Hi John
Nice thinking. I've seen the phrase "The Healthy Option" used when it relates to carpets from the sales side ( could it be a Carpet Foundation idea?)
As for a universally adopted logo, my initial thoughts are concerned with the un-skilled/less knowledgeable CC's out there. They could easily show a logo, perform a service and possibly ADD to the allergen problem eg poor clean and/or overwet/under dryed leading to mould spores creating significant and maybe extra health issues.
As many will be aware, the NCCA are working with BSI to produce a PAS for carpet cleaning. THis will hopefully be used by a very high percentage of UK/Europe trainers and other interested parties as a foundation for training Carpet Cleaners. Something that has been dicussed by many in our industry are topics such as further education training for such topics as cleaning for health. I'm sure it will happen whether generically, as with organisations such as NCCA and IICRC, or in a branded way such as with Allerg-Stop etc.
As for the NCCA, you are quite right when you state that our duty is to our members, but there's absolutely no doubt in my mind that the Association has brought about many benefits to the WHOLE of our industry. Obviously the message is getting through because there's been a membership growth in excess of 25% in recent years, so things must be moving in the right direction. However, if we were to have even more members, this would allow even more resources to be available to plough back into the industry. The NCCA is a "non-profit making" concern. So after expenses and running costs, profit is re-invested.
Although it is not my reason for joining, especially as the NCCA is not a marketing organisation, just one enquiry from the NCCA Website earlier this year has paid for my NCCA Membership for the next 9 years

Safe and happy cleaning

Ken