Know Your Environment. Protect Your Health.

Mercury (inorganic)

Annapolis PWS

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND80ND
2020ND80ND
2021ND80ND
2022ND80ND
2023ND80ND

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
2018-01-29AD11500ND
2018-01-29AD11499ND
2018-05-02AD18215ND
2018-05-02AD18214ND
2018-07-10AD29393ND
2018-07-10AD29394ND
2018-10-17AD34548ND
2018-10-17AD34549ND
2019-01-10AD37860ND
2019-01-10AD37861ND
2019-04-15AD46284ND
2019-04-15AD46285ND
2019-07-23AD52085ND
2019-07-23AD52084ND
2019-10-22AD56862ND
2019-10-22AD56863ND
2020-02-03AD60672ND
2020-02-03AD60671ND
2020-06-032010513ND
2020-06-032010512ND
2020-07-272011669ND
2020-07-272011670ND
2020-10-292016617ND
2020-10-292016616ND
2021-01-212020217ND
2021-01-212020216ND
2021-04-192103830ND
2021-04-192103829ND
2021-07-192113682ND
2021-07-192113683ND
2021-10-262118145ND
2021-10-262118144ND
2022-01-242122169ND
2022-01-242122168ND
2022-04-132204381ND
2022-04-132204382ND
2022-07-122214771ND
2022-07-122214772ND
2022-10-242219680ND
2022-10-242219681ND
2023-02-142301319ND
2023-02-142301320ND
2023-04-192303489ND
2023-04-192303488ND
2023-07-192311680ND
2023-07-192311679ND
2023-10-162316861ND
2023-10-162316860ND