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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Los Angeles County WW District 4 & 34-Lancaster

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.

 

90

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201213.2 ppb4411.3 ppb - 15.2 ppb
20136.95 ppb3725ND - 35.9 ppb
20146.42 ppb2220ND - 14.6 ppb
201511.1 ppb3310.6 ppb - 11.7 ppb
20163.61 ppb165ND - 12.3 ppb
20176.38 ppb84ND - 16.0 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
2012-01-245442-053-090314.1 ppb
2012-01-245442-054-093711.3 ppb
2012-04-125442-054-101512.0 ppb
2012-11-145442-037-115715.2 ppb
2013-03-115442-011-093135.9 ppb
2013-03-115442-023-1045ND
2013-03-115442-016-1140ND
2013-03-115442-028-120512.1 ppb
2013-03-115442-062-1130ND
2013-03-125442-036-1106ND
2013-03-135442-035-085214.1 ppb
2013-03-135442-035-1159ND
2013-03-195442-002-113512.5 ppb
2013-03-195442-026-0925ND
2013-04-035442-063-0835ND
2013-04-095442-070-094511.0 ppb
2013-05-215442-040-090810.6 ppb
2013-06-045442-048-093410.5 ppb
2013-06-045442-041-0910ND
2013-06-125442-095-0859ND
2013-07-165442-045-1050ND
2013-07-175442-067-105012.1 ppb
2013-07-235442-071-1047ND
2013-07-245442-069-1002ND
2013-11-14201311150378AM1.20 ppb
2013-11-18201311210815AM8.30 ppb
2013-11-18201311200611AM15.0 ppb
2013-11-18201311200623AM10.00 ppb
2013-11-18201311210801AM5.50 ppb
2013-11-19201311250078AM11.0 ppb
2013-11-19201311250062AM8.90 ppb
2013-11-19201311220608AM4.90 ppb
2013-11-19201311220610AM10.00 ppb
2013-11-20201311270082AM8.00 ppb
2013-11-20201312020184AM5.60 ppb
2013-11-20201311270080AM12.0 ppb
2013-11-20201312020193AM8.50 ppb
2013-11-25201312030254AM13.0 ppb
2013-11-25201312040648AM11.0 ppb
2013-11-25201312030252AM5.20 ppb
2013-11-26201312040650AM0.320 ppb
2014-02-13201402140367AM2.90 ppb
2014-02-13201402140365AM1.30 ppb
2014-03-265442-055-103414.6 ppb
2014-04-215442-040-113510.9 ppb
2014-05-13201405160379AM7.60 ppb
2014-05-13201405160338AM10.00 ppb
2014-05-13201405160381AM11.0 ppb
2014-05-14201405160336AM6.40 ppb
2014-05-14201405190271AM12.0 ppb
2014-05-14201405190269AM7.90 ppb
2014-05-14201405160332AM5.20 ppb
2014-05-14201405160334AM0.660 ppb
2014-05-14201405220244AM12.0 ppb
2014-05-14201405160355AM2.00 ppb
2014-05-20201405230366AM12.0 ppb
2014-05-20201405220248AM9.30 ppb
2014-05-215442-094-0825ND
2014-05-27201405290650AM5.20 ppb
2014-05-27201405290654AM9.10 ppb
2014-06-265442-093-0850ND
2014-08-07201408120561AM0.620 ppb
2014-08-07201408120547AM0.560 ppb
2015-01-285442-053-091511.7 ppb
2015-04-135442-054-094011.0 ppb
2015-08-185442-037-093010.6 ppb
2016-01-195442-040-0945ND
2016-01-195442-035-0950ND
2016-01-255442-048-094010.4 ppb
2016-01-255442-062-0930ND
2016-01-255442-028-0840ND
2016-04-205442-041-0934ND
2016-06-275442-095-1050ND
2016-09-135442-070-100611.8 ppb
2016-09-135442-071-095512.0 ppb
2016-09-135442-069-0937ND
2016-09-135442-036-0950ND
2016-09-275442-067-082811.2 ppb
2016-11-085442-026-0900ND
2016-11-165442-023-1027ND
2016-11-165442-055-091212.3 ppb
2016-11-165442-016-1030ND
2017-09-269590-011-113016.0 ppb
2017-11-219590-063-101010.00 ppb
2017-11-219590-055-094015.0 ppb
2017-11-219590-045-0935ND
2017-12-279590-093-1115ND
2017-12-279590-094-0910ND
2017-12-279590-068-0935ND
2017-12-279590-063-101010.00 ppb