EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

Lehigh County Authority Allentown Division

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20121.85 ppb21ND - 3.70 ppb
20131.43 ppb880.579 ppb - 3.60 ppb
20141.02 ppb880.452 ppb - 2.00 ppb
20152.50 ppb222.00 ppb - 3.00 ppb
20162.00 ppb222.00 ppb
20172.50 ppb222.00 ppb - 3.00 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
2012-07-12L4243701-23.70 ppb
2013-02-07L4488090-13.50 ppb
2013-02-07L4488090-23.60 ppb
2013-07-22732600-93610.601 ppb
2013-07-22732604-93610.868 ppb
2013-07-22732602-93610.579 ppb
2013-10-09751815-100930.938 ppb
2013-10-09751811-100930.809 ppb
2013-10-09751813-100930.582 ppb
2014-01-15766744-106750.452 ppb
2014-01-15766742-106380.628 ppb
2014-01-15766746-106750.661 ppb
2014-04-2214040706-020.900 ppb
2014-04-2214040706-030.800 ppb
2014-04-2214040706-010.700 ppb
2014-05-2014050158-012.00 ppb
2014-05-2014050157-012.00 ppb
2015-08-07131708642.00 ppb
2015-08-07131708763.00 ppb
2016-08-16147847392.00 ppb
2016-08-16147847272.00 ppb
2017-08-15166117643.00 ppb
2017-08-15166117522.00 ppb