ALAMOSA, Colo. (AP) -- Alamosa's tap water was contaminated with two parasites in addition to salmonella, which left the city of about 9,000 with no drinking water for weeks.
Officials used chlorine to kill the bacteria.
State health officials say tests completed Wednesday found traces of giardia and cryptosporidium in samples of water taken from before the chlorine flush began on March 25th.
Alamosa city clerk Judy Egbert says the high concentration of chlorine sent through the city's 50 miles of pipeline should have been enough to kill the organisms -- protozoan parasites that are common in the environment -- as well as the salmonella bacteria.
Residents were unable to touch the water during the high-chlorine flush, but have been able to shower with it since March 31.