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EWG's Tap Water Database — 2021 UPDATE

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Manganese

San Jose Water Company

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

 

230

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.93 ppb302ND - 33.0 ppb
20155.08 ppb242ND - 89.0 ppb
20162.07 ppb413ND - 39.0 ppb
20171.23 ppb301ND - 37.0 ppb
20187.84 ppb253ND - 140.0 ppb
20191.90 ppb8028ND - 23.0 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
2014-01-071610-067-0905ND
2014-01-081610-136-0913ND
2014-01-131610-093-085033.0 ppb
2014-02-041610-002-0820ND
2014-02-041610-023-0915ND
2014-02-101610-173-1355ND
2014-03-041610-113-0925ND
2014-03-061610-178-0845ND
2014-03-071610-074-1020ND
2014-03-121610-170-0900ND
2014-03-121610-171-0930ND
2014-03-171610-141-1031ND
2014-04-031610-033-1050ND
2014-04-081610-086-1055ND
2014-05-021610-173-1200ND
2014-06-031610-169-0815ND
2014-06-101610-179-0915ND
2014-06-111610-108-0950ND
2014-07-081610-133-0912ND
2014-07-101610-172-1000ND
2014-08-061610-003-0820ND
2014-08-141610-114-0845ND
2014-08-181610-109-1005ND
2014-09-231610-027-0845ND
2014-11-031610-102-0859ND
2014-11-051610-030-123025.0 ppb
2014-11-051610-094-0940ND
2014-12-021610-068-1020ND
2014-12-031610-116-1250ND
2014-12-031610-138-0950ND
2015-01-071610-108-1140ND
2015-01-071610-175-1140ND
2015-01-131610-074-1108ND
2015-01-131610-085-0905ND
2015-03-031610-112-1105ND
2015-03-041610-024-1120ND
2015-03-051610-156-0922ND
2015-03-111610-125-0925ND
2015-03-121610-180-1006ND
2015-03-121610-183-121589.0 ppb
2015-04-081610-181-0915ND
2015-04-131610-016-093033.0 ppb
2015-05-141610-128-0846ND
2015-05-141610-130-0918ND
2015-06-031610-134-1022ND
2015-07-161610-116-0900ND
2015-07-211610-183-1015ND
2015-08-051610-072-1100ND
2015-08-131610-029-1020ND
2015-08-261610-156-1120ND
2015-09-021610-111-0840ND
2015-09-101610-183-0955ND
2015-09-241610-090-1145ND
2015-10-201610-126-0840ND
2016-01-071610-185-0955ND
2016-01-071610-186-0933ND
2016-01-121610-187-1410ND
2016-02-041610-107-1024ND
2016-02-041610-131-1130ND
2016-02-081610-142-0926ND
2016-02-081610-143-0935ND
2016-02-111610-004-0910ND
2016-02-181610-117-1202ND
2016-02-221610-031-0846ND
2016-02-221610-034-0910ND
2016-02-221610-183-123039.0 ppb
2016-02-231610-025-0900ND
2016-02-231610-085-1100ND
2016-02-241610-135-1055ND
2016-02-241610-137-1132ND
2016-02-251610-005-1230ND
2016-03-011610-070-1015ND
2016-03-011610-101-0920ND
2016-03-021610-093-0955ND
2016-03-021610-118-1350ND
2016-03-031610-088-0855ND
2016-03-171610-168-0930ND
2016-03-171610-176-1105ND
2016-03-281610-022-1332ND
2016-03-281610-129-1210ND
2016-03-281610-177-0940ND
2016-04-141610-184-0830ND
2016-05-041233-198-1200ND
2016-05-241610-075-1130ND
2016-06-141610-092-1015ND
2016-06-151610-144-1030ND
2016-06-151233-199-130030.0 ppb
2016-06-201610-093-1020ND
2016-06-231610-067-1100ND
2016-06-271610-183-0940ND
2016-07-251610-183-1100ND
2016-07-261233-198-1230ND
2016-08-251233-194-1200ND
2016-10-031233-196-1100ND
2016-12-151233-195-120016.0 ppb
2017-01-111610-108-0947ND
2017-01-111610-109-1010ND
2017-01-121610-002-0830ND
2017-01-171610-023-0920ND
2017-01-171610-027-0950ND
2017-01-171610-085-1150ND
2017-01-181610-068-1055ND
2017-01-181610-172-1335ND
2017-01-261610-086-1415ND
2017-01-261610-170-1115ND
2017-01-311610-094-1215ND
2017-01-311610-169-0805ND
