ppm is an abbreviation of parts per million. 43 Replies. ppm is dimensionless quantity, a ratio of … Under rules published in the New Jersey Register, the DEP proposes maximum contaminant levels, or MCLs, of 14 parts per trillion for PFOA and 13 parts per trillion for PFOS. In August, the water board slashed the levels at which suppliers have to notify their governing boards, such as county supervisors, to 5.1 parts per trillion for PFOA, from 14 parts per trillion previously, and 6.5 parts per trillion for PFOS, from 13 parts per trillion previously. In particular, within DOD documents, EWG found evidence of PFAS detections in groundwater at 14 installations that were above 1 million parts per trillion, or ppt, far above the 70 ppt drinking water advisory level recommended by the Environmental Protection Agency. The state is proposing that the maximum contamination for 1,2,3-TCP in drinking water be set at 5 parts per trillion. I never thought about how good water filters were until I ordered a ZeroWater filter and it included a water testing tool. The LHA level is 70 ppt for PFOA and PFOS individually or combined. Part 1. The EPA’s recommended limit is 70 parts per trillion, but the water sample from the trailer park contained chemical concentrations of 96 parts per trillion, the newspaper said. ppm is a value that represents the part of a whole number in units of 1/1000000. How to grasp such numbers? They claim their filter results in water with 0 PPM (parts per million). What’s in your water? The rules also propose these levels as formal ground water quality standards for the purposes of site remediation activities and discharges to ground water. One part per trillion is the equivalent of one grain of sand in an Olympic-size swimming pool. This has brought into regular discourse a word that we don’t use much and don’t understand at all: trillion. The Board will set new response levels (RLs) of 10 parts per trillion (ppt) for PFOA and 40 ppt for PFOS. To provide Americans, including the most sensitive populations, with a margin of protection from a lifetime of exposure to PFOA and PFOS from drinking water, the EPA has established the health advisory levels at 70 parts per trillion. The EPA’s lifetime health advisory sets a combined limit of 70 parts per trillion for PFOA and PFOS. The state water board has proposed a standard for 1,2,3-TCP and held a hearing to receive public comment. As science on the health effects of these chemicals evolves, the EPA will continue to evaluate new evidence. SACRAMENTO – The State Water Resources Control Board announced today it will reduce the levels of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) in drinking water that trigger responses by local water systems. Some organic contaminants, a diverse group of chemicals that includes pesticides, PCBs and dioxins, may be measured at sub- ppb levels and may be expressed as ng/L (nanograms-per-liter = parts-per-trillion) or even 1 pg/L (picograms- per-liter = parts-per-quadrillion).