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EWG's Tap Water Database — 2019 UPDATE

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Chromium (hexavalent)

Rincon Del Diablo MWD(ID-1)

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).

 

8

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND130ND
20130.0584 ppb880.0480 ppb - 0.0810 ppb
2014ND130ND
2015ND150ND
2016ND120ND
2017ND140ND

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
2013-03-203C21018-01A0.0480 ppb
2013-03-203C21018-03A0.0490 ppb
2013-06-18B3F1852-030.0810 ppb
2013-06-18B3F1852-010.0600 ppb
2013-09-10B3I0877-010.0580 ppb
2013-09-10B3I0877-030.0650 ppb
2013-12-10B3L1000-030.0580 ppb
2013-12-10B3L1000-010.0480 ppb