Chromium (total)

Northwest Park MUD

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.

MORE ABOUT THIS CONTAMINANT

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	0.974 ppb	10	10	0.544 ppb - 1.41 ppb
2014	0.880 ppb	14	10	ND - 1.66 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	ND	4	0	ND
2018	N/A	0	0	N/A
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
2013-11-11	Q1312692003	1.40 ppb
2013-11-11	Q1312692001	0.855 ppb
2013-11-11	Q1312692007	1.28 ppb
2013-11-11	Q1312692013	1.41 ppb
2013-11-11	Q1312692011	1.25 ppb
2013-11-11	Q1312692019	0.654 ppb
2013-11-11	Q1312692009	0.544 ppb
2013-11-11	Q1312692005	0.816 ppb
2013-11-11	Q1312692015	0.676 ppb
2013-11-11	Q1312692017	0.858 ppb
2014-01-14	AC38732	ND
2014-01-14	AC38731	ND
2014-01-14	AC38728	ND
2014-01-14	AC38735	ND
2014-05-14	Q1416010017	1.45 ppb
2014-05-14	Q1416010001	0.943 ppb
2014-05-14	Q1416010019	0.711 ppb
2014-05-14	Q1416010015	1.66 ppb
2014-05-14	Q1416010013	1.64 ppb
2014-05-14	Q1416010003	1.63 ppb
2014-05-14	Q1416010011	0.977 ppb
2014-05-14	Q1416010009	0.692 ppb
2014-05-14	Q1416010007	1.51 ppb
2014-05-14	Q1416010005	1.11 ppb
2017-04-28	AD81708	ND
2017-04-28	AD81714	ND
2017-04-28	AD81721	ND
2017-04-28	AD81715	ND