Like Sammy said, just about every house in the SW United States has active termites. They take 4-6 years to colonize and begin doing damage. IMHO, the best thing to do is tent the house for fumigation every decade or so and spot treat any you see in between.
You can never get rid of termites completely .... well, unless you burn your house to the ground.
Here's photo the wife took 2 weeks ago when a swarm flew onto our house. She was armed with Raid and saw them coming so I hope none got too far into those vents. I have only seen drywood termites in the 26 years we've lived in this house. Termites fly poorly and are mostly carried by the wind. So they don't choose any house by color, flavor, or taste.
Redwood, cedar, plywood, and pressure treated wood can slow termites down, but after a few years, they are susceptible too. I try to paint all sides of any lumber I add to my home whether inside or out to help seal it from bugs and water.