Chromium (hexavalent)

Locust Valley Water District

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
2014	1.19 ppb	12	11	ND - 1.80 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	1.12 ppb	5	5	0.470 ppb - 1.90 ppb
2018	1.22 ppb	5	5	0.510 ppb - 2.10 ppb
2019	1.73 ppb	4	4	1.40 ppb - 2.10 ppb

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
2014-03-17	105941P	1.75 ppb
2014-03-17	105942P	1.52 ppb
2014-03-17	305861P	1.51 ppb
2014-03-17	105940P	1.46 ppb
2014-03-17	105944P	0.843 ppb
2014-03-17	105943P	0.469 ppb
2014-09-22	309160P	1.69 ppb
2014-09-22	109089P	1.48 ppb
2014-09-22	109087P	1.34 ppb
2014-09-22	109090P	0.485 ppb
2014-09-22	109091P	ND
2014-09-23	109088P	1.80 ppb
2017-08-22	7027930001-PRI	1.30 ppb
2017-08-28	7028364001-RAD	1.90 ppb
2017-08-30	7028533001-RAD	0.520 ppb
2017-09-05	7028854001-RAD	1.40 ppb
2017-09-11	7029448001-RAD	0.470 ppb
2018-08-13	7061326002	1.40 ppb
2018-08-13	7061326001-PRI	0.680 ppb
2018-08-21	7062227001-PRI	2.10 ppb
2018-08-27	7062839004-PRI	1.40 ppb
2018-09-10	706417701-PRI	0.510 ppb
2019-08-21	7062227001-PRI	2.10 ppb
2019-08-27	70102885001-PRI	1.40 ppb
2019-09-03	70103457001-PRI	1.60 ppb
2019-09-03	70103457002	1.80 ppb