Know Your Environment. Protect Your Health.

Arsenic

East Walnut Grove [sws]

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.

 

208

Samples

73

Samples exceeding legal limit (MCL)

174

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20187.09 ppb3726ND - 18.0 ppb
20198.83 ppb39393.80 ppb - 15.0 ppb
20209.43 ppb3733ND - 15.0 ppb
20217.01 ppb3727ND - 17.0 ppb
20227.85 ppb3326ND - 16.0 ppb
20237.80 ppb2523ND - 16.0 ppb

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
2018-01-16CA3400106_001_001-20180116111615.0 ppb
2018-01-16CA3400106_008_008-2018011611189.10 ppb
2018-01-16CA3400106_009_009-2018011611209.90 ppb
2018-02-13CA3400106_009_009-201802131048ND
2018-02-13CA3400106_001_001-20180213104515.0 ppb
2018-02-13CA3400106_008_008-201802131047ND
2018-03-26CA3400106_008_008-201803261120ND
2018-03-26CA3400106_009_009-201803261121ND
2018-03-26CA3400106_001_001-20180326112215.0 ppb
2018-04-10CA3400106_001_001-20180410130117.0 ppb
2018-04-10CA3400106_008_008-201804101304ND
2018-04-10CA3400106_009_009-201804101306ND
2018-05-14CA3400106_001_001-20180514111815.0 ppb
2018-05-14CA3400106_008_008-201805141122ND
2018-05-14CA3400106_009_009-201805141123ND
2018-06-11CA3400106_008_008-201806111250ND
2018-06-11CA3400106_009_009-201806111252ND
2018-06-11CA3400106_001_001-20180611124815.0 ppb
2018-07-17CA3400106_001_001-20180717094514.0 ppb
2018-07-17CA3400106_009_009-201807170947ND
2018-07-17CA3400106_008_008-2018071709462.10 ppb
2018-08-27CA3400106_001_001-20180827101215.0 ppb
2018-08-27CA3400106_009_009-2018082710183.20 ppb
2018-08-27CA3400106_008_008-2018082710173.50 ppb
2018-09-17CA3400106_009_009-2018091710104.10 ppb
2018-09-17CA3400106_001_001-20180917100715.0 ppb
2018-09-17CA3400106_008_008-2018091710095.50 ppb
2018-10-17CA3400106_008_008-2018101709233.50 ppb
2018-10-17CA3400106_001_001-20181017092215.0 ppb
2018-10-17CA3400106_009_009-2018101709243.20 ppb
2018-11-13CA3400106_007_007-20181113095718.0 ppb
2018-11-21CA3400106_001_001-20181121084815.0 ppb
2018-11-21CA3400106_009_009-2018112108504.60 ppb
2018-11-21CA3400106_008_008-2018112108494.20 ppb
2018-12-19CA3400106_009_009-2018121908475.20 ppb
2018-12-19CA3400106_008_008-2018121908465.40 ppb
2018-12-19CA3400106_001_001-20181219084515.0 ppb
2019-01-29CA3400106_009_009-2019012910173.80 ppb
2019-01-29CA3400106_001_001-20190129101514.0 ppb
2019-01-29CA3400106_008_008-2019012910184.30 ppb
2019-02-19CA3400106_008_008-2019021914145.40 ppb
2019-02-19CA3400106_001_001-20190219141315.0 ppb
2019-02-19CA3400106_009_009-2019021914155.30 ppb
2019-03-19CA3400106_001_001-20190319102515.0 ppb
2019-03-19CA3400106_008_008-2019031910285.40 ppb
2019-03-19CA3400106_009_009-2019031910295.40 ppb
2019-04-18CA3400106_001_001-20190418091114.0 ppb
2019-04-18CA3400106_008_008-2019041809135.60 ppb
2019-04-18CA3400106_009_009-2019041809165.40 ppb
2019-05-21CA3400106_001_001-20190521104414.0 ppb
2019-05-21CA3400106_008_008-2019052110484.80 ppb
2019-05-21CA3400106_009_009-2019052110504.70 ppb
2019-06-17CA3400106_001_001-20190617090215.0 ppb
2019-06-17CA3400106_009_009-2019061709065.90 ppb
2019-06-17CA3400106_008_008-2019061709055.60 ppb
2019-07-09CA3400106_009_009-2019070910296.00 ppb
2019-07-09CA3400106_001_001-20190709102214.0 ppb
2019-07-09CA3400106_008_008-2019070910266.00 ppb
2019-08-22CA3400106_001_001-20190822103814.0 ppb
2019-08-22CA3400106_009_009-2019082210417.60 ppb
2019-08-22CA3400106_008_008-2019082210408.50 ppb
2019-09-09CA3400106_001_001-20190909121314.0 ppb
2019-09-09CA3400106_009_009-2019090912176.40 ppb
