Chromium (total)

City of Arlington

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	ND	4	0	ND
2014	0.169 ppb	13	2	ND - 1.66 ppb
2015	0.880 ppb	2	2	0.760 ppb - 1.000 ppb
2016	0.500 ppb	2	1	ND - 1.000 ppb
2017	0.550 ppb	2	1	ND - 1.10 ppb
2018	ND	2	0	ND
2019	ND	2	0	ND

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
2013-11-19	Q1313799001	ND
2013-11-19	Q1313799011	ND
2013-11-19	Q1313799009	ND
2013-11-19	Q1313799003	ND
2014-02-11	Q1404025017	1.66 ppb
2014-02-25	Q1405942005	ND
2014-02-25	Q1405942007	ND
2014-02-25	Q1405942001	ND
2014-04-30	Q1413772002	0.540 ppb
2014-05-28	Q1418071011	ND
2014-05-28	Q1418071009	ND
2014-05-28	Q1418071003	ND
2014-07-16	Q1428155001	ND
2014-08-28	Q1440005003	ND
2014-08-28	Q1440005011	ND
2014-08-28	Q1440005009	ND
2014-08-28	Q1440005001	ND
2015-01-21	Q1502500004	0.760 ppb
2015-04-28	Q1515602002	1.000 ppb
2016-01-06	Q1600353016	ND
2016-04-13	Q1614685002	1.000 ppb
2017-01-24	Q1703096001	1.10 ppb
2017-06-26	Q1726565004	ND
2018-01-23	Q1802577003	ND
2018-06-14	Q1823825004	ND
2019-02-20	Q1907393013	ND
2019-04-10	Q1914375004	ND