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EWG's Tap Water Database — 2019 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.

 

70

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.310 ppb101ND - 3.10 ppb
2013ND120ND
20140.467 ppb122ND - 3.40 ppb
2015ND120ND
2016ND120ND
2017ND120ND

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
2012-01-251200-002-1020ND
2012-02-161200-002-0930ND
2012-03-211200-002-1150ND
2012-05-221200-002-0925ND
2012-06-201200-002-1235ND
2012-07-181200-002-11053.10 ppb
2012-08-151200-002-1030ND
2012-09-121200-002-1210ND
2012-10-231200-002-1050ND
2012-11-131200-002-1255ND
2013-01-091200-002-1010ND
2013-02-261200-002-1235ND
2013-03-201200-002-1115ND
2013-04-161200-002-1010ND
2013-05-151200-002-1350ND
2013-06-191200-002-0945ND
2013-07-161200-002-1310ND
2013-08-141200-002-1125ND
2013-09-181200-002-1230ND
2013-10-161200-002-1125ND
2013-11-051200-002-1225ND
2013-12-051200-002-1015ND
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