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EWG's Tap Water Database — 2019 UPDATE

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Asbestos

Contra Costa Water District

Asbestos is a mineral fiber introduced into water by the dissolution of asbestos-containing minerals and from decay of asbestos cement in water mains. Asbestos causes cancer when ingested or inhaled.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND10ND
2014ND10ND
2015ND10ND
2016ND10ND
2017N/A00N/A

MFL = million fibers per liter

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 7 MFL

The legal limit for asbestos, established in 1991, was based on toxicity studies in laboratory animals conducted in the 1980s.

MFL = million fibers per liter

All test results

Date Lab ID Result
2012-07-099590-003-0800ND
2012-07-169590-003-1135ND
2013-07-159590-003-1345ND
2014-07-079590-003-1455ND
2015-07-069590-003-0815ND
2016-07-119590-003-1350ND