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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Farm Mutual Water Company (the)

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

MORE ABOUT THIS CONTAMINANT

 

44

Samples

3

Samples exceeding legal limit (MCL)

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20147.67 ppb773.50 ppb - 12.0 ppb
20155.52 ppb54ND - 9.90 ppb
20162.53 ppb94ND - 7.90 ppb
20172.29 ppb114ND - 9.80 ppb
20180.825 ppb41ND - 3.30 ppb
20190.400 ppb81ND - 3.20 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic 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 cancer.

EPA Maximum Contaminant
Level (MCL) 10 ppb

The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-044790-003-09253.70 ppb
2014-03-044790-002-091511.0 ppb
2014-06-034790-003-09203.50 ppb
2014-06-034790-002-091011.0 ppb
2014-09-034790-003-10154.10 ppb
2014-12-024790-003-09558.40 ppb
2014-12-024790-002-094012.0 ppb
2015-03-034790-003-0920ND
2015-06-024790-003-09357.30 ppb
2015-07-204790-003-08534.90 ppb
2015-09-024790-003-07269.90 ppb
2015-12-014790-003-09095.50 ppb
2016-03-014790-003-09506.90 ppb
2016-03-284790-001-0900ND
2016-06-074790-001-1031ND
2016-06-074790-003-09454.60 ppb
2016-09-064790-001-0840ND
2016-09-064790-003-09453.40 ppb
2016-09-204790-001-0720ND
2016-12-064790-001-0812ND
2016-12-064790-003-07587.90 ppb
2017-01-184790-001-0703ND
2017-03-074790-001-0920ND
2017-03-074790-003-10206.00 ppb
2017-06-064790-001-0911ND
2017-06-064790-003-09204.80 ppb
2017-08-024790-003-0053ND
2017-08-024790-002-10379.80 ppb
2017-09-054790-003-0845ND
2017-09-054790-001-0725ND
2017-12-054790-003-09114.60 ppb
2017-12-054790-001-0814ND
2018-02-204790-003-0755ND
2018-02-204790-001-0740ND
2018-05-154790-003-10013.30 ppb
2018-05-154790-001-1001ND
2019-03-054790-003-07553.20 ppb
2019-03-054790-001-0821ND
2019-06-064790-001-0915ND
2019-06-064790-003-0940ND
2019-09-034790-001-0800ND
2019-09-034790-003-0815ND
2019-12-034790-003-0936ND
2019-12-034790-001-0855ND