Chromium (hexavalent)

Del Oro Water Company - Paradise Pines

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

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	0.604 ppb	16	15	ND - 0.900 ppb
2014	0.575 ppb	4	2	ND - 1.20 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	ND	4	0	ND
2018	N/A	0	0	N/A
2019	N/A	0	0	N/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
2013-03-12	B3C1330-01A	0.760 ppb
2013-03-12	B3C1331-03A	0.740 ppb
2013-03-12	B3C1330-07A	0.630 ppb
2013-03-19	B3C2086-03	0.710 ppb
2013-03-19	B3C2086-01	0.350 ppb
2013-03-19	B3C2086-02	0.800 ppb
2013-03-19	B3C2086-05	0.660 ppb
2013-03-19	B3C2086-04	0.830 ppb
2013-09-10	B3I1014-09	0.110 ppb
2013-09-10	B3I1014-03	0.890 ppb
2013-09-10	B3I1014-05	0.760 ppb
2013-09-10	B3I1014-11	0.900 ppb
2013-09-10	B3I1014-15	0.550 ppb
2013-09-10	B3I1014-13	0.250 ppb
2013-09-10	B3I1014-07	0.730 ppb
2013-09-24	B3I2386-01	ND
2014-09-23	2119-006-1100	ND
2014-09-23	2119-005-0615	1.20 ppb
2014-09-23	2119-004-0600	ND
2014-09-23	2119-002-0645	1.10 ppb
2017-10-31	1233-002-0800	ND
2017-10-31	1233-006-0630	ND
2017-10-31	1233-005-0700	ND
2017-10-31	1233-004-0645	ND