Chromium (total)

Ocean Pines

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

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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	1.21 ppb	6	6	0.740 ppb - 1.60 ppb
2014	0.982 ppb	6	6	0.710 ppb - 1.40 ppb
2015	ND	4	0	ND
2016	ND	1	0	ND
2017	N/A	0	0	N/A
2018	0.840 ppb	5	3	ND - 1.90 ppb
2019	N/A	0	0	N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-11-12	35115909001AM	1.60 ppb
2013-11-12	35115905001AM	0.740 ppb
2013-11-12	35115903001AM	1.10 ppb
2013-11-13	35116107005AM	1.20 ppb
2013-11-13	35116107003AM	1.000 ppb
2013-12-31	35121424001AM	1.60 ppb
2014-05-14	35138224001AM	1.000 ppb
2014-05-14	35138176001AM	0.710 ppb
2014-05-14	35138218001AM	1.40 ppb
2014-05-14	35138174001AM	1.10 ppb
2014-05-15	35138178001AM	0.840 ppb
2014-05-15	35138178003AM	0.840 ppb
2015-09-23	L5828351_2	ND
2015-09-23	L58283551_3	ND
2015-09-23	L5862513_4	ND
2015-09-23	L582835_1	ND
2016-08-16	L6427530_5	ND
2018-10-10	0230005_1010_TP0	1.90 ppb
2018-10-10	0230005_101018_T	1.10 ppb
2018-10-10	0230005_101018_T	ND
2018-10-10	0230005_101018_T	ND
2018-10-10	OP101018_W3WELL3	1.20 ppb