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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

Atascadero Mutual Water Company

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

MORE ABOUT THIS CONTAMINANT

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.111 ppb167ND - 0.310 ppb
2014ND10ND
2015ND20ND
2016ND130ND
2017ND10ND
2018ND20ND
2019ND130ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2013-04-30201305010091AM0.240 ppb
2013-04-30201305010101AM0.220 ppb
2013-04-30201305010095AMND
2013-04-30201305010097AM0.260 ppb
2013-04-30201305010105AMND
2013-04-30201305010103AM0.240 ppb
2013-04-30201305010099AM0.210 ppb
2013-04-30201305010093AM0.310 ppb
2013-10-30201310310159AMND
2013-10-30201310310116AMND
2013-10-30201310310161AMND
2013-10-30201310310119AMND
2013-10-30201310310163AM0.290 ppb
2013-10-30201310310131AMND
2013-10-30201310310149AMND
2013-10-30201310310106AMND
2014-05-083761-042-1030ND
2015-06-043761-020-0845ND
2015-09-033761-016-0845ND
2016-02-113761-023-0840ND
2016-02-113761-044-1012ND
2016-04-283761-001-1010ND
2016-04-283761-050-0910ND
2016-04-283761-015-0920ND
2016-05-033761-006-0915ND
2016-07-053761-007-1030ND
2016-07-053761-012-0820ND
2016-07-053761-018-0840ND
2016-07-283761-053-0825ND
2016-07-283761-054-0845ND
2016-07-283761-040-0805ND
2016-07-283761-009-0750ND
2017-05-163761-042-1005ND
2018-06-073761-020-1015ND
2018-09-133761-016-0850ND
2019-02-123761-023-0900ND
2019-02-143761-044-0948ND
2019-04-163761-015-0845ND
2019-04-163761-001-0900ND
2019-05-093761-006-0835ND
2019-05-163761-050-0755ND
2019-07-183761-054-0930ND
2019-07-183761-053-0905ND
2019-07-183761-040-0940ND
2019-07-183761-018-1010ND
2019-07-183761-012-1018ND
2019-07-183761-009-0835ND
2019-07-183761-007-0950ND