Chromium (total)

Pritchett Water Supply Corporation

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	1.86 ppb	10	5	ND - 15.3 ppb
2015	N/A	0	0	N/A
2016	2.13 ppb	3	3	2.00 ppb - 2.40 ppb
2017	0.360 ppb	10	3	ND - 1.30 ppb
2018	N/A	0	0	N/A
2019	1.83 ppb	3	3	1.60 ppb - 2.10 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
2014-01-22	Q1402022011	0.815 ppb
2014-01-22	Q1402022010	0.922 ppb
2014-01-22	Q1402022009	0.664 ppb
2014-01-22	Q1402022008	15.3 ppb
2014-01-22	Q1402022007	0.892 ppb
2014-06-25	Q1423783023	ND
2014-06-25	Q1423783022	ND
2014-06-25	Q1423783021	ND
2014-06-25	Q1423783020	ND
2014-06-25	Q1423783019	ND
2016-10-24	Q1645066022	2.40 ppb
2016-10-24	Q1645066030	2.00 ppb
2016-10-24	Q1645066003	2.00 ppb
2017-03-02	Q1709045002	1.20 ppb
2017-06-13	Q1724796001	1.30 ppb
2017-08-29	Q1739153017	1.10 ppb
2017-08-29	Q1739153004	ND
2017-08-29	Q1739153016	ND
2017-08-29	Q1739153003	ND
2017-08-29	Q1739153015	ND
2017-08-29	Q1739153002	ND
2017-08-29	Q1739153014	ND
2017-08-30	Q1739907012	ND
2019-10-15	Q1972651008	2.10 ppb
2019-10-15	Q1972651009	1.80 ppb
2019-10-15	Q1972651040	1.60 ppb