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EWG's Tap Water Database — 2019 UPDATE

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Manganese

City of Houston

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.

 

108

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201218.6 ppb555.20 ppb - 54.0 ppb
201313.8 ppb1211ND - 60.8 ppb
201411.7 ppb18181.000 ppb - 47.1 ppb
201516.0 ppb1716ND - 57.5 ppb
20167.57 ppb2919ND - 42.6 ppb
20178.57 ppb2720ND - 46.8 ppb

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
2012-01-31AB7946054.0 ppb
2012-02-01AB7970017.3 ppb
2012-04-10AB863815.20 ppb
2012-05-23AB908438.90 ppb
2012-07-24AB960317.80 ppb
2013-02-25AC1151360.8 ppb
2013-03-11AC12855ND
2013-06-13AC219816.80 ppb
2013-06-13AC219809.40 ppb
2013-08-08AC2716221.8 ppb
2013-08-08AC271582.50 ppb
2013-08-08AC2716113.4 ppb
2013-08-08AC2715711.4 ppb
2013-08-08AC2716010.3 ppb
2013-09-24AC3109213.1 ppb
2013-09-25AC312695.80 ppb
2013-10-29AC3358710.8 ppb
2014-02-03AC410095.20 ppb
2014-03-14AC470935.10 ppb
2014-03-14AC4709447.1 ppb
2014-03-14AC4709519.1 ppb
2014-04-16AC5078011.7 ppb
2014-04-16AC5078110.5 ppb
2014-04-17AC5102110.3 ppb
2014-06-03AC557684.90 ppb
2014-06-03AC557699.10 ppb
2014-07-15AC5967512.9 ppb
2014-07-15AC596747.10 ppb
2014-07-16AC598109.40 ppb
2014-08-14AC6364413.6 ppb
2014-10-08AC691511.000 ppb
2014-10-09AC693435.10 ppb
2014-10-09AC693429.70 ppb
2014-12-18AC7542121.1 ppb
2014-12-18AC754247.60 ppb
2015-03-04AC8282857.5 ppb
2015-03-05AC8283714.0 ppb
2015-06-04AC94569ND
2015-06-04AC945687.90 ppb
2015-06-04AC9456746.0 ppb
2015-06-04AC9456615.4 ppb
2015-06-04AC9456514.5 ppb
2015-07-21AD003175.00 ppb
2015-07-21AD0031529.4 ppb
2015-07-21AD0031610.1 ppb
2015-07-21AD0032214.5 ppb
2015-07-21AD0032010.6 ppb
2015-09-17AD074994.50 ppb
2015-10-22AD1144211.2 ppb
2015-10-22AD1144514.4 ppb
2015-10-22AD114448.70 ppb
2015-11-12AD133007.60 ppb
2016-02-18AD241981.50 ppb
2016-02-18AD24206ND
2016-02-18AD24189ND
2016-02-18AD24207ND
2016-02-18AD241977.60 ppb
2016-02-18AD2420511.8 ppb
2016-03-03AD268255.70 ppb
2016-03-16AD2898311.7 ppb
2016-03-16AD2897938.0 ppb
2016-03-17AD292968.50 ppb
2016-03-17AD292957.40 ppb
2016-03-23AD30057ND
2016-03-23AD3005912.3 ppb
2016-03-23AD30063ND
2016-03-23AD300584.80 ppb
2016-06-08AD39687ND
2016-06-08AD39686ND
2016-06-16AD40881ND
2016-06-16AD4087612.1 ppb
2016-09-20AD502735.60 ppb
2016-09-20AD502744.30 ppb
2016-09-21AD5063112.9 ppb
2016-10-06AD526209.60 ppb
2016-10-06AD52621ND
2016-10-06AD526243.50 ppb
2016-11-18AD5872516.1 ppb
2016-11-21AD587293.50 ppb
2016-11-21AD58730ND
2016-11-21AD5872842.6 ppb
2017-01-26AD67045ND
2017-01-26AD67054ND
2017-02-28AD723833.80 ppb
2017-02-28AD7238146.8 ppb
2017-03-01AD727083.60 ppb
2017-03-01AD727074.50 ppb
2017-03-02AD730253.80 ppb
2017-03-02AD730182.70 ppb
2017-03-28AD770826.60 ppb
2017-03-28AD77083ND
2017-03-28AD77081ND
2017-03-28AD77080ND
2017-03-29AD7738913.0 ppb
2017-03-29AD7738514.1 ppb
2017-04-26AD8110625.4 ppb
2017-04-27AD81406ND
2017-04-27AD8140711.6 ppb
2017-07-06AD8841828.2 ppb
2017-07-06AD88419ND
2017-07-06AD8842010.2 ppb
2017-07-25AD9048513.7 ppb
2017-09-11AD953981.10 ppb
2017-09-11AD9539411.9 ppb
2017-09-26AD979543.40 ppb
2017-09-26AD979598.50 ppb
2017-09-26AD979557.80 ppb
2017-11-07AE0378410.6 ppb