2019-09-09CA3400106_008_008-2019090912156.60 ppb
2019-10-23CA3400106_001_001-20191023102514.0 ppb
2019-10-23CA3400106_008_008-2019102310277.90 ppb
2019-10-23CA3400106_009_009-2019102310307.30 ppb
2019-11-04CA3400106_008_008-2019110410567.00 ppb
2019-11-04CA3400106_009_009-2019110410587.40 ppb
2019-11-04CA3400106_001_001-20191104105414.0 ppb
2019-11-21CA3400106_008_008-2019112109266.40 ppb
2019-11-21CA3400106_009_009-2019112109297.00 ppb
2019-11-21CA3400106_001_001-20191121092513.0 ppb
2019-12-19CA3400106_009_009-2019121908317.20 ppb
2019-12-19CA3400106_001_001-20191219082514.0 ppb
2019-12-19CA3400106_008_008-2019121908277.50 ppb
2020-01-07CA3400106_001_001-20200107110215.0 ppb
2020-01-07CA3400106_008_008-2020010711137.90 ppb
2020-01-07CA3400106_009_009-2020010711147.90 ppb
2020-02-11CA3400106_001_001-20200211082714.0 ppb
2020-02-20CA3400106_008_008-2020022010488.30 ppb
2020-02-20CA3400106_009_009-2020022010488.00 ppb
2020-02-20CA3400106_001_001-20200220104814.0 ppb
2020-03-25CA3400106_001_001-20200325064115.0 ppb
2020-03-25CA3400106_008_008-2020032506427.50 ppb
2020-03-25CA3400106_009_009-2020032506427.90 ppb
2020-04-20CA3400106_001_001-20200420100914.0 ppb
2020-04-20CA3400106_008_008-2020042010128.80 ppb
2020-04-20CA3400106_009_009-2020042010149.20 ppb
2020-05-18CA3400106_008_008-2020051810457.20 ppb
2020-05-18CA3400106_001_001-20200518105014.0 ppb
2020-05-18CA3400106_009_009-2020051810467.10 ppb
2020-06-29CA3400106_009_009-2020062909319.60 ppb
2020-06-29CA3400106_001_001-20200629092915.0 ppb
2020-06-29CA3400106_008_008-2020062909308.80 ppb
2020-07-20CA3400106_001_001-20200720113613.0 ppb
2020-07-20CA3400106_008_008-2020072011377.00 ppb
2020-07-20CA3400106_009_009-2020072011397.40 ppb
2020-08-25CA3400106_001_001-20200825111515.0 ppb
2020-08-25CA3400106_008_008-2020082511159.50 ppb
2020-08-25CA3400106_009_009-20200825111511.0 ppb
2020-09-17CA3400106_008_008-2020091712526.90 ppb
2020-09-17CA3400106_009_009-2020091712546.80 ppb
2020-09-17CA3400106_001_001-20200917125414.0 ppb
2020-10-05CA3400106_001_001-20201005142615.0 ppb
2020-10-05CA3400106_008_008-2020100514267.80 ppb
2020-10-05CA3400106_009_009-2020100514277.30 ppb
2020-11-24CA3400106_008_008-202011241013ND
2020-11-24CA3400106_001_001-20201124101014.0 ppb
2020-11-24CA3400106_009_009-202011241014ND
2020-12-22CA3400106_001_001-20201222084415.0 ppb
2020-12-22CA3400106_008_008-202012220845ND
2020-12-22CA3400106_009_009-202012220845ND
2021-01-07CA3400106_009_009-202101071231ND
2021-01-07CA3400106_001_001-20210107122915.0 ppb
2021-01-07CA3400106_008_008-202101071230ND
2021-02-22CA3400106_001_001-20210222112315.0 ppb
2021-02-22CA3400106_009_009-202102221125ND
2021-02-22CA3400106_008_008-202102221124ND
2021-03-15CA3400106_001_001-20210315135015.0 ppb
2021-03-15CA3400106_008_008-202103151353ND
2021-03-15CA3400106_009_009-202103151353ND
2021-04-21CA3400106_001_001-20210421101514.0 ppb
2021-04-21CA3400106_008_008-202104211016ND
2021-04-21CA3400106_009_009-202104211017ND
2021-05-17CA3400106_009_009-202105171403ND
2021-05-17CA3400106_001_001-20210517140115.0 ppb
2021-05-17CA3400106_008_008-202105171402ND
2021-06-21CA3400106_009_009-2021062112204.00 ppb
2021-06-21CA3400106_001_001-20210621121815.0 ppb
2021-06-21CA3400106_008_008-2021062112202.50 ppb
2021-07-14CA3400106_001_001-20210714102614.0 ppb
2021-07-14CA3400106_009_009-2021071410283.30 ppb
2021-07-14CA3400106_008_008-2021071410272.10 ppb
2021-08-30CA3400106_008_008-2021083012254.10 ppb
2021-08-30CA3400106_001_001-20210830122414.0 ppb
