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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Northwestern W and Sd-wtln 200

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for chromium (total). Sample information shown below was taken by Oregon City.

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
20140.186 ppb74ND - 0.460 ppb
20150.0967 ppb31ND - 0.290 ppb
2016ND10ND
2017ND10ND

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

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for chromium (total). Sample information shown below was taken by Oregon City.

Date Lab ID Result
2012-06-14AG23311ND
2013-06-14AG47916ND
2014-04-14201404210200AMND
2014-04-15201404210198AMND
2014-06-04AG72036ND
2014-07-15201407180207AM0.200 ppb
2014-07-15201407180209AM0.230 ppb
2014-10-13201410210076AM0.410 ppb
2014-10-13201410210078AM0.460 ppb
2015-01-16201501230329AM0.290 ppb
2015-01-16201501230331AMND
2015-06-25AG99783ND
2016-06-09AH23557ND
2017-06-19AH52591ND