Over the last 80 years, much of the land surrounding Venetucci Farm was sold to the US army to establish the base now known as Fort Carson. Farming activities have stopped. In 2016, irrigation water was found to be contaminated with elevated levels of perfluorinated compounds (PFCs). The foundation that runs the farm has joined forces with a local water district to sue the US Air Force, alleging that toxic chemicals used in firefighting foam at a nearby base have tainted the water. Similar concerns have been raised about dozens of other bases across the country. But the problem is not limited to areas close to military installations. PFCs and related human-made chemicals, more generally known as per- and polyfluoroalkyl substances (PFAS), have been virtually unregulated since at least the 1950s. As well as at industrial sites, airports and bases, PFAS have long been used in household products. They are everywhere. A 2007 study estimated that PFAS are in the blood of 98% of Americans, while last year an analysis by the not-for-profit Environmental Working Group found that more than 1,500 drinking water systems nationwide could be contaminated by PFAS. Studies suggest that certain PFAS may affect the growth, learning and behaviour of infants and older children; lower a woman's chance of getting pregnant; interfere with the body's natural hormones; increase cholesterol levels; affect the immune system; and increase the risk of kidney and testicular cancer and thyroid problems.