Frequent Questions

The maximum contaminant level (MCL) for asbestos (fibers greater than 10 micrometers in length) is 7 million fibers per liter (MFL). What are common sources of asbestos in drinking water?

Asbestos in drinking water may be from the erosion of naturally occurring mineral deposits or from the decay of asbestos cement water mains. Asbestos fibers are resistant to heat and most chemicals and have been included in a variety of products including cement pipes. Additional information about asbestos in drinking water is available at

Have more questions? Submit a request