You don't need or want the holding tank to be pressurized.
The weight of the water in the tank creates pressure and
that is what you measure with one transducer. That
pressure tells you the exact level of water in the tank.
Another simple possibility. If you don't mind running a wire
from the tank to the house, you could probably use an
off-the-shelf water pressure gauge for auto or marine.
You get a transducer and a gauge that work off 12V.
You'd need one that reads from 0 to about 25 psi and
I think you could find one close to that. Then you'd
have a gauge that shows the water level.
You might be able to rig a mechanical indicator that shows over the edge
of the tank.
If you only need one or two level indicators you could have lights (like
a light bulb) at the tank visible from the house. Other level indicators
include float switches and simple conductivity.
I asked three neighbors this weekend, and, ALL of them have the same
They all have a block of brightly painted wood that is at the outside
bottom of one tank (all tanks are in parallel) when the water is full; and
it slowly rises, a few inches every few hundred gallons, until it's at the
The one thing different is that they all said their wells pump continuously
... so ... I must have a local problem with water flow.
I 'guess' there could be a three-light system, green being full, yellow
being half empty, red being lower than that (or something like that), but,
actual levels would be more informative.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.