Know Your Environment. Protect Your Health.

Arsenic

California Water Service Company Las Lomas

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.

 

70

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND90ND
2019ND70ND
2020ND130ND
2021ND70ND
2022ND160ND
2023ND180ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-01-04CA2710013_009_009-201801041052ND
2018-02-06CA2710013_004_004-201802061348ND
2018-02-06CA2710013_009_009-201802061346ND
2018-02-06CA2710013_003_003-201802061402ND
2018-03-15CA2710013_009_009-201803151008ND
2018-05-01CA2710013_003_003-201805011410ND
2018-08-02CA2710013_003_003-201808021003ND
2018-11-08CA2710013_003_003-201811081106ND
2018-12-18CA2710013_009_009-201812181204ND
2019-02-05CA2710013_003_003-201902051043ND
2019-03-05CA2710013_009_009-201903051031ND
2019-04-09CA2710013_009_009-201904091005ND
2019-05-07CA2710013_003_003-201905071117ND
2019-08-06CA2710013_003_003-201908061306ND
2019-08-07CA2710013_003_003-201908071410ND
2019-11-15CA2710013_003_003-201911151349ND
2020-02-04CA2710013_009_009-202002041250ND
2020-02-04CA2710013_004_004-202002041246ND
2020-02-04CA2710013_003_003-202002041326ND
2020-05-06CA2710013_003_003-202005061034ND
2020-05-06CA2710013_009_009-202005061103ND
2020-05-06CA2710013_004_004-202005061100ND
2020-08-12CA2710013_004_004-202008121414ND
2020-08-13CA2710013_003_003-202008131024ND
2020-08-13CA2710013_004_004-202008131031ND
2020-10-07CA2710013_009_009-202010071018ND
2020-11-05CA2710013_004_004-202011051152ND
2020-11-05CA2710013_009_009-202011051154ND
2020-11-05CA2710013_003_003-202011051331ND
2021-02-11CA2710013_003_003-202102110914ND
2021-05-11CA2710013_003_003-202105111330ND
2021-05-11CA2710013_003_003-202105111329ND
2021-06-29CA2710013_009_009-202106290956ND
2021-08-11CA2710013_003_003-202108111016ND
2021-09-21CA2710013_001_001-202109211255ND
2021-11-18CA2710013_003_003-202111181139ND
2022-02-01CA2710013_003_003-202202010953ND
2022-04-18CA2710013_009_009-202204181001ND
2022-05-03CA2710013_003_003-202205031114ND
2022-05-03CA2710013_009_009-202205031058ND
2022-05-03CA2710013_004_004-202205031056ND
2022-06-01CA2710013_009_009-202206011014ND
2022-07-12CA2710013_009_009-202207121135ND
2022-08-03CA2710013_003_003-202208031410ND
2022-08-03CA2710013_009_009-202208031346ND
2022-08-03CA2710013_004_004-202208031345ND
2022-08-03CA2710013_003_003-202208031403ND
2022-10-14CA2710013_009_009-202210141022ND
2022-11-28CA2710013_009_009-202211281206ND
2022-11-28CA2710013_004_004-202211281205ND
2022-11-30CA2710013_003_003-202211301020ND
2022-12-08CA2710013_009_009-202212081144ND
2023-02-07CA2710013_004_004-202302071435ND
2023-02-07CA2710013_009_009-202302071436ND
2023-02-07CA2710013_003_003-202302071401ND
2023-03-08CA2710013_009_009-202303081137ND
2023-04-14CA2710013_009_009-202304141505ND
2023-05-02CA2710013_003_003-202305021048ND
2023-05-02CA2710013_009_009-202305021022ND
2023-05-02CA2710013_004_004-202305021021ND
2023-06-15CA2710013_009_009-202306151209ND
2023-08-10CA2710013_004_004-202308101036ND
2023-08-10CA2710013_003_003-202308101014ND
2023-08-10CA2710013_009_009-202308101037ND
2023-08-23CA2710013_004_004-202308231314ND
2023-09-13CA2710013_009_009-202309131043ND
2023-10-24CA2710013_009_009-202310241310ND
2023-11-07CA2710013_004_004-202311071029ND
2023-11-07CA2710013_009_009-202311071030ND
2023-11-07CA2710013_003_003-202311071041ND