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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

CTWC - Shoreline Region-Guilford System

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0535 ppb2422ND - 0.110 ppb
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
2014-02-10201402110107AM0.0420 ppb
2014-02-10201402110093AM0.0600 ppb
2014-02-10201402110109AM0.0640 ppb
2014-02-11201402120403AMND
2014-02-11201402120573AM0.0980 ppb
2014-02-11201402120674AM0.0320 ppb
2014-02-11201402120438AM0.0410 ppb
2014-02-11201402120405AM0.0370 ppb
2014-02-24201402250182AM0.0350 ppb
2014-04-08201404090510AMND
2014-04-08201404090427AM0.110 ppb
2014-05-21201405220336AM0.0560 ppb
2014-05-21201405220417AM0.0340 ppb
2014-08-04201408050412AM0.0360 ppb
2014-08-04201408050418AM0.0880 ppb
2014-08-04201408050337AM0.0620 ppb
2014-08-04201408050384AM0.0580 ppb
2014-08-25201408270547AM0.0830 ppb
2014-08-25201408260368AM0.0690 ppb
2014-08-26201408270820AM0.0540 ppb
2014-08-26201408270836AM0.0520 ppb
2014-08-26201408270840AM0.0700 ppb
2014-11-18201411190581AM0.0470 ppb
2014-11-18201411190387AM0.0560 ppb