2017-01-311610-178-1250ND
2017-01-311610-179-1520ND
2017-02-011610-173-135537.0 ppb
2017-02-021610-138-0900ND
2017-02-081610-133-1150ND
2017-02-161610-030-1130ND
2017-02-271610-172-1335ND
2017-03-221610-102-0800ND
2017-03-231610-171-0630ND
2017-03-281610-110-1130ND
2017-03-281610-141-0830ND
2017-03-291610-033-0830ND
2017-05-101610-003-0840ND
2017-05-241610-140-1020ND
2017-06-291610-136-1000ND
2017-09-281610-183-1125ND
2017-11-161610-183-1300ND
2017-12-141610-074-1350ND
2018-01-091610-030-1110ND
2018-01-101610-029-0905ND
2018-01-111610-156-0940ND
2018-01-171610-074-1305ND
2018-01-181610-126-1249ND
2018-01-181610-134-1200ND
2018-01-181610-137-1154ND
2018-01-221610-085-1057ND
2018-01-241610-101-1450ND
2018-01-241610-180-133532.0 ppb
2018-01-251610-125-1130ND
2018-01-251610-128-1200ND
2018-01-251610-130-1055ND
2018-01-251610-175-1345ND
2018-01-301610-142-0940ND
2018-01-311610-090-1115ND
2018-01-311610-181-1210ND
2018-02-011610-111-1010ND
2018-02-011610-183-122024.0 ppb
2018-02-071610-112-0924ND
2018-03-061610-024-1345ND
2018-04-261610-113-1310ND
2018-08-161610-114-1107ND
2018-08-161610-116-0935ND
2018-10-171610-074-1344140.0 ppb
2019-01-141610-074-1340ND
2019-01-15201901170109ND
2019-01-152019011701100.420 ppb
2019-01-15201901170111ND
2019-01-15201901170106ND
2019-01-161610-199-091522.0 ppb
2019-01-172019012201970.630 ppb
2019-01-172019012201955.60 ppb
2019-01-172019012201840.410 ppb
2019-01-17201901220198ND
2019-01-17201901220190ND
2019-01-17201901220207ND
2019-01-17201901220191ND
2019-01-222019012602180.970 ppb
2019-01-22201901260217ND
2019-01-231610-022-0910ND
2019-01-241610-025-1200ND
2019-01-241610-168-1325ND
2019-01-282019020201303.50 ppb
2019-01-282019020201312.70 ppb
2019-01-28201902020132ND
2019-01-301610-004-0900ND
2019-01-301610-070-0950ND
2019-01-301610-185-1152ND
2019-01-311610-085-084622.0 ppb
2019-02-051610-107-0905ND
2019-02-051610-108-0923ND
2019-02-051610-178-1200ND
2019-02-071610-117-1040ND
2019-02-141610-186-0932ND
2019-02-211610-088-0935ND
2019-02-211610-131-1000ND
2019-02-211610-176-1130ND
2019-02-281610-129-0945ND
2019-02-281610-143-0945ND
2019-03-061610-135-1130ND
2019-03-061610-144-1420ND
2019-03-071610-173-104523.0 ppb
2019-03-141610-177-1135ND
2019-03-141610-187-1335ND
2019-03-211610-031-1121ND
2019-03-211610-067-1315ND
2019-03-211610-184-1017ND
2019-03-251610-034-1100ND
2019-03-261610-136-1329ND
2019-03-261610-183-104423.0 ppb
2019-03-271610-093-1430ND
2019-04-022019040500621.50 ppb
2019-04-022019040500634.20 ppb
2019-04-032019040500641.70 ppb
2019-04-032019040500650.850 ppb
2019-04-032019040500660.840 ppb
2019-06-141610-183-0937ND
2019-07-082019071203440.840 ppb
2019-07-092019071203456.40 ppb
2019-07-102019071203846.70 ppb
2019-07-102019071203850.870 ppb
2019-07-102019071203860.500 ppb
2019-07-10201907120387ND
2019-07-10201907120388ND
2019-07-22201907260193ND
2019-07-22201907260191ND
2019-07-23201907230430ND
2019-07-232019072304310.440 ppb
2019-07-23201907230425ND
2019-07-23201907230427ND
2019-07-232019072304280.480 ppb
2019-07-232019072304291.10 ppb
2019-07-23201907230426ND
2019-07-24201907260190ND
2019-07-24201907260192ND
2019-08-011610-183-1021ND
2019-10-232019102502943.90 ppb
2019-10-232019102502982.20 ppb
2019-10-232019102502990.500 ppb
2019-10-23201910250300ND
2019-11-061610-183-145915.0 ppb
2019-12-121610-141-0855ND
2019-12-121610-142-1000ND
2019-12-161610-144-0915ND