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EWG's Tap Water Database — 2021 UPDATE

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Manganese

Walnut Creek SUD

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.

MORE ABOUT THIS CONTAMINANT

 

64

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND10ND
2015ND10ND
2016ND10ND
2017ND10ND
2018ND470ND
2019ND130ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 100 ppb

The EWG 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
2014-02-26Q1406368007ND
2015-03-03Q1507940007ND
2016-02-29Q1608183002ND
2017-02-13Q1706085005ND
2018-02-15Q1806665002ND
2018-02-267582810010ND
2018-02-267582810003ND
2018-02-267582810004ND
2018-02-267582810005ND
2018-02-267582810006ND
2018-02-267582810001ND
2018-02-267582810008ND
2018-02-267582810011ND
2018-02-267582810007ND
2018-02-267582810002ND
2018-02-267582810009ND
2018-05-307588334008ND
2018-05-307588334011ND
2018-05-307588334002ND
2018-05-307588334003ND
2018-05-307588334004ND
2018-05-307588334005ND
2018-05-307588334010ND
2018-05-307588334007ND
2018-05-307588334009ND
2018-05-307588334001ND
2018-05-307588334006ND
2018-07-2335406258001SEA1ND
2018-09-067594104007ND
2018-09-067594104010ND
2018-09-067594104002ND
2018-09-067594104004ND
2018-09-067594104001ND
2018-09-067594104005ND
2018-09-067594104006ND
2018-09-067594104003ND
2018-09-067594104008ND
2018-09-067594104009ND
2018-09-067594104011ND
2018-10-1635424613001SEA2ND
2018-11-077597945005ND
2018-11-077597945004ND
2018-11-077597945003ND
2018-11-077597946002ND
2018-11-077597946001ND
2018-11-077597945002ND
2018-11-077597945001ND
2018-11-077597946006ND
2018-11-077597946005ND
2018-11-077597946003ND
2018-11-077597946004ND
2019-01-22Q1903073002ND
2019-01-2875102294010ND
2019-01-2875102294001ND
2019-01-2875102294002ND
2019-01-2875102294003ND
2019-01-2875102294004ND
2019-01-2875102294005ND
2019-01-2875102294006ND
2019-01-2875102294007ND
2019-01-2875102294008ND
2019-01-2875102294009ND
2019-01-2875102294011ND
2019-04-2335463698001SEA4ND