Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Arsenic

Cal-am Water Company - Duarte

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.

 

57

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.795 ppb227ND - 3.10 ppb
20140.375 ppb81ND - 3.00 ppb
20150.429 ppb71ND - 3.00 ppb
20160.830 ppb207ND - 3.10 ppb
2017N/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
2013-09-129590-007-1330ND
2013-09-129590-003-13402.50 ppb
2013-09-129590-008-1425ND
2013-09-129590-010-14502.00 ppb
2013-09-129590-002-1440ND
2013-09-129590-004-14152.20 ppb
2013-09-129590-009-13553.10 ppb
2013-09-181225-009-10253.00 ppb
2013-09-181225-007-0950ND
2013-09-181225-008-1105ND
2013-09-181225-004-1045ND
2013-09-181225-010-1150ND
2013-09-181225-003-1010ND
2013-09-181225-002-1130ND
2013-09-181225-019-0850ND
2013-12-049588-008-1140ND
2013-12-049588-004-1130ND
2013-12-049588-003-1055ND
2013-12-049588-007-1040ND
2013-12-049588-009-11052.60 ppb
2013-12-049588-010-12202.10 ppb
2013-12-049588-002-1210ND
2014-06-231225-007-1240ND
2014-06-231225-002-1300ND
2014-06-231225-003-1110ND
2014-06-231225-008-1235ND
2014-06-231225-009-11353.00 ppb
2014-06-231225-010-1330ND
2014-06-231225-019-1005ND
2014-12-039588-019-1020ND
2015-09-281225-003-1050ND
2015-09-281225-007-1200ND
2015-09-281225-008-1330ND
2015-09-281225-010-0945ND
2015-09-281225-009-13453.00 ppb
2015-10-141225-002-1205ND
2015-10-141225-019-0945ND
2016-06-201225-008-1145ND
2016-06-201225-019-1115ND
2016-06-201225-010-1135ND
2016-07-201225-007-0930ND
2016-07-201225-002-1110ND
2016-07-201225-003-10002.00 ppb
2016-07-201225-009-10303.00 ppb
2016-08-109590-019-1125ND
2016-08-109590-008-1030ND
2016-08-109590-007-1045ND
2016-08-109590-010-10152.00 ppb
2016-08-119590-009-11503.10 ppb
2016-08-119590-003-12052.00 ppb
2016-08-119590-002-1105ND
2016-09-079588-007-1245ND
2016-09-079588-003-1305ND
2016-09-079588-008-1345ND
2016-09-079588-010-13152.00 ppb
2016-09-079588-002-1330ND
2016-09-079588-009-14002.50 ppb