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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

El Dorado ID - Main

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND150ND
2014N/A00N/A
2015N/A00N/A
2016ND30ND
2017ND10ND
2018ND30ND
2019ND30ND

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
2013-01-23201301240178AMND
2013-01-23201301240170AMND
2013-01-29201301300031AMND
2013-04-17201304180573AMND
2013-04-17201304180523AMND
2013-04-17201304180504AMND
2013-04-17201304180506AMND
2013-07-10201307110741AMND
2013-07-10201307110750AMND
2013-07-10201307110737AMND
2013-07-31201308010355AMND
2013-09-24201309250084AMND
2013-10-16201310170160AMND
2013-10-16201310170158AMND
2013-10-16201310170156AMND
2016-07-129590-002-1100ND
2016-07-219590-004-1240ND
2016-07-219590-003-0945ND
2017-07-119590-007-1130ND
2018-07-029590-005-1106ND
2018-07-109590-007-1055ND
2018-07-119590-006-1145ND
2019-07-029590-004-1200ND
2019-07-029590-003-0915ND
2019-07-169590-002-1000ND