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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

USMC - 29 Palms

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

 

368

Samples

0

Samples exceeding legal limit (MCL)

289

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.24 ppb5547ND - 8.00 ppb
20152.82 ppb6246ND - 7.90 ppb
20162.66 ppb5245ND - 7.20 ppb
20173.12 ppb6957ND - 8.30 ppb
20182.68 ppb6451ND - 8.60 ppb
20192.20 ppb6643ND - 8.60 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
2014-01-284790-014-10254.00 ppb
2014-02-044790-012-11205.00 ppb
2014-02-114790-014-10003.30 ppb
2014-02-124790-001-12353.90 ppb
2014-02-124790-003-13058.00 ppb
2014-02-124790-004-13206.30 ppb
2014-02-124790-005-1215ND
2014-02-124790-010-11452.80 ppb
2014-02-124790-011-12002.30 ppb
2014-02-124790-013-12503.80 ppb
2014-02-184790-012-12302.70 ppb
2014-02-254790-014-10406.50 ppb
2014-03-044790-012-1030ND
2014-03-114790-014-11002.90 ppb
2014-03-174790-012-11504.20 ppb
2014-03-254790-014-1015ND
2014-04-014790-012-12302.70 ppb
2014-04-084790-014-10302.90 ppb
2014-04-154790-012-10153.10 ppb
2014-04-224790-014-10403.00 ppb
2014-04-294790-012-09354.20 ppb
2014-05-064790-012-12302.20 ppb
2014-05-134790-014-11053.50 ppb
2014-05-144790-004-10303.60 ppb
2014-05-204790-012-10203.30 ppb
2014-05-274790-014-10254.10 ppb
2014-06-034790-012-11353.30 ppb
2014-06-104790-014-10203.90 ppb
2014-06-174790-012-11204.80 ppb
2014-06-244790-014-10302.90 ppb
2014-07-014790-012-11354.60 ppb
2014-07-084790-014-10305.30 ppb
2014-07-154790-012-11502.50 ppb
2014-07-224790-014-10005.10 ppb
2014-07-294790-012-12104.00 ppb
2014-08-054790-012-10456.30 ppb
2014-08-124790-014-1125ND
2014-08-194790-012-15452.90 ppb
2014-08-264790-012-1040ND
2014-09-024790-012-12153.60 ppb
2014-09-094790-014-1230ND
2014-09-104790-004-11006.10 ppb
2014-09-184790-012-00002.60 ppb
2014-09-234790-014-1025ND
2014-09-304790-012-11152.50 ppb
2014-10-074790-012-11304.40 ppb
2014-10-144790-014-11202.50 ppb
2014-10-214790-012-11152.80 ppb
2014-10-224790-004-10504.50 ppb
2014-11-254790-014-1130ND
2014-12-024790-012-09403.30 ppb
2014-12-094790-014-10003.60 ppb
2014-12-164790-012-11002.80 ppb
2014-12-234790-014-10152.40 ppb
2014-12-304790-012-11253.00 ppb
2015-01-064790-012-1235ND
2015-01-134790-014-0945ND
2015-01-204790-012-12303.10 ppb
2015-01-264790-001-11002.90 ppb
2015-01-264790-004-13305.70 ppb
2015-01-264790-005-1200ND
2015-01-264790-010-12452.90 ppb
2015-01-264790-011-14503.00 ppb
2015-01-264790-013-11404.10 ppb
2015-01-274790-014-1155ND
2015-02-034790-012-1150ND
2015-02-104790-014-12203.20 ppb
2015-02-174790-012-12152.80 ppb
2015-02-244790-014-10253.00 ppb
2015-03-024790-003-11007.00 ppb
2015-03-034790-012-0805ND
2015-03-104790-014-11452.70 ppb
2015-03-174790-012-0940ND
2015-03-174790-014-0943ND
2015-03-244790-014-1020ND
2015-03-314790-012-1120ND
2015-04-074790-012-11152.10 ppb
2015-04-144790-014-1225ND
2015-04-214790-012-1155ND
2015-04-224790-004-10106.10 ppb
