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First, what type of water feature do you have? Is it a pond, a pond and waterfall, or fountain, and what type of liner/basin does it have?
Next, is it losing water only when running, or if you were to turn off the pump, will the water loss stop? If it only loses water when running, it narrows down where to look for the leak.
Based on these details, I can steer you in the right direction on finding the leak, and possibly fixing it yourself. Each type of liner/basin has its own type of repair, and most are not difficult or expensive to repair if they are minor and you can locate it. Sometimes, the leak on a pond and stream is where someone stepped on a rock near the edge, and it is diverting water out of liner while running. These repairs are just finding the culprit rock/debris and placing it back in place, and raising the liner so that the water is contained in the liner.
Also, you don't have to have an outside company come in with expensive equipment to find a leak, I can steer you in the right direction, and it will take some time and a little trial and error, but you should be able to find it.
I will wait to hear back from you with some more details in order to steer you in the right direction.