Know Your Environment. Protect Your Health.

Mercury (inorganic)

Town of Hampstead

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.

 

33

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND110ND
2019N/A00N/A
2020ND80ND
20210.0500 ppb81ND - 0.400 ppb
2022ND20ND
2023ND40ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-06-04E054175_12ND
2018-09-05E055512_04ND
2018-09-05E055512_20ND
2018-09-05E055512_18ND
2018-09-05E055512_15ND
2018-09-05E055512_10ND
2018-09-05E055512_08ND
2018-09-05E055512_06ND
2018-10-02E19001148003ND
2018-10-02E1900148002ND
2018-12-03E056641_02ND
2020-03-03E062383-06ND
2020-03-03E062383-18ND
2020-03-03E20002994004ND
2020-06-03E20003718002ND
2020-07-29E21000292002ND
2020-09-01E064325-04ND
2020-09-01E064325-11ND
2020-12-14E065517_02ND
2021-01-21E21001852002ND
2021-06-02E067105_14ND
2021-09-01E068099_05ND
2021-09-01E068099_060.400 ppb
2021-09-01E068099_12ND
2021-09-01E068099_15ND
2021-09-01E068099_16ND
2021-12-02E069059_02ND
2022-03-01E2200123702ND
2022-08-03E230002502ND
2023-03-01030123-316BB1-3ND
2023-09-05090523-316T-T1ND
2023-09-05090523-316Z-Z1ND
2023-12-04120423-316AA1-BB3ND