For years, the Colorado Department of Public Health and Environment's leaders believe one of its chemists altered the results of drinking water tests, but the state did not catch the data manipulation until late 2023, and then CDPHE waited months to tell people. The state believes its chemist manipulated data for drinking water tests since at least 2020. A spokesperson said these tests represent 3% of Colorado's drinking water systems. As a result, the EPA has revoked the state's certification to perform a number of tests, and CDPHE has recalled more than 7,000 test results. CDPHE's medical director told 9NEWS he does not believe the altered tests have caused an imminent health risk. Read the full story: https://www.9news.com/article/news/investigations/cdphe-chemist-manipulated-drinking-water-safety-results/73-21215b0e-f03d-4799-9e19-947da2afbf99 More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.