I've thought about this, but I don't think so. My last two paragraphs addresses what I think are RO's risks.
First there has to be bacteria in the municipal water. The city does a pretty good job there,
Second there has to be organic matter for the bacteria to grow. Again, cities are good with that.
But even if you have bacteria in your water, a good RO system's pores should be smaller than a virus (really smaller than a prion) or it won't be able to remove metallic ions.
But let's assume after two years these assumptions fail because the filters get old. Replace the filters and flush the system with bleach.
My fear with RO are bad filters. I once had a Zero pitcher and it tasted bad, acidic. A few weeks later there was a recall that the RO membrane was leaking ionomers.
Moral of the story- trust your senses. If municipal water tastes bad, it's bad. If bottled water tastes bad, it's bad. If RO water tastes bad, it's bad.
From someone that keeps aquariums, municipal water that is stripped of it's chlorine by carbon has the ingredients to grow bacteria. They need three things, carbon, phosphate and nitrogen, all of which will be present to varying degrees. Particularly nitrates and phosphates. They're not harmful until concentrations are really high but certainly enough to grow bacteria.
Also consider what your holding tank and supply to the water, either through leaching, accumulation or simply time
RO (without DI) does not remove everything. With an advanced setup like with a booster pump and a 5:1 waste ratio and a high quality filter you would probably see a 95% reduction.
But without a booster pump or if you've got a lower waste ratio either by restriction or piggyback ro membranes you'll have a lower rejection rate.
And that ignores the fact the you really need to be back flushing the membrane regularly and rejection rates are measured after 30 minutes of continuous running, ions migrate when it's idle so you have to throw away a lot of water at the start that you're probably not doing
First there has to be bacteria in the municipal water. The city does a pretty good job there,
Second there has to be organic matter for the bacteria to grow. Again, cities are good with that.
But even if you have bacteria in your water, a good RO system's pores should be smaller than a virus (really smaller than a prion) or it won't be able to remove metallic ions.
But let's assume after two years these assumptions fail because the filters get old. Replace the filters and flush the system with bleach.
My fear with RO are bad filters. I once had a Zero pitcher and it tasted bad, acidic. A few weeks later there was a recall that the RO membrane was leaking ionomers.
Moral of the story- trust your senses. If municipal water tastes bad, it's bad. If bottled water tastes bad, it's bad. If RO water tastes bad, it's bad.