Chromium (total)

Metropolitan DWID

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

118

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	0.179 ppb	67	36	ND - 0.710 ppb
2015	0.379 ppb	44	42	ND - 1.70 ppb
2016	N/A	0	0	N/A
2017	0.867 ppb	6	2	ND - 2.90 ppb
2018	ND	1	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
2014-08-06	201408070497AM	ND
2014-08-06	201408070495AM	0.530 ppb
2014-08-11	201408120147AM	0.320 ppb
2014-08-11	201408120151AM	0.310 ppb
2014-08-11	201408120137AM	0.360 ppb
2014-08-11	201408120139AM	0.450 ppb
2014-08-11	201408120149AM	0.300 ppb
2014-08-11	201408120145AM	0.340 ppb
2014-08-11	201408120141AM	0.520 ppb
2014-08-11	201408120143AM	0.500 ppb
2014-08-12	201408130502AM	0.330 ppb
2014-08-12	201408130504AM	0.280 ppb
2014-08-12	201408130498AM	0.250 ppb
2014-08-12	201408130506AM	0.350 ppb
2014-08-12	201408130508AM	0.210 ppb
2014-08-12	201408130500AM	0.250 ppb
2014-08-12	201408130512AM	0.340 ppb
2014-08-12	201408130510AM	0.230 ppb
2014-08-14	201408150342AM	0.260 ppb
2014-08-14	201408150340AM	0.360 ppb
2014-08-14	201408150338AM	0.300 ppb
2014-08-14	201408150336AM	0.320 ppb
2014-08-14	201408150334AM	0.240 ppb
2014-08-18	201408190663AM	0.290 ppb
2014-08-18	201408190665AM	0.360 ppb
2014-08-18	201408190667AM	0.270 ppb
2014-08-18	201408190496AM	0.230 ppb
2014-08-18	201408190498AM	0.200 ppb
2014-08-18	201408190500AM	0.220 ppb
2014-08-19	201408200415AM	ND
2014-08-19	201408200417AM	0.200 ppb
2014-08-19	201408200433AM	ND
2014-08-19	201408200435AM	ND
2014-08-19	201408200419AM	0.200 ppb
2014-08-19	201408200437AM	ND
2014-08-19	201408200439AM	ND
2014-08-20	201408210482AM	0.310 ppb
2014-08-20	201408210488AM	0.380 ppb
2014-08-20	201408210484AM	ND
2014-08-20	201408210490AM	ND
2014-08-20	201408210480AM	0.710 ppb
2014-08-20	201408210492AM	0.550 ppb
2014-08-25	201408260297AM	0.250 ppb
2014-09-22	201409230534AM	0.470 ppb
2014-10-14	14J0544-01(2I)	ND
2014-10-14	14J0544-02(2I)	ND
2014-10-14	14J0544-03(2I)	ND
2014-10-14	14J0544-04(2I)	ND
2014-10-14	14J0544-05(2I)	ND
2014-10-15	14J0566-01(2I)	ND
2014-10-15	14J0566-02(2I)	ND
2014-10-15	14J0566-03(2I)	ND
2014-10-15	14J0566-04(2I)	ND
2014-10-15	14J0566-05(2I)	ND
2014-10-21	14J0681-01(2I)	ND
2014-10-21	14J0685-01(2I)	ND
2014-10-21	14J0685-02(2I)	ND
2014-10-21	14J0685-03(2I)	ND
2014-10-21	14J0685-04(2I)	ND
2014-10-21	14J0685-05(2I)	ND
2014-10-21	14J0685-06(2I)	ND
2014-10-21	14J0685-07(2I)	ND
2014-10-22	14J0707-01(2I)	ND
2014-10-22	14J0707-02(2I)	ND
2014-10-22	14J0707-03(2I)	ND
2014-10-22	14J0707-04(2I)	ND
2014-10-22	14J0707-05(2I)	ND
2015-02-17	201502180766AM	0.430 ppb
2015-02-17	201502180795AM	0.240 ppb
2015-02-17	201502180797AM	0.390 ppb
2015-02-17	201502180793AM	0.280 ppb
2015-02-17	201502180791AM	1.70 ppb
2015-02-17	201502180768AM	0.500 ppb
2015-02-17	201502180770AM	0.440 ppb
2015-02-18	201502190759AM	0.230 ppb
2015-02-18	201502190757AM	0.370 ppb
2015-02-18	201502190761AM	1.70 ppb
2015-02-18	201502190763AM	0.260 ppb
2015-02-18	201502190977AM	0.250 ppb
2015-02-18	201502190975AM	0.250 ppb
2015-02-19	201502200382AM	0.220 ppb
2015-02-19	201502200384AM	0.200 ppb
2015-02-19	201502200209AM	0.220 ppb
2015-02-19	201502200386AM	ND
2015-02-19	201502200211AM	0.290 ppb
2015-02-19	201502200213AM	0.270 ppb
2015-02-19	201502200207AM	0.320 ppb
2015-02-23	201502240512AM	0.310 ppb
2015-02-23	201502240510AM	0.320 ppb
2015-02-23	201502240502AM	0.420 ppb
2015-02-23	201502240506AM	0.460 ppb
2015-02-23	201502240508AM	0.350 ppb
2015-02-23	201502240514AM	0.300 ppb
2015-02-23	201502240516AM	0.300 ppb
2015-02-23	201502240504AM	0.400 ppb
2015-02-24	201502250596AM	0.400 ppb
2015-02-24	201502250598AM	0.280 ppb
2015-02-24	201502250602AM	0.470 ppb
2015-02-24	201502250600AM	0.330 ppb
2015-02-24	201502250594AM	0.290 ppb
2015-02-24	201502250588AM	0.290 ppb
2015-02-24	201502250592AM	0.340 ppb
2015-02-24	201502250590AM	0.240 ppb
2015-02-24	201502250889AM	ND
2015-02-24	201502250887AM	1.000 ppb
2015-02-25	201502260401AM	0.250 ppb
2015-02-25	201502260405AM	0.250 ppb
2015-02-25	201502260399AM	0.310 ppb
2015-02-25	201502260403AM	0.290 ppb
2015-02-25	201502260397AM	0.330 ppb
2015-08-31	201509010996AM	0.200 ppb
2017-08-16	17H0609-01(2I)	2.30 ppb
2017-08-16	17H0609-02(2I)	2.90 ppb
2017-10-24	550-92026-1	ND
2017-10-24	550-92026-2	ND
2017-10-24	550-92026-3	ND
2017-10-24	550-92026-4	ND
2018-05-02	20180507088 I	ND