2015-04-284790-014-12205.30 ppb
2015-05-054790-012-12053.40 ppb
2015-05-124790-014-1055ND
2015-05-194790-012-11153.10 ppb
2015-05-264790-014-0950ND
2015-06-024790-012-11503.00 ppb
2015-06-094790-014-11252.60 ppb
2015-06-164790-012-11053.30 ppb
2015-06-234790-014-10154.20 ppb
2015-06-304790-012-10405.90 ppb
2015-07-074790-012-10204.30 ppb
2015-07-144790-014-10155.30 ppb
2015-07-224790-012-10005.20 ppb
2015-07-284790-014-10156.10 ppb
2015-07-294790-004-11517.90 ppb
2015-08-044790-012-10353.40 ppb
2015-08-114790-014-10203.50 ppb
2015-08-184790-012-11053.30 ppb
2015-08-254790-014-10152.40 ppb
2015-09-014790-012-10203.60 ppb
2015-09-084790-014-10553.00 ppb
2015-09-154790-012-11502.70 ppb
2015-09-224790-014-10303.30 ppb
2015-09-294790-012-10102.40 ppb
2015-10-064790-012-10404.00 ppb
2015-10-134790-014-10402.40 ppb
2015-10-204790-012-1210ND
2015-10-214790-004-11556.80 ppb
2015-10-274790-014-10153.30 ppb
2015-11-034790-012-11504.20 ppb
2015-11-104790-014-1050ND
2015-11-174790-012-11402.90 ppb
2015-11-244790-014-10152.60 ppb
2015-12-014790-012-10502.90 ppb
2015-12-084790-014-11102.80 ppb
2015-12-224790-012-10303.70 ppb
2015-12-294790-014-10003.20 ppb
2016-01-054790-012-1130ND
2016-01-124790-014-10502.60 ppb
2016-01-194790-012-11252.80 ppb
2016-01-264790-014-10402.90 ppb
2016-02-024790-012-11102.60 ppb
2016-02-094790-014-11203.10 ppb
2016-03-014790-014-10502.90 ppb
2016-03-084790-014-14302.10 ppb
2016-03-154790-012-11002.00 ppb
2016-03-224790-014-1120ND
2016-03-294790-014-1130ND
2016-04-054790-012-10302.10 ppb
2016-04-124790-014-1210ND
2016-04-194790-012-11003.10 ppb
2016-04-264790-014-12203.50 ppb
2016-05-034790-012-1145ND
2016-05-104790-014-11452.10 ppb
2016-05-114790-006-1050ND
2016-05-114790-007-11304.20 ppb
2016-05-114790-008-11102.10 ppb
2016-05-174790-012-12002.80 ppb
2016-05-244790-014-12003.40 ppb
2016-05-314790-012-11003.20 ppb
2016-06-074790-012-12003.00 ppb
2016-06-144790-014-11452.70 ppb
2016-06-214790-012-11152.70 ppb
2016-06-284790-014-10403.40 ppb
2016-07-054790-012-10304.00 ppb
2016-07-124790-014-12402.20 ppb
2016-07-194790-012-12002.60 ppb
2016-07-264790-014-1150ND
2016-08-024790-012-12303.70 ppb
2016-08-164790-012-12302.40 ppb
2016-08-234790-014-10553.40 ppb
2016-08-304790-012-11503.60 ppb
2016-09-064790-012-10553.00 ppb
2016-09-134790-012-10452.70 ppb
2016-09-204790-012-11552.70 ppb
2016-09-274790-014-11403.70 ppb
2016-10-044790-014-10352.30 ppb
2016-10-114790-012-11103.30 ppb
2016-10-194790-014-10553.50 ppb
2016-10-254790-012-12053.80 ppb
2016-11-014790-012-11002.60 ppb
2016-11-024790-004-11507.20 ppb
2016-11-154790-012-10153.30 ppb
2016-11-224790-012-10102.60 ppb
2016-11-294790-014-12452.90 ppb
2016-12-064790-012-11003.50 ppb
2016-12-134790-014-10553.40 ppb
2016-12-204790-012-10553.00 ppb
2016-12-274790-014-11403.40 ppb
2017-01-034790-012-11053.90 ppb
2017-01-174790-012-10404.70 ppb
2017-01-184790-001-11104.90 ppb
2017-01-184790-003-10158.30 ppb
2017-01-184790-004-11407.80 ppb
