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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

Clear Lake City Water Authority

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

MORE ABOUT THIS CONTAMINANT

 

44

Samples

0

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.0214 ppb3621ND - 0.0510 ppb
2014ND80ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-04-09713558-85800.0350 ppb
2013-04-09713550-85800.0300 ppb
2013-04-09713532-85800.0330 ppb
2013-04-09713536-85800.0310 ppb
2013-04-09713544-85800.0320 ppb
2013-04-09713560-85800.0310 ppb
2013-04-09713554-8580ND
2013-04-09713562-85800.0360 ppb
2013-04-09713542-8580ND
2013-04-09713546-85800.0400 ppb
2013-04-09713548-8580ND
2013-04-09713534-85800.0330 ppb
2013-04-09713552-85800.0510 ppb
2013-04-30716908-8746ND
2013-07-10730567-9293ND
2013-07-10730571-92930.0450 ppb
2013-07-10730591-9304ND
2013-07-10730595-9304ND
2013-07-10730569-92930.0380 ppb
2013-07-10730565-92930.0450 ppb
2013-07-10730593-9304ND
2013-07-10730585-92930.0500 ppb
2013-10-08751275-9997ND
2013-10-08751277-9997ND
2013-10-08751367-9999ND
2013-10-08751310-9999ND
2013-10-08751308-99990.0300 ppb
2013-10-08751283-9997ND
2013-10-08751306-99990.0320 ppb
2013-10-08751267-9997ND
2013-10-08751296-9997ND
2013-10-08751262-99970.0440 ppb
2013-10-08751244-99900.0320 ppb
2013-10-08751242-99900.0340 ppb
2013-10-08751248-99970.0330 ppb
2013-10-08751246-99900.0360 ppb
2014-01-08765736-10543ND
2014-01-08765714-10532ND
2014-01-08765704-10532ND
2014-01-08765706-10532ND
2014-01-08765708-10532ND
2014-01-08765710-10532ND
2014-01-08765716-10532ND
2014-01-08765722-10532ND