Cmesweat

You don't need a siphon, you need to install a check valve in the line...................................but the county water supply should be pressurized at all times, so I don't know why you're having this problem.

For siphoning, the output end has to be lower than the input end. If you can't set it up like that, you can use a one-way valve. (Though I think there is a maximum vertical column of water that a one-way valve will maintain.)

I was gonna use 5 verticle columns with two one way valves at each end and each two foot high columns each 1 1/4 inches in diameter .county line is 8 inch diameter

Put in as many sections and valves as you like, but it won't make the water go back uphill.

_{(I may've missed the point - if so, feel free to mark this OT).}

Talk to British Petrolium. They can siphon oil more than a mile up-hill!

You need a booster pump. The county water doesn't have enough head to lift it up your hill. This may only happen at certain times, depending on demand and pipeline capacity.

If you have a water flow downhill, you can use the flow to pump some back up hill by use of a Hydraulic ram see here. It operates as an oscillator and can be made on various scales. The ratio of water going downhill to up hill is a function of the ultimate height you want your uphill pool to be. They can be cascaded.

You can use it to fill an uphill pool and then feed your water system by gravity feed. They are not very efficient but are cheap and long lasting and quite suitable for unattended operation. One can also use a Pelton wheel to make electricity to operate a pump which may make a higher pressure than a ram

Ram pumps! That's what I've been looking for on the net. Totally inefficient, but they work!

If you are losing water then you have a opening to the atmosphere (ie. siphon) already! I agree that the water line is under a constant pressure from the supplier, otherwise, you would not have it on the hill to begin with.

Look for a leak.

Sounds like you need an anti-siphon valve for cases where the county water pressure is low. They are required here for lawn sprinklers to keep contaminated water from entering the city supply in case the water pressure is gone.

You beat me to it, damn! I was thinking more in line of thishttp://www.plumbersurplus.com/Prod/Watts-Back-flow-Preventer-Series-009M2QT-1-1-4-(0062920)/5793/Cat/317 , but a couple of check valves might be cheaper