Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Mercury (inorganic)

California American Water Company - Monterey

Mercury is a potent neurotoxin that also damages the kidneys and other internal organs. Mercury enters drinking water from industrial pollution, mining wastes and coal-fired power plants.

MORE ABOUT THIS CONTAMINANT

 

190

Samples

4

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.26 ppb125ND - 4.50 ppb
20150.331 ppb132ND - 2.60 ppb
20160.0186 ppb861ND - 1.60 ppb
2017ND30ND
2018ND310ND
2019ND450ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1.2 ppb

The EWG Health Guideline of 1.2 ppb for mercury (inorganic) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 2 ppb

The legal limit for inorganic mercury, established in 1991, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-211225-089-11404.30 ppb
2014-01-221225-092-11451.10 ppb
2014-02-111225-089-11203.90 ppb
2014-02-121225-092-1140ND
2014-02-181225-054-1225ND
2014-04-081225-082-1125ND
2014-04-101225-061-1250ND
2014-04-241225-092-10051.30 ppb
2014-04-291225-089-10304.50 ppb
2014-05-051225-079-1420ND
2014-06-111225-053-1000ND
2014-12-231225-085-0915ND
2015-02-101225-085-1330ND
2015-04-091225-082-0935ND
2015-07-151225-070-1045ND
2015-07-211225-070-1300ND
2015-07-241225-070-1045ND
2015-07-291225-070-11462.60 ppb
2015-07-291225-070-1150ND
2015-07-291225-070-1200ND
2015-07-291225-070-1215ND
2015-08-071225-070-10261.70 ppb
2015-08-071225-070-1030ND
2015-08-071225-070-1040ND
2015-08-071225-070-1055ND
2016-01-071225-085-1505ND
2016-01-121225-046-1355ND
2016-01-205810-087-1055ND
2016-02-081225-016-1030ND
2016-02-081225-017-1000ND
2016-02-081225-044-1230ND
2016-02-081225-045-1200ND
2016-02-081225-047-1100ND
2016-04-061225-024-1410ND
2016-04-071225-082-1010ND
2016-04-191225-029-1000ND
2016-04-191225-051-1100ND
2016-04-261225-048-1115ND
2016-05-121225-052-1010ND
2016-06-071225-026-1045ND
2016-06-071225-072-1000ND
2016-06-071225-073-1020ND
2016-06-081225-002-1330ND
2016-06-081225-006-1300ND
2016-06-081225-074-1315ND
2016-07-141225-088-11151.60 ppb
2016-07-141225-088-1121ND
2016-07-141225-088-1145ND
2016-07-141225-088-1215ND
2016-07-281225-070-1340ND
2016-08-031225-070-1805ND
2016-08-041225-070-1935ND
2016-08-051225-070-1350ND
2016-08-121225-070-1243ND
2016-08-191225-088-1715ND
2016-08-191225-088-1725ND
2016-08-191225-088-1745ND
2016-08-221225-070-1010ND
2016-08-241225-070-1437ND
2016-08-241225-088-1415ND
2016-08-241225-088-1425ND
2016-08-241225-088-1435ND
2016-08-291225-050-1215ND
2016-09-011225-070-1431ND
2016-09-011225-088-1410ND
2016-09-011225-088-1420ND
2016-09-011225-088-1430ND
2016-09-061225-070-1330ND
2016-09-131225-070-1110ND
2016-09-191225-070-1116ND
2016-09-191225-088-1055ND
2016-09-191225-088-1105ND
2016-09-191225-088-1115ND
2016-09-241225-070-1403ND
2016-09-241225-088-1255ND
2016-09-241225-088-1305ND
2016-09-241225-088-1315ND
2016-09-261225-070-1450ND
