Kenneth C. Crowe II is reporting for the Times Union after a sixth round of testing, a source for the PFOA/PFOS contamination surrounding the Algonquin Middle School in Poestenkill [POST-en-kill], Rensselaer County has still not been determined, the county Health Department announced last week. The voluntary testing at 20 homes determined that none of them had results at or above the state-permitted limit of 10 parts per trillion, according to the county. So far, the county has announced test results for 77 homes. Of these, 10 homes have reported results over 10 ppt. “We are obviously happy to see no new cases for PFOA in Poestenkill ..., but recognize no source has been determined. We continue to work with the state to find the source or sources for the PFOA contamination and to get more answers,” county Public Health Director Mary Fran Wachunas said. The county has been working with town officials, the state Department of Environmental Conservation and the state Department of Health on the testing and investigation of the chemical pollution. The contamination became a concern after the Averill Park Central School District reported in January that water at the middle school exceeded the state level of 10 ppt. The county Health Department, DEC and the state Health Department will hold two public sessions on Wed., Dec. 8, at Algonquin Middle School to discuss the efforts underway to protect drinking water as well as the ongoing PFOA/PFAS investigation. Read the full story in the Times Union.