2021-08-30CA3400106_009_009-2021083012255.10 ppb
2021-09-23CA3400106_008_008-2021092313233.10 ppb
2021-09-23CA3400106_009_009-2021092313244.30 ppb
2021-09-23CA3400106_001_001-20210923132215.0 ppb
2021-10-19CA3400106_009_009-2021101912085.30 ppb
2021-10-19CA3400106_008_008-2021101912074.90 ppb
2021-10-19CA3400106_001_001-20211019120615.0 ppb
2021-11-08CA3400106_007_007-20211108091317.0 ppb
2021-11-15CA3400106_001_001-20211115091416.0 ppb
2021-11-15CA3400106_008_008-2021111509155.60 ppb
2021-11-15CA3400106_009_009-2021111509166.40 ppb
2021-12-16CA3400106_001_001-20211216104515.0 ppb
2021-12-16CA3400106_008_008-2021121610486.20 ppb
2021-12-16CA3400106_009_009-2021121610487.30 ppb
2022-01-10CA3400106_009_009-2022011011207.50 ppb
2022-01-10CA3400106_001_001-20220110111816.0 ppb
2022-01-10CA3400106_008_008-2022011011206.20 ppb
2022-02-24CA3400106_008_008-2022022408367.10 ppb
2022-02-24CA3400106_001_001-20220224083515.0 ppb
2022-02-24CA3400106_009_009-2022022408366.00 ppb
2022-03-21CA3400106_009_009-2022032113106.30 ppb
2022-03-21CA3400106_008_008-2022032113105.50 ppb
2022-03-21CA3400106_001_001-20220321130014.0 ppb
2022-04-20CA3400106_001_001-20220420105416.0 ppb
2022-04-20CA3400106_008_008-2022042011428.60 ppb
2022-04-20CA3400106_009_009-20220420114210.00 ppb
2022-05-18CA3400106_001_001-20220518091515.0 ppb
2022-05-18CA3400106_008_008-2022051809156.60 ppb
2022-05-18CA3400106_009_009-2022051809157.50 ppb
2022-06-07CA3400106_001_001-20220607083714.0 ppb
2022-06-07CA3400106_008_008-2022060708407.30 ppb
2022-06-07CA3400106_009_009-2022060708427.80 ppb
2022-08-09CA3400106_008_008-202208091211ND
2022-08-09CA3400106_009_009-202208091211ND
2022-08-09CA3400106_001_001-20220809121014.0 ppb
2022-09-13CA3400106_009_009-202209131045ND
2022-09-13CA3400106_008_008-202209131045ND
2022-09-13CA3400106_001_001-20220913104015.0 ppb
2022-10-24CA3400106_001_001-20221024101915.0 ppb
2022-10-24CA3400106_008_008-202210241020ND
2022-10-24CA3400106_009_009-202210241020ND
2022-11-17CA3400106_008_008-202211171100ND
2022-11-17CA3400106_001_001-20221117105916.0 ppb
2022-11-17CA3400106_009_009-2022111711012.90 ppb
2022-12-19CA3400106_001_001-20221219080014.0 ppb
2022-12-19CA3400106_008_008-2022121908142.70 ppb
2022-12-19CA3400106_009_009-2022121908153.20 ppb
2023-01-11CA3400106_001_001-20230111121013.0 ppb
2023-01-11CA3400106_008_008-202301111212ND
2023-01-11CA3400106_009_009-202301111212ND
2023-02-14CA3400106_001_001-20230214083413.0 ppb
2023-02-27CA3400106_001_001-20230227094514.0 ppb
2023-02-27CA3400106_009_009-2023022709473.90 ppb
2023-02-27CA3400106_008_008-2023022709463.40 ppb
2023-03-28CA3400106_009_009-2023032811404.30 ppb
2023-03-28CA3400106_001_001-20230328113516.0 ppb
2023-03-28CA3400106_008_008-2023032811404.30 ppb
2023-04-20CA3400106_009_009-2023042008345.10 ppb
2023-04-20CA3400106_001_001-20230420083214.0 ppb
2023-04-20CA3400106_008_008-2023042008344.10 ppb
2023-05-09CA3400106_001_001-20230509081715.0 ppb
2023-05-09CA3400106_008_008-2023050908254.00 ppb
2023-05-09CA3400106_009_009-2023050908265.10 ppb
2023-06-22CA3400106_001_001-20230622100313.0 ppb
2023-06-22CA3400106_009_009-2023062210055.80 ppb
2023-06-22CA3400106_008_008-2023062210055.10 ppb
2023-07-12CA3400106_009_009-2023071211455.30 ppb
2023-07-12CA3400106_001_001-20230712114313.0 ppb
2023-07-12CA3400106_008_008-2023071211444.70 ppb
2023-08-21CA3400106_008_008-2023082109007.10 ppb
2023-08-21CA3400106_001_001-20230821090015.0 ppb
2023-08-21CA3400106_009_009-2023082109006.80 ppb