EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

City of 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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.643 ppb330.521 ppb - 0.707 ppb
20140.299 ppb440.273 ppb - 0.320 ppb
20150.320 ppb440.283 ppb - 0.381 ppb
20160.653 ppb330.480 ppb - 0.770 ppb
20170.433 ppb31ND - 1.30 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
2014-09-18Q14454970050.320 ppb
2014-09-18Q14454970010.297 ppb
2014-12-29Q14609010010.273 ppb
2014-12-29Q14609010050.307 ppb
2015-03-18Q15099890010.312 ppb
2015-03-18Q15099890050.381 ppb
2015-06-16Q15222040010.304 ppb
2015-06-16Q15222040050.283 ppb