Is radon in water that serious an issue, and can a simple kitchen sink aerator plus time handle it?

Massachusetts: 10,000 units safe limit
New Hampshire:  2,000 units safe limit
Maine: 20,000 safe limit
EPA: 20,000
our house: 14,000

??? what's actually true?

if memory serves.  Don't quote me on these numbers, the point is just that each source has a different number that it presents as if it were solid fact.  

A radon aerator costs north of $3500 and uses some electricity.

The former owner of the house we're looking at lived there her whole life.  She looks fine, is upper middle-aged, I'd say.  Her parents lived there.  She never tested the water for radon, doesn't remember if they ever tested the air for radon.  (The air level is pretty low).

The well was dug in 1940, 200' deep.  Not that deep.  Not really granite country, but near-ish to New Hampshire.

I'm thinking if areating it is all it takes, why not just add an aerator to the kitchen sink for the drinking water, leave the water in a pitcher in the outside porch over night, or in winter we could put it away from the bedrooms over night, or put a lid on it and vent it in the morning and then drink from the pitcher.

I was hoping someone would have done experiments on this already and I have found nothing on the net or on permies.  Anyone?  Thanks, team!

met a couple in Sweden that took all their showers at the local swimming pool showers, just because of radon issues. They very rarely washed the dishes, (only when the pile was huge) and didn't flush for nb 1 (I would have arranged for a dry toilet!).
The crazy thing is that there is something called radon therapy, not sure how healthy it is...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2477705/

Radon and Drinking Water from Private Wells ...

Aeration treatment – spraying water or mixing it with air and then venting the air from the water before use, or

GAC treatment – filtering water through granular activated carbon. Radon attaches to the carbon and leaves the water free of radon. Disposing of the carbon may require special handling if it is used at a high radon level or if it has been used for a long time.

In either treatment, it is important to treat the water where it enters your home (point-of-entry device) so that all the water will be treated.

https://www.cdc.gov/healthywater/drinking/private/wells/disease/radon.html

Radon is also a big issue in parts of the UK, and I found some info that may be of help putting the risks in context:

Most of the exposure from radon in a private drinking water supply comes from breathing in radon decay products when they are released to indoor air because of normal household uses of water, such as showering and bathing. Radon exposure from drinking the water is much smaller.

source

 
For radon removal, point-of-use systems fitted to the drinking water tap (as opposed to point-of-entry systems, which treat the entire supply) are not acceptable as radon is released wherever water is used in the house and it can then be inhaled.

source

They conclude an aeration system (at entry to property) is optimum solution for most domestic supplies (storage and filtration alternatives discussed) this liberates the gas which then disperses in a ventilated area. I couldn't find any pictures, but I'm imagining some sort of fountain/ cistern. Apparently there is a three month test which assesses the radon inside the house and measures the effectiveness of the treatment.