radon.htm and look at the part titled "Below ground workplaces" "For occupied below ground workplaces (for example occupied greater than an average of an hour per week/ 52 hours per year), or those containing an open water source, the risk assessment should include radon measurements. This applies to all below ground workplaces in the UK, irrespective of the above ground Affected Areas status." This means that every employer, regardless of whether or not they are in an affected area, has to carry out a Radon survey of all their below ground workplaces where people are at work for more than 1 hour per week. There are a lot of workplaces to be surveyed and very few employers even know about the requirement.