Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Arsenic

Zone 7 Water Agency

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

 

235

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0595 ppb371ND - 2.20 ppb
2015ND290ND
2016ND310ND
2017ND310ND
2018ND510ND
20190.0375 ppb561ND - 2.10 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
2014-01-065100-001-0945ND
2014-01-065100-006-1120ND
2014-01-065100-008-0915ND
2014-01-065100-012-1240ND
2014-02-035100-001-1025ND
2014-02-185100-008-0950ND
2014-03-245100-001-1000ND
2014-03-245100-008-1045ND
2014-04-075100-001-0940ND
2014-04-075100-008-1120ND
2014-05-055100-001-0930ND
2014-05-055100-008-1035ND
2014-06-095100-001-1000ND
2014-06-095100-008-1035ND
2014-06-105100-005-1000ND
2014-06-105100-011-1040ND
2014-06-115100-006-0825ND
2014-06-115100-013-0930ND
2014-06-165100-007-0910ND
2014-06-175100-012-1125ND
2014-06-195100-019-0935ND
2014-07-075100-001-10002.20 ppb
2014-07-075100-008-1015ND
2014-08-045100-001-0950ND
2014-08-045100-008-1035ND
2014-08-115100-005-0920ND
2014-08-115100-011-0940ND
2014-09-085100-001-0840ND
2014-09-085100-006-1150ND
2014-09-095100-007-0930ND
2014-09-105100-005-0830ND
2014-09-105100-011-0800ND
2014-10-065100-001-1110ND
2014-10-065100-008-0825ND
2014-11-035100-001-0935ND
2014-11-035100-008-0930ND
2014-11-135100-017-0905ND
2015-01-055100-001-0935ND
2015-01-055100-008-0945ND
2015-02-025100-008-0955ND
2015-03-025100-001-1005ND
2015-03-035100-017-0825ND
2015-03-245100-019-1005ND
2015-04-135100-001-0850ND
2015-04-135100-008-0840ND
2015-05-045100-001-0945ND
2015-05-045100-008-1025ND
2015-06-225100-001-1100ND
2015-06-225100-008-0845ND
2015-06-245100-019-0845ND
2015-06-255100-017-0955ND
2015-06-265100-005-0905ND
2015-06-265100-007-0930ND
2015-07-065100-001-0855ND
2015-07-065100-008-1036ND
2015-08-035100-001-0920ND
2015-08-035100-008-1010ND
2015-09-085100-001-0930ND
2015-09-085100-008-1030ND
2015-09-105100-017-0910ND
2015-10-055100-001-0950ND
2015-10-055100-008-0920ND
2015-11-025100-001-0927ND
2015-11-025100-008-0925ND
2015-11-235100-017-1110ND
2015-12-075100-001-0930ND
2016-01-045100-001-0930ND
2016-02-015100-001-1405ND
2016-02-035100-012-1050ND
2016-02-095100-005-0855ND
2016-02-095100-011-0842ND
2016-03-035100-006-1100ND
2016-03-035100-017-0935ND
2016-03-075100-001-0925ND
2016-03-295100-007-1245ND
2016-03-305100-020-1030ND
2016-04-045100-005-1044ND
2016-04-045100-008-0905ND
2016-04-045100-013-1425ND
2016-04-045100-019-1135ND
2016-04-065100-012-1105ND
2016-04-065100-020-1155ND
2016-05-025100-019-1225ND
2016-05-045100-001-0825ND
2016-05-045100-008-1200ND
2016-05-195100-007-0900ND
2016-05-195100-017-0945ND
2016-05-195100-020-1058ND
2016-06-025100-005-0820ND
2016-06-065100-001-0935ND
2016-06-065100-008-1025ND
2016-07-115100-001-0920ND
2016-07-115100-007-1220ND
2016-07-115100-008-1010ND
2016-07-115100-020-1317ND
2016-07-135100-017-1035ND
2016-07-135100-019-0920ND
2017-01-049590-013-1000ND
2017-01-049590-017-0945ND
2017-01-239590-012-1030ND
2017-02-149590-008-1023ND
2017-02-149590-020-1455ND
2017-02-159590-001-1045ND
2017-07-105100-007-1010ND
2017-07-105100-019-1135ND
2017-07-115100-001-0935ND
2017-07-115100-008-0955ND
2017-07-115100-017-1210ND
2017-07-125100-012-0900ND
2017-07-135100-013-0915ND
2017-07-315100-020-1040ND
