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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Los Angeles, City Of - Power Plant #2

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

 

72

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.467 ppb122ND - 3.40 ppb
2015ND120ND
2016ND120ND
2017ND120ND
2018ND120ND
20191.14 ppb124ND - 4.20 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
2014-01-081200-002-0350ND
2014-02-051200-002-1220ND
2014-03-051200-002-1020ND
2014-04-091200-002-1020ND
2014-05-131200-002-1225ND
2014-06-121200-002-11502.20 ppb
2014-07-091200-002-09403.40 ppb
2014-07-171200-002-0845ND
2014-09-111200-002-1130ND
2014-10-091200-002-0850ND
2014-11-101200-002-1210ND
2014-12-101200-002-1230ND
2015-01-081200-002-1015ND
2015-02-051200-002-1120ND
2015-03-051200-002-0910ND
2015-04-071200-002-0930ND
2015-05-051200-002-1115ND
2015-06-101200-002-0910ND
2015-07-081200-002-0930ND
2015-08-181200-002-0920ND
2015-09-021200-002-1130ND
2015-10-071200-002-1000ND
2015-11-051200-002-0915ND
2015-12-091200-002-1105ND
2016-01-081200-002-1000ND
2016-02-031200-002-1045ND
2016-03-101200-002-0945ND
2016-04-071200-002-0935ND
2016-05-051200-002-1015ND
2016-06-101200-002-1140ND
2016-07-071200-002-0940ND
2016-08-041200-002-0850ND
2016-09-091200-002-1305ND
2016-10-061200-002-1130ND
2016-11-081200-002-1045ND
2016-12-121200-002-1135ND
2017-01-231200-002-1030ND
2017-02-271200-002-1200ND
2017-03-201200-002-1025ND
2017-04-171200-002-1117ND
2017-05-221200-002-1233ND
2017-06-121200-002-1148ND
2017-07-151200-002-0835ND
2017-08-151200-002-1105ND
2017-09-091200-002-1013ND
2017-10-071200-002-1118ND
2017-11-221200-002-1042ND
2017-12-201200-002-0900ND
2018-01-221200-002-0912ND
2018-02-201200-002-0927ND
2018-03-191200-002-1011ND
2018-04-231200-002-0915ND
2018-05-211200-002-0955ND
2018-06-181200-002-0839ND
2018-07-231200-002-0931ND
2018-08-211200-002-1020ND
2018-09-241200-002-1128ND
2018-10-221200-002-0830ND
2018-11-191200-002-0944ND
2018-12-171200-002-1003ND
2019-01-221200-002-0934ND
2019-02-061200-002-1106ND
2019-03-041200-002-1115ND
2019-04-011200-002-1150ND
2019-05-061200-002-1033ND
2019-06-031200-002-1106ND
2019-07-011200-002-1012ND
2019-08-051200-002-1138ND
2019-09-091200-002-10423.40 ppb
2019-10-071200-002-11104.20 ppb
2019-11-041200-002-12004.10 ppb
2019-12-021200-002-11002.00 ppb