Know Your Environment. Protect Your Health.

Mercury (inorganic)

The Oaks Water Supply Corporation

NOTE: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for mercury (inorganic). Sample information shown below was taken by San Antonio Water System.

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.

 

85

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND10ND
2020ND90ND
2021ND30ND
2022ND10ND
2023ND70ND

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

NOTE: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for mercury (inorganic). Sample information shown below was taken by San Antonio Water System.

Date Lab ID Result
2018-03-01AE16254ND
2019-01-30AE52135ND
2019-01-31AE52377ND
2019-01-31AE52378ND
2019-03-07AE57535ND
2019-03-07AE57534ND
2019-03-28AE60415ND
2019-03-28AE60416ND
2019-04-23AE63297ND
2019-04-23AE63298ND
2019-04-25AE63669ND
2019-04-25AE63670ND
2019-05-21AE67304ND
2019-05-21AE67305ND
2019-05-21AE67306ND
2019-05-21AE67307ND
2019-08-13AE78239ND
2019-11-13AE89065ND
2019-11-14AE89236ND
2019-11-14AE89235ND
2019-11-14AE89232ND
2019-11-14AE89229ND
2019-11-25AE90344ND
2019-11-25AE90342ND
2019-11-25AE90341ND
2019-11-25AE90340ND
2019-11-25AE90343ND
2019-11-26AE90541ND
2019-11-26AE90540ND
2019-12-10AE91813ND
2019-12-10AE91812ND
2019-12-10AE91811ND
2019-12-11AE92086ND
2019-12-11AE92082ND
2020-03-31AF05028ND
2020-06-15AF15309ND
2020-10-07AF29758ND
2020-10-07AF29759ND
2020-11-11AF33960ND
2020-11-16AF34533ND
2020-11-17AF34839ND
2020-11-18AF35059ND
2020-12-15AF37633ND
2021-03-03AF45022ND
2021-03-03AF45019ND
2021-05-11AF53150ND
2021-06-14AF57681ND
2021-09-28AF71383ND
2022-01-13AF80119ND
2022-04-13AF93064ND
2022-04-14AF93284ND
2022-06-27AG02308ND
2022-06-27AG02311ND
2022-06-27AG02310ND
2022-06-27AG02309ND
2022-06-27AG02307ND
2022-08-04AG07773ND
2022-10-24AG17985ND
2022-10-24AG17983ND
2022-10-24AG17981ND
2022-10-24AG17982ND
2022-10-25AG18246ND
2022-10-25AG18251ND
2022-10-25AG18247ND
2022-12-05AG20600ND
2022-12-05AG20599ND
2022-12-05AG20598ND
2022-12-05AG20597ND
2022-12-05AG20594ND
2022-12-05AG20593ND
2022-12-07AG21071ND
2022-12-07AG21078ND
2022-12-07AG21077ND
2022-12-07AG21076ND
2022-12-07AG21075ND
2022-12-07AG21074ND
2022-12-07AG21073ND
2022-12-07AG21072ND
2023-05-08AG39495ND
2023-07-11AG47768ND
2023-10-31AG61749ND
2023-11-15AG63696ND
2023-11-15AG63697ND
2023-11-15AG63698ND
2023-12-18AG66788ND