Chromium (total)

Bastrop 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
2013	0.988 ppb	8	8	0.900 ppb - 1.10 ppb
2014	N/A	0	0	N/A
2015	0.700 ppb	8	2	ND - 2.80 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
2013-03-05	2788989	0.900 ppb
2013-03-05	2788840	1.000 ppb
2013-03-05	2788827	1.000 ppb
2013-04-03	2803118	0.900 ppb
2013-09-04	2890119	1.10 ppb
2013-09-04	2889931	1.10 ppb
2013-09-04	2889956	1.000 ppb
2013-09-04	2890124	0.900 ppb
2015-03-16	35179946001	ND
2015-03-16	35179946004	2.80 ppb
2015-03-16	35179946003	ND
2015-03-16	35179946002	ND
2015-03-16	35179946004	2.80 ppb
2015-03-16	35179946003	ND
2015-03-16	35179946002	ND
2015-03-16	35179946001	ND
2018-01-30	35371327003	ND
2018-01-30	35371327002	ND
2018-01-30	35371327001	ND
2018-01-30	35371327003	ND
2018-01-30	35371327002	ND
2018-01-30	35371327001	ND
2018-02-05	35373310001	ND
2018-02-05	35373310001	ND