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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Fcwwd #41/shaver Lake

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

 

127

Samples

4

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.85 ppb1310ND - 17.0 ppb
20151.28 ppb245ND - 8.90 ppb
20160.987 ppb153ND - 5.90 ppb
20174.85 ppb43ND - 6.60 ppb
20180.673 ppb404ND - 9.90 ppb
20191.02 ppb316ND - 7.60 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
2014-01-275802-044-105011.0 ppb
2014-04-185802-044-104012.0 ppb
2014-06-035802-070-0900ND
2014-07-015802-070-0830ND
2014-07-225802-044-114017.0 ppb
2014-08-055802-070-10151.60 ppb
2014-08-072371-047-11100.816 ppb
2014-08-072371-048-12550.522 ppb
2014-08-072371-049-12050.553 ppb
2014-09-095802-070-09001.20 ppb
2014-10-075802-070-0800ND
2014-10-285802-044-104517.0 ppb
2014-12-045802-070-08201.40 ppb
2015-01-065802-070-0900ND
2015-02-045802-070-0830ND
2015-03-035802-070-0820ND
2015-03-175802-044-13306.50 ppb
2015-04-015802-044-12008.90 ppb
2015-06-025802-044-12304.00 ppb
2015-06-045802-001-0800ND
2015-06-045802-004-0900ND
2015-06-045802-005-0930ND
2015-06-175802-033-0850ND
2015-06-175802-034-1030ND
2015-06-175802-062-0930ND
2015-06-185802-009-1030ND
2015-06-245802-011-1000ND
2015-06-245802-012-0930ND
2015-06-255802-008-0400ND
2015-06-255802-014-0945ND
2015-06-255802-015-1030ND
2015-06-305802-006-0830ND
2015-06-305802-035-0930ND
2015-07-015802-036-0830ND
2015-07-015802-042-0930ND
2015-07-085802-044-12304.90 ppb
2015-10-065802-044-10306.50 ppb
2016-01-275802-044-10004.80 ppb
2016-04-055802-044-10304.10 ppb
2016-06-165802-056-1130ND
2016-06-165802-057-1030ND
2016-06-165802-058-0930ND
2016-08-175802-059-0930ND
2016-08-175802-065-1015ND
2016-08-175802-066-0845ND
2016-08-245802-044-10305.90 ppb
2016-08-245802-046-0930ND
2016-09-275802-038-1015ND
2016-09-275802-041-1115ND
2016-10-125802-040-1030ND
2016-11-155802-043-1000ND
2016-12-155802-037-0830ND
2017-05-025802-002-1100ND
2017-06-275802-044-09156.40 ppb
2017-07-125802-044-10306.40 ppb
2017-08-105802-044-11246.60 ppb
2018-03-125802-001-1055ND
2018-03-125802-005-1119ND
2018-03-125802-008-1200ND
2018-03-125802-014-1310ND
2018-03-125802-015-1341ND
2018-03-125802-033-1239ND
2018-03-145802-004-1053ND
2018-03-145802-034-0320ND
2018-03-145802-062-1234ND
2018-03-165802-006-1041ND
2018-03-165802-011-1212ND
2018-03-165802-012-1225ND
2018-03-165802-035-1334ND
2018-03-165802-036-1304ND
2018-03-195802-009-1332ND
2018-03-195802-042-1207ND
2018-03-195802-044-12515.70 ppb
2018-04-045802-044-11295.40 ppb
2018-04-095802-001-1058ND
2018-04-095802-004-1113ND
2018-04-095802-005-1117ND
2018-04-095802-033-1159ND
2018-04-115802-006-1318ND
2018-04-115802-008-1212ND
2018-04-135802-014-1404ND
2018-04-135802-015-1040ND
2018-04-135802-034-1345ND
2018-04-135802-062-1313ND
2018-04-185802-011-1135ND
2018-04-185802-012-1148ND
2018-04-185802-035-1037ND
2018-04-185802-036-1054ND
2018-04-205802-009-1329ND
2018-04-205802-042-1155ND
2018-06-185802-044-07525.90 ppb
2018-07-115802-070-1135ND
2018-07-115802-071-1052ND
2018-09-125802-044-10009.90 ppb
2018-11-065802-070-1225ND
2018-11-065802-071-1030ND
2019-01-095802-070-1140ND
2019-01-095802-071-1225ND
2019-01-155802-037-11396.80 ppb
2019-02-135802-070-1017ND
2019-02-135802-071-1145ND
2019-03-275802-044-10203.60 ppb
2019-04-035802-070-0915ND
2019-04-035802-071-0800ND
2019-05-085802-070-1045ND
2019-05-085802-071-1010ND
2019-06-115802-070-1110ND
2019-06-115802-071-1035ND
2019-06-195802-037-1030ND
2019-06-195802-040-1115ND
2019-06-195802-041-1120ND
2019-06-195802-043-1310ND
2019-06-195802-044-13207.60 ppb
2019-06-195802-046-1000ND
2019-06-195802-056-0926ND
2019-06-195802-057-0910ND
2019-06-195802-058-0855ND
2019-06-195802-059-0955ND
2019-06-195802-065-0940ND
2019-06-195802-066-0957ND
2019-06-265802-066-1230ND
2019-07-025802-070-1015ND
2019-07-025802-071-0920ND
2019-07-235802-044-11305.20 ppb
2019-10-145802-044-12154.10 ppb
2019-11-055802-044-12264.20 ppb
2019-12-185802-038-0933ND