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Chromium (total)

Portland Water Bureau

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND20ND
20110.150 ppb21ND - 0.300 ppb
2012ND20ND
2013ND10ND
20140.0860 ppb104ND - 0.240 ppb
2015ND20ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)100 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-04-13K1003546001-IND
2010-08-11K1008507001-IND
2011-01-18K1100533001-I0.300 ppb
2011-04-12K1103204001-IND
2012-01-22K1200717001-IND
2012-04-10BB16085-IND
2013-04-09BB26971-IND
2014-03-19201403200340AMND
2014-03-19201403200265AMND
2014-04-08BB38036-IND
2014-06-26201406270313AMND
2014-06-26201406270434AMND
2014-07-08BB42035-IND
2014-09-11201409120957AM0.220 ppb
2014-09-11201409120826AM0.200 ppb
2014-12-10201412110822AM0.240 ppb
2014-12-10201412110612AM0.200 ppb
2015-03-31BB49816-IND
2015-06-17BB52444-IND