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EWG's Tap Water Database

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Manganese

Clarksville Waterworks

Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND10ND
2011ND10ND
2012ND20ND
2013ND10ND
2014ND20ND
2015ND10ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 100 ppb

The health guideline of 100 ppb for manganese was defined by the state of Minnesota as a health risk limit, the concentration of a contaminant that can be consumed with little or no risk to health. This health guideline protects against harm to the brain and nervous system.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-01-04100070005ND
2011-01-04110060002ND
2012-01-04Y120060007ND
2012-01-04120060007ND
2013-01-03130040015ND
2014-02-26140580001ND
2014-03-10140720021ND
2015-02-02Y150370001ND