2017-01-184790-005-11253.50 ppb
2017-01-184790-006-1335ND
2017-01-184790-007-12005.30 ppb
2017-01-184790-008-1245ND
2017-01-184790-009-1315ND
2017-01-184790-010-13002.80 ppb
2017-01-184790-011-12254.20 ppb
2017-01-184790-013-10504.40 ppb
2017-01-244790-014-11253.10 ppb
2017-01-314790-012-10453.30 ppb
2017-02-074790-012-10303.40 ppb
2017-02-144790-014-11552.80 ppb
2017-02-214790-012-11253.10 ppb
2017-02-224790-001-10354.90 ppb
2017-02-224790-003-10057.50 ppb
2017-02-224790-004-11057.90 ppb
2017-02-224790-005-10502.80 ppb
2017-02-224790-006-12152.10 ppb
2017-02-224790-007-11204.60 ppb
2017-02-224790-008-12052.50 ppb
2017-02-224790-009-1235ND
2017-02-224790-010-11453.20 ppb
2017-02-224790-013-10206.40 ppb
2017-02-284790-014-11303.70 ppb
2017-03-074790-012-11102.80 ppb
2017-03-144790-014-12002.70 ppb
2017-03-214790-012-11502.60 ppb
2017-03-284790-014-11352.90 ppb
2017-04-044790-012-12152.00 ppb
2017-04-114790-014-11153.30 ppb
2017-04-184790-012-11203.20 ppb
2017-05-024790-012-10503.20 ppb
2017-05-034790-004-11158.00 ppb
2017-05-094790-014-11153.50 ppb
2017-05-164790-012-09353.30 ppb
2017-05-234790-014-11352.40 ppb
2017-05-304790-012-11052.20 ppb
2017-06-064790-012-11153.20 ppb
2017-06-134790-014-11302.80 ppb
2017-06-274790-014-10403.10 ppb
2017-07-034790-012-11353.20 ppb
2017-07-184790-012-1045ND
2017-07-254790-014-10152.40 ppb
2017-07-264790-004-11407.90 ppb
2017-08-014790-012-11053.00 ppb
2017-08-154790-012-11402.30 ppb
2017-08-224790-014-11452.20 ppb
2017-09-054790-012-1220ND
2017-09-124790-014-1105ND
2017-09-194790-012-11502.40 ppb
2017-09-264790-014-1120ND
2017-10-034790-014-11203.20 ppb
2017-10-104790-012-11452.90 ppb
2017-10-164790-014-11002.20 ppb
2017-10-244790-012-1200ND
2017-10-254790-004-11406.50 ppb
2017-10-314790-014-12002.50 ppb
2017-11-074790-012-11202.20 ppb
2017-11-144790-014-1140ND
2017-11-214790-012-1120ND
2017-11-284790-014-11353.00 ppb
2017-12-124790-014-11302.70 ppb
2017-12-194790-012-1045ND
2017-12-264790-014-12004.30 ppb
2018-01-024790-012-11003.20 ppb
2018-01-114790-014-10302.50 ppb
2018-01-164790-012-1140ND
2018-01-234790-014-12003.20 ppb
2018-01-244790-004-11308.60 ppb
2018-01-304790-012-12002.60 ppb
2018-02-064790-012-11252.40 ppb
2018-02-134790-014-11502.10 ppb
2018-02-204790-012-11103.40 ppb
2018-02-274790-001-11404.90 ppb
2018-02-274790-003-11007.50 ppb
2018-02-274790-004-12307.90 ppb
2018-02-274790-005-12003.00 ppb
2018-02-274790-006-1255ND
2018-02-274790-007-13204.50 ppb
2018-02-274790-013-11205.10 ppb
2018-02-274790-014-11503.10 ppb
2018-02-284790-008-1145ND
2018-02-284790-009-1200ND
2018-02-284790-010-11002.90 ppb
2018-02-284790-011-11302.20 ppb
2018-03-064790-012-10502.70 ppb
2018-03-134790-014-11552.30 ppb
2018-03-204790-012-11002.90 ppb
2018-03-274790-014-11302.10 ppb
2018-04-034790-014-11152.30 ppb
2018-04-104790-012-11402.40 ppb
2018-04-174790-014-11203.10 ppb
2018-05-014790-012-11252.40 ppb
2018-05-084790-014-1130ND
2018-05-154790-012-12252.50 ppb
2018-05-224790-014-12202.60 ppb
