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EWG's Tap Water Database — 2019 UPDATE

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Manganese

San Francisco Regional Water System

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND30ND
2015ND30ND
2016ND30ND
2017ND30ND

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
2012-06-139553-001-1045ND
2012-06-139553-015-1220ND
2012-07-249553-016-0915ND
2013-06-189553-016-0936ND
2013-06-189553-001-1110ND
2013-10-079553-015-1024ND
2014-06-179553-001-1130ND
2014-06-179553-016-0904ND
2014-09-169553-015-1035ND
2015-05-279553-001-1235ND
2015-05-279553-016-0830ND
2015-06-189553-015-0915ND
2016-06-149553-015-1231ND
2016-06-149553-001-1105ND
2016-06-219553-016-1055ND
2017-06-199553-015-1100ND
2017-06-199553-001-1025ND
2017-06-199553-016-0953ND