Wow- what differences we have. I personally have 2 2500 gallon tanks and wish I had more.
I live in a place that has a small dam in a creek about 2000 feet from my house, goes into 2 10,000 gallon tanks with a third 10,000 tank as a fire fighting reserve.
The water is then piped to various 11 households who use it.
So don't be afraid of tanks- more is better-lol.
If you well is not pretty sediment free, it will accumulate at the bottem but you simply get a pole or something ( I have heard of children being dropped into the tank for this) at a point the water is not to the top and stir it all up, then using your installed faucet at the bottom (they need to install this) use the sludged up water to water your lawn or garden.
You can sanitize this system by putting in a small amount of bleach in the tank as it fills (read the amount to use carefully- I over did it once) and let it run through your pipes to sanitize them too. Once a year should be enough for that- probably in the winter when there is lots of water.
There are some real advantages to storing water like this:
1) pump goes out- no panic, you have enough water to get thingsd fixed without having no water.
2) in case, well fails due to drought, same thing
3) in case of electric outage, if you're gravity fed, same thing
4) in case of fire- a lttle extra is a good thing.
Quail antwerp- I think that the air thing is a pressure tank, not a storage tank. I have pressure tanks too and sometimes when they are failing or have a valve leak, they do need to be air charged. A leak in the pipes sometimes will act to lose pressure too but that recharges when the pump is on.
PSS- Make sure they installers put a water level gauge on the outside of the tank- this is simply tee'd off the bottom faucet (see above) with a small shut off itself and is taped to the side of the tank - I have a small fish cork bobber thing in mine so I can see the level from far away.
PSSS- Do you freeze there? If not why not outside on the shady side of the garage or something- Depending on the basement, draining it would seem to be a problem as would a leak (which I admit I hace never had at the tank.) Also, if it's higher than the house, gravity fed will work. Do you already have a pressure tank?