2018-05-294790-012-12152.80 ppb
2018-05-304790-004-12207.90 ppb
2018-06-054790-012-11252.20 ppb
2018-06-124790-014-13152.90 ppb
2018-06-264790-014-12402.10 ppb
2018-07-034790-012-1145ND
2018-07-104790-014-12002.30 ppb
2018-07-174790-012-12502.90 ppb
2018-07-184790-004-11405.90 ppb
2018-07-244790-014-12003.50 ppb
2018-07-314790-012-12102.40 ppb
2018-08-074790-012-12402.30 ppb
2018-08-144790-014-11102.30 ppb
2018-08-214790-012-11103.90 ppb
2018-08-284790-014-1100ND
2018-09-044790-012-12003.10 ppb
2018-09-184790-012-12303.10 ppb
2018-09-254790-014-12002.70 ppb
2018-10-024790-014-12202.30 ppb
2018-10-094790-012-12002.10 ppb
2018-10-164790-014-1200ND
2018-10-234790-012-1230ND
2018-10-304790-014-12002.80 ppb
2018-10-314790-004-11008.30 ppb
2018-11-064790-012-1235ND
2018-11-134790-014-1130ND
2018-11-204790-012-12302.60 ppb
2018-11-274790-014-1200ND
2018-12-044790-012-12002.00 ppb
2018-12-114790-014-12202.00 ppb
2018-12-184790-012-12002.70 ppb
2018-12-264790-014-1140ND
2019-01-024790-012-1200ND
2019-01-084790-014-1200ND
2019-01-154790-012-1210ND
2019-01-224790-014-1150ND
2019-01-294790-012-12002.00 ppb
2019-01-304790-001-11002.30 ppb
2019-01-304790-003-10406.30 ppb
2019-01-304790-004-11207.00 ppb
2019-01-304790-005-11102.30 ppb
2019-01-304790-006-1220ND
2019-01-304790-007-11305.90 ppb
2019-01-304790-008-1200ND
2019-01-304790-009-1210ND
2019-01-304790-010-11502.70 ppb
2019-01-304790-011-11402.50 ppb
2019-01-304790-013-10507.10 ppb
2019-02-054790-012-13002.60 ppb
2019-02-124790-014-1220ND
2019-02-194790-012-1200ND
2019-02-264790-014-1200ND
2019-03-124790-014-12002.30 ppb
2019-03-194790-012-1220ND
2019-03-264790-014-1200ND
2019-04-024790-014-1230ND
2019-04-094790-012-12002.50 ppb
2019-04-164790-012-12002.00 ppb
2019-04-174790-004-10558.50 ppb
2019-04-234790-014-1200ND
2019-04-304790-014-1200ND
2019-05-074790-012-1230ND
2019-05-144790-014-11402.70 ppb
2019-05-214790-012-12302.20 ppb
2019-05-284790-014-11402.30 ppb
2019-06-044790-012-1200ND
2019-06-114790-014-12002.60 ppb
2019-06-184790-012-12302.80 ppb
2019-06-254790-012-1200ND
2019-07-024790-012-12202.10 ppb
2019-07-094790-014-11453.50 ppb
2019-07-164790-012-12103.30 ppb
2019-07-234790-014-12002.60 ppb
2019-07-304790-012-11102.60 ppb
2019-07-314790-004-11158.60 ppb
2019-08-064790-012-11102.20 ppb
2019-08-134790-014-10352.80 ppb
2019-08-204790-012-12102.70 ppb
2019-08-274790-014-11402.60 ppb
2019-09-034790-012-12303.60 ppb
2019-09-104790-014-11402.40 ppb
2019-09-174790-012-12002.90 ppb
2019-09-254790-014-12003.20 ppb
2019-10-014790-014-12302.40 ppb
2019-10-084790-012-11002.40 ppb
2019-10-154790-014-12002.70 ppb
2019-10-224790-012-12003.30 ppb
2019-10-234790-004-11208.40 ppb
2019-10-294790-012-13202.40 ppb
2019-11-054790-012-12302.70 ppb
2019-11-124790-012-12002.90 ppb
2019-11-194790-012-13302.50 ppb
2019-11-264790-012-1240ND
2019-12-034790-012-12202.10 ppb
2019-12-104790-012-1230ND
2019-12-174790-012-1230ND
2019-12-244790-012-1230ND
2019-12-314790-012-1130ND