Chromium (total)

Cross Valley Water District

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	0.254 ppb	16	4	ND - 1.20 ppb
2014	ND	1	0	ND
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	0.400 ppb	5	2	ND - 1.000 ppb

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
2013-04-03	WA97-SE1-1300536	ND
2013-04-03	WA97-SE1-13-0536	ND
2013-04-03	WA97-SE1-13-0536	1.000 ppb
2013-04-03	WA97-SE1-13-0536	1.20 ppb
2013-04-03	WA97-SE1-13-0536	ND
2013-04-03	WA97-SE1-13-0536	ND
2013-04-03	WA97-SE1-13-0536	ND
2013-04-03	WA97-SE1-13-0536	ND
2013-10-09	WA97-SE2-13-1948	ND
2013-10-09	WA97-SE2-13-1948	ND
2013-10-09	WA97-SE2-13-1948	0.896 ppb
2013-10-09	WA97-SE2-13-1948	ND
2013-10-09	WA97-SE2-13-1948	ND
2013-10-09	WA97-SE2-13-1948	ND
2013-10-09	WA97-SE2-13-1948	0.970 ppb
2013-10-09	WA97-SE2-13-1948	ND
2014-10-14	46279	ND
2019-04-09		1.000 ppb
2019-04-09		ND
2019-04-09		ND
2019-04-09		1.000 ppb
2019-04-09		ND