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Personally I would not worry about it. 27 ppb is a VERY small amount and IMHO not likely to harm you even if you were a fish. The EPA probably has been heavily lobbied by the treatment system suppliers to lower allowable standards so they can sell more treatment units. Similarly, unless you live 24/7/365 in a basement sealed tighter than a thermos bottle, Radon is another deliberately created problem to sell treatment systems.
In any case you can spend thousands to improve your perceived security without actually achieving any change.
While I do not dissagree with what your saying, the reverse osmosis is relatively cheap piece of mind with a benefit of Excellent tasting drinking water.
As Reverse osmosis also removes Iron, Manganese and Calcium it will provide much better drinking and cooking quality water. If on the whole houese it will go a long way to avoiding rust stains on the plumbing and calcium buildup in the washing machines. It was probably money well spent.
Running the whole house on reverse osmosis requires a really big system, and would require a well capable of producing water at a much higher rate in order to keep up with demand, or a big high-pressure tank to store filtered water.
Also, reverse osmosis produces a LOT of waste water -- for every gallon of "clean" water produced, you're dumping 4-8 gallons of wastewater. Running this into your septic system will overwhelm it, dumping it in the garden is adding arsenic where you don't want it.
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