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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Lompoc Water Utility Division

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

 

88

Samples

0

Samples exceeding legal limit (MCL)

61

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.500 ppb142ND - 4.00 ppb
20153.07 ppb1410ND - 9.00 ppb
20162.80 ppb2015ND - 9.00 ppb
20173.23 ppb1310ND - 9.00 ppb
20182.43 ppb1412ND - 4.00 ppb
20192.46 ppb1312ND - 4.00 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
2014-01-075867-002-0836ND
2014-01-155867-012-11154.00 ppb
2014-01-155867-002-1316ND
2014-02-055867-002-0746ND
2014-03-055867-002-0748ND
2014-04-025867-002-1048ND
2014-05-075867-002-0820ND
2014-06-045867-002-0754ND
2014-07-025867-002-0915ND
2014-08-065867-002-0802ND
2014-09-035867-002-0804ND
2014-10-085867-002-07533.00 ppb
2014-11-055867-002-0818ND
2014-12-035867-002-0821ND
2015-01-065867-002-09155.00 ppb
2015-01-075867-012-11044.00 ppb
2015-01-145867-002-08024.00 ppb
2015-02-045867-002-0955ND
2015-03-045867-002-0804ND
2015-04-015867-002-08543.00 ppb
2015-05-065867-002-09104.00 ppb
2015-06-035867-002-09249.00 ppb
2015-07-015867-002-1138ND
2015-08-055867-002-08523.00 ppb
2015-09-025867-002-08005.00 ppb
2015-10-075867-002-09353.00 ppb
2015-11-045867-002-09263.00 ppb
2015-12-025867-002-0924ND
2016-01-015867-002-10179.00 ppb
2016-01-065867-002-1017ND
2016-01-205867-012-12244.00 ppb
2016-02-035867-002-1056ND
2016-03-025867-002-10332.00 ppb
2016-04-065867-002-09143.00 ppb
2016-05-045867-002-09582.00 ppb
2016-06-015867-002-1002ND
2016-07-065867-002-10053.00 ppb
2016-08-035867-002-09254.00 ppb
2016-08-175867-002-11302.00 ppb
2016-08-245867-002-09583.00 ppb
2016-09-025867-002-0957ND
2016-09-075867-002-0954ND
2016-09-145867-002-10113.00 ppb
2016-09-215867-002-09236.00 ppb
2016-09-285867-002-11504.00 ppb
2016-10-055867-002-10104.00 ppb
2016-11-025867-002-10354.00 ppb
2016-12-075867-002-11233.00 ppb
2017-01-045867-012-12054.00 ppb
2017-01-045867-002-1238ND
2017-02-015867-002-1017ND
2017-03-015867-002-1017ND
2017-04-055867-002-09073.00 ppb
2017-05-035867-002-10513.00 ppb
2017-06-075867-002-09413.00 ppb
2017-07-055867-002-10213.00 ppb
2017-08-025867-002-10225.00 ppb
2017-09-135867-002-08379.00 ppb
2017-10-045867-002-09184.00 ppb
2017-11-015867-002-10115.00 ppb
2017-12-065867-002-11063.00 ppb
2018-01-035867-002-11123.00 ppb
2018-01-035867-012-10274.00 ppb
2018-02-075867-002-08423.00 ppb
2018-03-075867-002-11022.00 ppb
2018-03-075867-002-11052.00 ppb
2018-04-045867-002-09183.00 ppb
2018-05-025867-002-1112ND
2018-06-065867-002-09582.00 ppb
2018-07-115867-002-11523.00 ppb
2018-08-015867-002-10212.00 ppb
2018-09-055867-002-09203.00 ppb
2018-10-035867-002-11064.00 ppb
2018-11-075867-002-1012ND
2018-12-125867-002-08463.00 ppb
2019-01-025867-002-0820ND
2019-01-165867-012-10154.00 ppb
2019-02-055867-002-16022.00 ppb
2019-03-065867-002-10252.00 ppb
2019-04-035867-002-07502.00 ppb
2019-05-015867-002-10582.00 ppb
2019-06-055867-002-07463.00 ppb
2019-07-025867-002-07533.00 ppb
2019-08-075867-002-08024.00 ppb
2019-09-045867-002-07464.00 ppb
2019-10-025867-002-07542.00 ppb
2019-11-065867-002-07522.00 ppb
2019-12-045867-002-08052.00 ppb