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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Ridgeland

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20124.85 ppb553.56 ppb - 5.81 ppb
20138.10 ppb118.10 ppb
20141.36 ppb71ND - 9.50 ppb
20150.0818 ppb111ND - 0.900 ppb
20161.30 ppb111.30 ppb
2017N/A00N/A

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
2012-07-09120710-020IN5.42 ppb
2012-07-09120710-017IN5.16 ppb
2012-07-09120710-016IN5.81 ppb
2012-07-09120710-019IN4.31 ppb
2012-07-09120710-018IN3.56 ppb
2013-04-30130501-001IN8.10 ppb
2014-03-31140401-013IN9.50 ppb
2014-08-26813564-12345ND
2014-08-26813568-12345ND
2014-08-26813562-12345ND
2014-08-26813566-12345ND
2014-09-08816767-12361ND
2014-09-29823195-12571ND
2015-02-18844450-13477ND
2015-02-18844454-13477ND
2015-02-18844458-13477ND
2015-02-18844460-13477ND
2015-02-18844452-13477ND
2015-03-10847557-13628ND
2015-11-23151124-019INND
2015-11-23151124-020IN0.900 ppb
2015-11-23151124-023INND
2015-11-23151124-021INND
2015-11-23151124-022INND
2016-02-29160301-043IN1.30 ppb