EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

City of Sweetwater

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
20130.834 ppb110.834 ppb
20142.96 ppb330.237 ppb - 8.40 ppb
20150.435 ppb76ND - 1.50 ppb
20161.20 ppb111.20 ppb
20172.10 ppb112.10 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
2013-06-04Q13018330110.834 ppb
2014-05-06Q14147270018.40 ppb
2014-12-18Q14605580030.237 ppb
2014-12-18Q14605580010.240 ppb
2015-02-11Q15057780021.50 ppb
2015-03-25Q15110690010.295 ppb
2015-03-25Q15110690030.274 ppb
2015-06-17Q15225180010.346 ppb
2015-06-17Q15225180030.425 ppb
2015-09-23Q15372800010.203 ppb
2016-02-03Q16046960111.20 ppb
2017-02-21Q17072860042.10 ppb