Know Your Environment. Protect Your Health.

Arsenic

Hillview Water Company-oakhurst/sierra Lakes

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.

 

594

Samples

116

Samples exceeding legal limit (MCL)

486

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201810.2 ppb3227ND - 26.0 ppb
201910.9 ppb9578ND - 43.0 ppb
20209.27 ppb8574ND - 44.0 ppb
20215.58 ppb124117ND - 33.0 ppb
20225.66 ppb123108ND - 34.0 ppb
20234.70 ppb13582ND - 42.0 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
2018-01-02CA2010007_039_039-2018010213158.20 ppb
2018-03-01CA2010007_031_031-20180301082522.0 ppb
2018-03-01CA2010007_030_030-20180301081317.0 ppb
2018-03-01CA2010007_001_001-2018030109084.60 ppb
2018-04-03CA2010007_039_039-2018040309437.00 ppb
2018-04-30CA2010007_047_047-2018043014107.50 ppb
2018-04-30CA2010007_024_024-2018043014456.50 ppb
2018-04-30CA2010007_046_046-2018043014104.50 ppb
2018-04-30CA2010007_048_048-2018043014325.00 ppb
2018-06-12CA2010007_001_001-2018061214502.30 ppb
2018-06-12CA2010007_030_030-20180612110517.0 ppb
2018-06-12CA2010007_031_031-20180612111026.0 ppb
2018-07-10CA2010007_039_039-2018071013264.70 ppb
2018-07-25CA2010007_009_009-20180725100022.0 ppb
2018-07-25CA2010007_010_010-20180725102519.0 ppb
2018-09-12CA2010007_024_024-20180912085513.0 ppb
2018-09-12CA2010007_001_001-2018091208488.60 ppb
2018-09-12CA2010007_030_030-20180912094517.0 ppb
2018-09-12CA2010007_031_031-20180912101517.0 ppb
2018-09-19CA2010007_001_001-2018091909113.60 ppb
2018-10-09CA2010007_039_039-2018100911466.30 ppb
2018-12-04CA2010007_013_013-201812041646ND
2018-12-04CA2010007_027_027-20181204164624.0 ppb
2018-12-04CA2010007_030_030-20181204100217.0 ppb
2018-12-05CA2010007_024_024-2018120509224.60 ppb
2018-12-05CA2010007_001_001-2018120509003.60 ppb
2018-12-11CA2010007_013_013-201812111238ND
2018-12-11CA2010007_050_050-20181211121821.0 ppb
2018-12-18CA2010007_013_013-201812181026ND
2018-12-18CA2010007_027_027-201812181008ND
2018-12-27CA2010007_013_013-201812271309ND
2018-12-27CA2010007_027_027-20181227125818.0 ppb
2019-01-02CA2010007_013_013-2019010211052.30 ppb
2019-01-02CA2010007_027_027-20190102110515.0 ppb
2019-01-08CA2010007_027_027-20190108101612.0 ppb
2019-01-08CA2010007_013_013-201901081018ND
2019-01-15CA2010007_013_013-2019011510493.20 ppb
2019-01-15CA2010007_027_027-20190115104727.0 ppb
2019-01-21CA2010007_013_013-2019012113244.60 ppb
2019-01-21CA2010007_027_027-20190121132015.0 ppb
2019-02-01CA2010007_027_027-20190201115519.0 ppb
2019-02-01CA2010007_013_013-2019020112004.10 ppb
2019-02-07CA2010007_013_013-2019020715054.80 ppb
2019-02-07CA2010007_027_027-20190207150018.0 ppb
2019-02-12CA2010007_027_027-20190212104413.0 ppb
2019-02-12CA2010007_013_013-2019021210473.10 ppb
2019-02-20CA2010007_013_013-2019022009572.30 ppb
2019-02-20CA2010007_027_027-20190220095443.0 ppb
2019-02-26CA2010007_013_013-2019022609462.70 ppb
2019-02-26CA2010007_027_027-20190226094311.0 ppb
2019-03-06CA2010007_030_030-20190306085514.0 ppb
2019-03-06CA2010007_013_013-2019030610172.50 ppb
2019-03-06CA2010007_024_024-2019030609104.20 ppb
2019-03-06CA2010007_027_027-20190306102017.0 ppb
2019-03-06CA2010007_031_031-20190306091024.0 ppb
2019-03-12CA2010007_013_013-2019031209202.80 ppb
2019-03-12CA2010007_027_027-20190312091435.0 ppb
2019-03-19CA2010007_027_027-20190319094020.0 ppb
2019-03-19CA2010007_013_013-201903190943ND
2019-03-26CA2010007_027_027-20190326091520.0 ppb
2019-03-26CA2010007_013_013-201903260918ND
2019-04-02CA2010007_013_013-201904020942ND
