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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Cucamonga Valley Water District

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

 

101

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND310ND
20151.31 ppb82ND - 5.50 ppb
20160.540 ppb51ND - 2.70 ppb
2017ND240ND
20180.0828 ppb291ND - 2.40 ppb
2019ND40ND

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
2014-02-273761-038-1255ND
2014-05-293761-033-0940ND
2014-06-053761-027-1045ND
2014-06-183761-051-1138ND
2014-06-193761-050-1035ND
2014-06-193761-052-0930ND
2014-06-193761-053-0925ND
2014-06-193761-054-0940ND
2014-06-263761-008-1015ND
2014-06-263761-010-1103ND
2014-06-263761-029-1052ND
2014-06-263761-034-1042ND
2014-06-263761-035-1007ND
2014-06-263761-035-1022ND
2014-07-103761-002-1103ND
2014-07-103761-003-1052ND
2014-07-103761-004-1022ND
2014-07-103761-025-1042ND
2014-07-103761-037-1007ND
2014-07-103761-042-1015ND
2014-08-053761-055-1150ND
2014-08-143761-001-0917ND
2014-08-143761-016-1105ND
2014-08-143761-022-0842ND
2014-08-183761-033-1050ND
2014-08-213761-023-0930ND
2014-08-213761-024-0940ND
2014-09-043761-027-1010ND
2014-10-163761-039-1050ND
2014-11-203761-033-1145ND
2014-12-093761-027-1040ND
2015-03-053761-027-0855ND
2015-05-133761-055-1050ND
2015-06-113761-001-1020ND
2015-06-113761-022-1035ND
2015-07-093761-017-11005.50 ppb
2015-08-203761-055-0925ND
2015-09-013761-017-09335.00 ppb
2015-11-233761-055-0900ND
2016-02-113761-055-1040ND
2016-07-213761-001-0930ND
2016-07-213761-017-11202.70 ppb
2016-07-213761-022-0955ND
2016-11-233761-035-1440ND
2017-06-023761-027-0918ND
2017-06-143761-035-0930ND
2017-06-143761-038-1026ND
2017-06-143761-039-0959ND
2017-06-153761-008-0931ND
2017-06-153761-033-1047ND
2017-06-153761-034-0910ND
2017-06-193761-042-0859ND
2017-06-193761-053-0908ND
2017-06-223761-003-0806ND
2017-06-223761-025-0818ND
2017-06-223761-052-0913ND
2017-06-223761-053-0902ND
2017-06-263761-002-0929ND
2017-06-263761-054-1041ND
2017-06-283761-050-0744ND
2017-06-283761-051-0735ND
2017-07-033761-055-1041ND
2017-07-123761-017-1408ND
2017-07-133761-001-0733ND
2017-07-133761-010-1305ND
2017-07-133761-022-0928ND
2017-07-133761-029-1319ND
2017-07-173761-004-1231ND
2018-03-143761-016-1008ND
2018-03-143761-023-1149ND
2018-03-283761-024-0931ND
2018-06-209588-008-1044ND
2018-06-209588-027-1105ND
2018-06-209588-029-1228ND
2018-06-209588-034-1200ND
2018-06-209588-038-1138ND
2018-06-219588-003-0848ND
2018-06-219588-025-0832ND
2018-06-219588-037-0914ND
2018-06-219588-050-1244ND
2018-06-219588-051-0815ND
2018-06-259588-004-0941ND
2018-06-259588-035-1127ND
2018-06-269588-052-0925ND
2018-06-269588-053-1000ND
2018-06-269588-054-1035ND
2018-06-279588-033-1020ND
2018-06-279588-055-1140ND
2018-07-039588-010-0917ND
2018-07-119588-002-1000ND
2018-07-119588-042-0950ND
2018-07-129588-017-12142.40 ppb
2018-07-189588-001-0950ND
2018-07-189588-022-1010ND
2018-07-269588-016-0846ND
2018-07-269588-023-0912ND
2018-07-269588-024-0904ND
2019-07-019588-017-0945ND
2019-07-249588-017-1115ND
2019-07-269588-001-0900ND
2019-07-269588-022-0915ND