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EWG's Tap Water Database — 2021 UPDATE

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Mercury (inorganic)

City of Mesa

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

 

81

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
2015ND320ND
2016ND20ND
2017ND10ND
2018ND300ND
2019ND150ND

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
2014-10-0820140090468IND
2015-04-07201504080340IND
2015-04-07201504080338IND
2015-04-07201504070448IND
2015-04-0715040249ND
2015-04-14201504150237IND
2015-04-21201504220401IND
2015-04-28201504290427IND
2015-04-29201504290428IND
2015-04-29201504290425IND
2015-07-06550-48278-1ND
2015-07-06550-48277-1ND
2015-07-06550-48276-1ND
2015-07-06550-48275-1ND
2015-07-07550-48274-1ND
2015-07-07550-48273-1ND
2015-07-07550-48272-1ND
2015-07-13201507280206IND
2015-07-13201507280205IND
2015-07-13201507280207IND
2015-07-13201507280208IND
2015-07-14201507280212IND
2015-07-14201507280211IND
2015-07-14201507280210IND
2015-07-14201507280209IND
2015-07-20201507280213IND
2015-07-21201507280216IND
2015-07-2115070448ND
2015-07-21201507280214IND
2015-07-21201507280215IND
2015-07-21201507280217IND
2015-07-21201507280218IND
2015-07-27201507280231IND
2016-06-08201606090223IND
2016-10-0416100039ND
2017-10-1017100401ND
2018-04-0218030942ND
2018-04-0418030948 IOCND
2018-04-0918040098ND
2018-04-0918040100 IOCND
2018-04-1018040101ND
2018-04-1618040222 IOCND
2018-04-1618040220 IOCND
2018-04-1718040224ND
2018-04-1718040223 IOCND
2018-04-2418040504 IOCND
2018-04-2418040503 IOCND
2018-04-2418040502 IOCND
2018-04-3018040540 IOCND
2018-05-1018050425ND
2018-08-0718080202 IOCND
2018-10-1118100452ND
2018-10-1518100506ND
2018-10-1518100484ND
2018-10-1618100519ND
2018-10-1618100517ND
2018-10-1718100557ND
2018-10-1718100555 IOCND
2018-10-1818100597ND
2018-10-2218100638ND
2018-10-2218100640ND
2018-10-2318100673ND
2018-10-2418100683ND
2018-10-2418100681ND
2018-10-2918100752ND
2018-11-2618110662 IOCND
2019-03-2719030655ND
2019-03-2819030580ND
2019-04-0819040180ND
2019-04-0819040182ND
2019-04-1019040260ND
2019-04-1119040287ND
2019-04-1519040331ND
2019-04-1619040354ND
2019-04-1619040352ND
2019-04-2419040522ND
2019-08-0519080019ND
2019-08-0819080129ND
2019-08-1519080280ND
2019-08-2619080657ND
2019-09-1919090600ND