Chromium (total)

Arroyo Grande,Water Department

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	ND	5	0	ND
2015	0.0306 ppb	16	2	ND - 0.250 ppb
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	ND	8	0	ND
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
2014-03-18	3761-013-0930	ND
2014-12-16	A4L0783-04A	ND
2014-12-16	A4L0783-01A	ND
2014-12-16	A4L0783-10A	ND
2014-12-16	A4L0783-07A	ND
2015-03-17	A5B1826-01A	ND
2015-03-17	A5B1826-04A	ND
2015-05-19	3761-013-1015	ND
2015-05-19	3761-001-0912	ND
2015-05-19	3761-008-1035	ND
2015-05-19	3761-007-0830	ND
2015-05-19	3761-002-0915	ND
2015-05-19	3761-006-0827	ND
2015-05-19	3761-004-0855	ND
2015-05-19	3761-003-0922	ND
2015-06-16	A5F0172-07A	0.240 ppb
2015-06-16	A5F0172-04A	ND
2015-06-16	A5F0172-10A	ND
2015-06-17	A5F0172-01A	ND
2015-09-22	A5H2567-01A	0.250 ppb
2015-09-22	A5H2567-04A	ND
2018-05-08	3761-001-0950	ND
2018-05-08	3761-002-0850	ND
2018-05-08	3761-003-1010	ND
2018-05-08	3761-004-0818	ND
2018-05-08	3761-013-0850	ND
2018-05-08	3761-008-0940	ND
2018-05-08	3761-006-0910	ND
2018-05-08	3761-007-0930	ND