Asbestos in Drinking Water and Environment
Asbestos is a fibrous mineral occurring in geologic deposits. Asbestos can enter the drinking water through the natural weathering of geological material containing asbestos or for a period of time cement water lines were used that contained asbestos. As the water lines decay, the asbestos enters the drinking water. “Asbestos is a generic term used to describe hydrated magnesium silicate minerals that crystallize as bundles of long, thin fibers which readily separate when broken or crushed. These minerals include chrysotile (serpentine) and fibrous varieties of amphibole group minerals such as crocidolite, amosite, anthophyllite, tremolite, byssolite, and actinolite. The special properties of asbestos — high tensile strength, flexibility, and resistance to heat, chemicals, and electricity — have made it well suited for a number of commercial applications, particularly as fire-resistant tiles and insulation (Source).”
They are found in areas with igneous and metamorphic bedrock. Asbestos exposure has been linked to these manufacturing sectors: shipyards, power plants, chemical plants, oil refiners, and mining. The following trades are more likely to be exposed to asbestos drywall tapers, electricians, firefighters, auto mechanics, and plumbing and heating contractors. This is one reason we suggest you obtain a copy of your Neighborhood Hazard Report and if you are a public water customer to get a copy of your consumer confidence report (see below).
In 1974, the maximum contaminant level goal, i.e., MCLG, for asbestos was 7 million fibers per liter or MFL. In 1992, the Phase II Rules set the drinking water standard at 7 million fibers per liter was adequate to protect human health. Some people who drink water containing asbestos well in excess of the maximum contaminant level (MCL) for many years may have an increased risk of developing benign intestinal polyps.
For large scale water treatment – coagulation/filtration, diatomaceous earth filtration, nanofiltration, and corrosion control with sequestering are commonly used. For residential treatment – the most likely and reliable form of treatment would be a combination of reverse osmosis system that includes a filtration system that removes particles < 1 micron. This would include microfiltration, ultrafiltration & nanofiltration. The appropriate NFS Standards that would apply would be NSF / ANSI 53 and NSF/ ANSI 58.
NSF/ANSI Standard 53: Drinking Water Treatment Units – Health Effects
Overview: Standard 53 addresses point-of-use (POU) and point-of-entry (POE) systems designed to reduce specific health-related contaminants, such as Cryptosporidium, Giardia, lead, volatile organic chemicals (VOCs), MTBE (methyl tertiary-butyl ether), that may be present in public or private drinking water.
NSF/ANSI Standard 58: Reverse Osmosis Drinking Water Treatment Systems
Overview: This standard was developed for point-of-use (POU) reverse osmosis (RO) treatment systems. These systems typically consist of a pre-filter, RO membrane, and post-filter. Standard 58 includes contaminant reduction claims commonly treated using RO, including fluoride, hexavalent and trivalent chromium, total dissolved solids, nitrates, etc. that may be present in public or private drinking water.
other routes of exposure – Airborne
Asbestos dust was been found to have carcinogenic effects. The inhalation of asbestos fibers can cause fatal illnesses like malignant lung cancer, mesothelioma, and asbestosis.
City Water Customers for Public Water Supplies – Check your consumer confidence report.
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