FORT GARLAND — In the sandy hills scattered with piñon pine and spiky yucca, hundreds of people have relied on a water supply that is so much a part of the local culture that Costilla County residents describe it as a way of life.

Drilling for water is a pricey gamble on the high desert where many live off the grid at 7,500 to 10,000 feet of elevation. A well could cost $25,000 with no guarantee that water will spring, even after digging hundreds of feet.

Instead, many people in the poorest county in the state have opted for cisterns, reservoirs buried underground and covered with a plastic lid or cement slab. To fill them, residents drive 20 minutes or so to town, often weekly, with tanks in their pickup trucks or on their trailers to buy water at 10 cents a gallon, or they have it del

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