SECURITY – Invisible toxic chemicals are contaminating drinking water for 80,000 people south of Colorado Springs, one of 63 areas nationwide where the chemicals, widely used to fight petroleum fires, have been measured at levels the EPA deems dangerous. These perfluorinated chemicals rank among the worst in an expanding multitude of unregulated contaminants that federal scientists are detecting in city water supplies, including hormones, pesticides, antibiotics and anti-depressants.