Chromium (total)

Farmington Water System

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
2014	0.151 ppb	16	7	ND - 0.730 ppb
2015	ND	4	0	ND
2016	ND	2	0	ND
2017	ND	2	0	ND
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
2014-03-18	201403190622AM	ND
2014-03-18	201403190628AM	ND
2014-04-08	201404090539AM	ND
2014-04-08	201404090425AM	ND
2014-06-17	201406180489AM	ND
2014-06-17	201406180290AM	0.240 ppb
2014-07-08	201407090720AM	ND
2014-07-08	201407090888AM	ND
2014-07-15	1407751-004A	ND
2014-07-15	1407748-006A	ND
2014-09-16	201409170864AM	0.410 ppb
2014-09-16	201409180251AM	0.730 ppb
2014-11-06	201411070472AM	0.240 ppb
2014-11-24	201411250299AM	0.250 ppb
2014-12-16	201412180332AM	0.250 ppb
2014-12-16	201412170448AM	0.290 ppb
2015-01-13	201501140774AM	ND
2015-01-13	201501140616AM	ND
2015-07-14	1507762-004A	ND
2015-07-14	1507761-004A	ND
2016-07-06	1607290-004A	ND
2016-07-06	1607287-004A	ND
2017-07-12	1707698-004	ND
2017-07-12	1707700-004	ND
2018-07-10	1807648-005	ND
2018-07-10	1807632-005	ND
2019-07-10	1907575-004	ND
2019-07-10	1907577-004	ND