2017-08-095100-001-1015ND
2017-08-095100-008-1035ND
2017-09-055100-001-0900ND
2017-09-055100-008-0947ND
2017-09-255100-005-1010ND
2017-10-025100-001-0915ND
2017-10-025100-008-1010ND
2017-10-035100-005-1055ND
2017-10-035100-013-1025ND
2017-10-035100-017-0950ND
2017-10-055100-006-0935ND
2017-10-055100-007-1015ND
2017-10-165100-019-1255ND
2017-11-065100-001-0915ND
2017-11-065100-008-1050ND
2017-12-045100-001-0900ND
2017-12-045100-008-0945ND
2018-01-225100-001-0946ND
2018-01-255100-005-1335ND
2018-02-055100-012-0905ND
2018-02-055100-013-0850ND
2018-02-055100-017-0950ND
2018-02-065100-001-0958ND
2018-02-065100-005-0912ND
2018-02-065100-011-0855ND
2018-02-285100-006-0945ND
2018-02-285100-008-1100ND
2018-03-075100-001-1123ND
2018-03-075100-008-1010ND
2018-04-095100-001-1137ND
2018-04-095100-008-1020ND
2018-04-095100-017-1035ND
2018-04-105100-005-1240ND
2018-04-105100-011-1215ND
2018-04-105100-019-0925ND
2018-04-115100-006-1010ND
2018-04-115100-012-1040ND
2018-04-115100-013-0940ND
2018-05-075100-001-1515ND
2018-05-075100-008-1330ND
2018-06-045100-001-0920ND
2018-06-045100-008-1010ND
2018-07-095100-001-1225ND
2018-07-095100-005-1350ND
2018-07-095100-008-0925ND
2018-07-095100-013-0930ND
2018-07-095100-017-1120ND
2018-07-095100-019-1000ND
2018-07-115100-006-0935ND
2018-07-115100-011-0900ND
2018-08-065100-001-0935ND
2018-08-065100-008-0925ND
2018-08-075100-007-0845ND
2018-09-105100-001-0830ND
2018-09-105100-008-0840ND
2018-09-255100-020-1314ND
2018-10-085100-001-0825ND
2018-10-085100-008-0959ND
2018-10-085100-012-1200ND
2018-10-085100-019-1140ND
2018-10-095100-017-0900ND
2018-10-105100-007-1435ND
2018-10-105100-020-1415ND
2018-12-035100-008-1010ND
2018-12-035100-020-1005ND
2018-12-045100-013-0920ND
2018-12-045100-019-1000ND
2018-12-175100-001-0923ND
2019-01-075100-005-1215ND
2019-01-075100-008-1017ND
2019-01-075100-012-1100ND
2019-01-075100-017-1025ND
2019-01-075100-020-1150ND
2019-01-085100-007-0910ND
2019-01-085100-011-1015ND
2019-01-085100-019-0940ND
2019-02-045100-008-1028ND
2019-03-045100-008-0907ND
2019-04-085100-007-1130ND
2019-04-085100-008-0925ND
2019-04-085100-017-0916ND
2019-04-095100-006-0920ND
2019-04-095100-012-0935ND
2019-04-095100-013-0955ND
2019-04-095100-019-1040ND
2019-05-065100-001-0850ND
2019-05-065100-008-1215ND
2019-06-035100-001-0940ND
2019-06-035100-008-0910ND
2019-07-085100-005-1015ND
2019-07-085100-007-0950ND
2019-07-085100-011-0945ND
2019-07-085100-013-1015ND
2019-07-085100-020-1130ND
2019-07-095100-006-1145ND
2019-07-095100-017-0925ND
2019-07-095100-019-10452.10 ppb
2019-07-105100-001-1010ND
2019-07-105100-008-1115ND
2019-08-055100-001-1105ND
2019-08-055100-008-0915ND
2019-08-055100-012-0905ND
2019-08-055100-020-0935ND
2019-09-095100-001-0840ND
2019-09-095100-008-1005ND
2019-10-075100-001-1325ND
2019-10-075100-005-1150ND
2019-10-075100-006-0900ND
2019-10-075100-007-0830ND
2019-10-075100-008-1210ND
2019-10-075100-011-1050ND
2019-10-075100-012-1015ND
2019-10-075100-013-0945ND
2019-10-075100-020-0920ND
2019-10-085100-017-0830ND
2019-10-085100-019-1015ND
2019-11-045100-001-0855ND
2019-11-045100-008-1030ND
2019-12-025100-008-1006ND
2019-12-025100-020-0850ND
2019-12-035100-017-1155ND
2019-12-035100-019-1340ND
2019-12-105100-017-1100ND
2019-12-105100-019-0942ND