2016-09-271225-070-1531ND
2016-09-271225-088-1510ND
2016-09-271225-088-1520ND
2016-09-271225-088-1530ND
2016-10-041225-070-1315ND
2016-10-071225-070-1106ND
2016-10-071225-088-1045ND
2016-10-071225-088-1055ND
2016-10-071225-088-1105ND
2016-10-121225-070-1325ND
2016-10-241225-070-1045ND
2016-10-241225-088-0950ND
2016-10-241225-088-1000ND
2016-10-241225-088-1010ND
2016-11-061225-088-1740ND
2016-11-061225-088-1750ND
2016-11-061225-088-1800ND
2016-11-141225-088-0910ND
2016-11-141225-088-0920ND
2016-11-141225-088-0930ND
2016-11-181225-070-1305ND
2016-11-211225-070-1115ND
2016-11-251225-070-1008ND
2016-11-251225-088-0940ND
2016-11-251225-088-0950ND
2016-11-251225-088-1000ND
2016-11-281225-070-1345ND
2016-12-091225-070-1048ND
2016-12-091225-088-1025ND
2016-12-091225-088-1035ND
2016-12-091225-088-1045ND
2016-12-121225-070-0930ND
2016-12-201225-085-1135ND
2017-04-171225-082-1045ND
2017-08-011225-070-1230ND
2017-08-241225-088-1020ND
2018-05-011225-082-0920ND
2018-05-011225-088-0930ND
2018-06-301225-070-0950ND
2018-06-301225-070-1055ND
2018-07-091225-070-1005ND
2018-07-101225-070-1040ND
2018-08-031225-070-1335ND
2018-08-161225-070-0910ND
2018-09-241225-070-1003ND
2018-10-251225-070-1000ND
2018-10-311225-070-1100ND
2018-11-051225-070-1320ND
2018-11-131225-070-1020ND
2018-11-191225-070-1308ND
2018-11-291225-070-1130ND
2018-12-031225-070-1145ND
2018-12-061225-092-1159ND
2018-12-061225-092-1200ND
2018-12-061225-092-1204ND
2018-12-061225-092-1214ND
2018-12-061225-092-1229ND
2018-12-101225-092-0954ND
2018-12-101225-092-0955ND
2018-12-101225-092-0959ND
2018-12-101225-092-1009ND
2018-12-101225-092-1024ND
2018-12-121225-092-1138ND
2018-12-121225-092-1139ND
2018-12-121225-092-1143ND
2018-12-121225-092-1153ND
2018-12-121225-092-1208ND
2019-01-151225-085-1545ND
2019-02-071225-016-1335ND
2019-02-071225-017-1300ND
2019-02-071225-044-1650ND
2019-02-071225-045-1710ND
2019-02-071225-046-1430ND
2019-02-071225-047-1515ND
2019-03-191225-029-1330ND
2019-03-191225-051-1230ND
2019-03-201225-024-1228ND
2019-03-211225-050-1415ND
2019-04-221225-072-1640ND
2019-04-221225-073-1600ND
2019-04-221225-087-1630ND
2019-04-241225-002-1430ND
2019-04-241225-006-1400ND
2019-04-241225-052-1330ND
2019-04-241225-074-1450ND
2019-05-061225-082-1350ND
2019-07-241225-048-1420ND
2019-07-301225-088-1300ND
2019-08-071225-026-1230ND
2019-08-081225-070-1530ND
2019-08-081225-088-1520ND
2019-08-121225-070-1230ND
2019-08-191225-070-1400ND
2019-08-221225-070-1852ND
2019-08-281225-070-1405ND
2019-09-061225-070-1320ND
2019-09-111225-070-1540ND
2019-09-181225-070-1620ND
2019-09-231225-070-1345ND
2019-09-251225-070-1600ND
2019-10-041225-070-1700ND
2019-10-111225-070-1620ND
2019-10-171225-070-1710ND
2019-10-221225-070-1300ND
2019-10-301225-088-1315ND
2019-10-311225-088-1342ND
2019-11-051225-070-1340ND
2019-11-051225-070-1410ND
2019-11-131225-070-1200ND
2019-11-191225-070-1400ND
2019-11-261225-070-1630ND
2019-12-021225-070-1245ND