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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Lakeview Improvement Assoication #1

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

 

84

Samples

31

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201422.3 ppb3318.0 ppb - 30.0 ppb
201527.0 ppb8816.0 ppb - 36.0 ppb
201624.8 ppb8813.0 ppb - 42.0 ppb
201723.0 ppb8813.0 ppb - 33.0 ppb
20181.56 ppb578ND - 39.0 ppb
2019N/A00N/A

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
2014-06-015806-002-090030.0 ppb
2014-06-015806-001-090018.0 ppb
2014-07-135806-001-090019.0 ppb
2015-01-185806-001-090025.0 ppb
2015-01-185806-002-090035.0 ppb
2015-04-125806-001-090027.0 ppb
2015-04-125806-002-090032.0 ppb
2015-07-125806-001-090025.0 ppb
2015-07-125806-002-090016.0 ppb
2015-10-065806-001-110020.0 ppb
2015-10-065806-002-110036.0 ppb
2016-03-275806-001-090041.0 ppb
2016-03-275806-002-090013.0 ppb
2016-06-125806-001-130024.0 ppb
2016-06-125806-002-131013.0 ppb
2016-08-075806-001-090014.0 ppb
2016-08-075806-002-090035.0 ppb
2016-10-305806-001-120016.0 ppb
2016-10-305806-002-120042.0 ppb
2017-04-305806-001-120024.0 ppb
2017-04-305806-002-120033.0 ppb
2017-06-045806-002-100023.0 ppb
2017-06-045806-001-100016.0 ppb
2017-09-115806-001-120013.0 ppb
2017-09-305806-002-120019.0 ppb
2017-11-265806-002-123027.0 ppb
2017-11-265806-001-120029.0 ppb
2018-01-145806-174-1015ND
2018-01-145806-145-1000ND
2018-01-145806-173-0900ND
2018-01-145806-165-1115ND
2018-01-145806-164-1100ND
2018-01-145806-161-1030ND
2018-02-045806-138-1130ND
2018-02-045806-110-1230ND
2018-02-045806-148-1100ND
2018-02-045806-155-120016.0 ppb
2018-02-195806-132-1040ND
2018-02-195806-159-1015ND
2018-02-195806-114-1130ND
2018-02-195806-106-1000ND
2018-02-195806-177-1110ND
2018-02-255806-155-1000ND
2018-04-155806-001-104512.0 ppb
2018-04-155806-002-103011.0 ppb
2018-04-235806-120-1330ND
2018-04-235806-101-0900ND
2018-04-235806-118-1300ND
2018-04-235806-146-0930ND
2018-04-235806-143-1030ND
2018-05-035806-137-1030ND
2018-05-035806-126-1000ND
2018-05-135806-137-1030ND
2018-05-135806-126-1000ND
2018-05-285806-177-1300ND
2018-05-285806-116-1115ND
2018-05-285806-117-1020ND
2018-05-285806-151-1230ND
2018-05-285806-134-10002.60 ppb
2018-05-285806-156-1045ND
2018-07-085806-160-1130ND
2018-07-085806-127-1030ND
2018-07-085806-178-1145ND
2018-07-085806-115-1000ND
2018-07-085806-135-1100ND
2018-07-085806-152-1115ND
2018-07-085806-125-1015ND
2018-07-085806-133-1045ND
2018-07-285806-162-0930ND
2018-07-285806-163-1000ND
2018-07-285806-123-1100ND
2018-07-285806-124-1030ND
2018-07-285806-176-0900ND
2018-07-295806-127-1000ND
2018-07-295806-121-1100ND
2018-07-295806-113-1130ND
2018-07-295806-102-1015ND
2018-08-225806-172-1100ND
2018-08-225806-104-09002.20 ppb
2018-08-225806-166-0830ND
2018-08-225806-149-10003.10 ppb
2018-08-225806-130-09303.20 ppb
2018-08-225806-153-1030ND
2018-09-065806-002-120039.0 ppb