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.
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 |