2019-04-02CA2010007_027_027-20190402093917.0 ppb
2019-04-09CA2010007_013_013-201904091535ND
2019-04-09CA2010007_027_027-20190409152921.0 ppb
2019-04-16CA2010007_013_013-201904161004ND
2019-04-16CA2010007_027_027-20190416100417.0 ppb
2019-04-23CA2010007_027_027-20190423093016.0 ppb
2019-04-23CA2010007_013_013-201904230933ND
2019-04-30CA2010007_013_013-201904300913ND
2019-04-30CA2010007_027_027-20190430090617.0 ppb
2019-05-07CA2010007_027_027-20190507092418.0 ppb
2019-05-07CA2010007_013_013-2019050709302.20 ppb
2019-05-14CA2010007_027_027-20190514093320.0 ppb
2019-05-14CA2010007_013_013-201905140939ND
2019-05-21CA2010007_013_013-201905210855ND
2019-05-21CA2010007_027_027-20190521085018.0 ppb
2019-05-28CA2010007_013_013-2019052810562.10 ppb
2019-05-28CA2010007_027_027-20190528105325.0 ppb
2019-06-04CA2010007_013_013-201906040851ND
2019-06-04CA2010007_027_027-20190604084621.0 ppb
2019-06-12CA2010007_027_027-20190612101019.0 ppb
2019-06-12CA2010007_013_013-201906121025ND
2019-06-18CA2010007_027_027-20190618112122.0 ppb
2019-06-18CA2010007_013_013-2019061811242.50 ppb
2019-06-24CA2010007_001_001-2019062409353.70 ppb
2019-06-24CA2010007_024_024-2019062410507.20 ppb
2019-06-25CA2010007_013_013-201906251120ND
2019-06-25CA2010007_027_027-20190625111520.0 ppb
2019-07-02CA2010007_013_013-201907021438ND
2019-07-02CA2010007_027_027-20190702143322.0 ppb
2019-07-09CA2010007_027_027-20190709101322.0 ppb
2019-07-09CA2010007_013_013-201907091015ND
2019-07-16CA2010007_027_027-20190716100221.0 ppb
2019-07-16CA2010007_013_013-201907161011ND
2019-07-23CA2010007_027_027-20190723093923.0 ppb
2019-07-23CA2010007_013_013-2019072309422.60 ppb
2019-07-30CA2010007_013_013-2019073014582.50 ppb
2019-07-30CA2010007_027_027-20190730145322.0 ppb
2019-07-31CA2010007_024_024-2019073110563.60 ppb
2019-07-31CA2010007_001_001-2019073110254.40 ppb
2019-08-06CA2010007_013_013-2019080609472.60 ppb
2019-08-06CA2010007_027_027-20190806094424.0 ppb
2019-08-13CA2010007_013_013-2019081311232.80 ppb
2019-08-13CA2010007_027_027-20190813112021.0 ppb
2019-08-20CA2010007_013_013-2019082010322.40 ppb
2019-08-20CA2010007_027_027-20190820103127.0 ppb
2019-08-27CA2010007_027_027-20190827114323.0 ppb
2019-08-27CA2010007_013_013-2019082711453.00 ppb
2019-09-03CA2010007_027_027-20190903115223.0 ppb
2019-09-03CA2010007_013_013-2019090311542.20 ppb
2019-09-10CA2010007_013_013-2019091011142.50 ppb
2019-09-10CA2010007_027_027-20190910110823.0 ppb
2019-09-17CA2010007_013_013-2019091715502.20 ppb
2019-09-17CA2010007_027_027-20190917154823.0 ppb
2019-09-24CA2010007_027_027-20190924094224.0 ppb
2019-09-24CA2010007_013_013-2019092409442.40 ppb
2019-10-01CA2010007_013_013-2019100112413.60 ppb
2019-10-01CA2010007_027_027-20191001120926.0 ppb
2019-10-14CA2010007_024_024-2019101410132.70 ppb
2019-10-14CA2010007_001_001-2019101409003.30 ppb
2019-11-05CA2010007_027_027-20191105092424.0 ppb
2019-11-05CA2010007_013_013-2019110509262.40 ppb
2019-12-03CA2010007_027_027-20191203131521.0 ppb
2019-12-03CA2010007_013_013-201912031318ND
2019-12-11CA2010007_039_039-2019121108503.70 ppb
2019-12-11CA2010007_041_041-2019121109056.60 ppb
2020-01-07CA2010007_027_027-20200107145022.0 ppb
2020-01-07CA2010007_013_013-2020010714522.40 ppb
2020-02-04CA2010007_027_027-20200204143636.0 ppb
2020-02-04CA2010007_013_013-2020020414082.80 ppb
2020-03-03CA2010007_027_027-20200303100723.0 ppb
2020-03-03CA2010007_013_013-202003031009ND
2020-03-09CA2010007_017_017-202003091050ND
2020-03-09CA2010007_032_032-20200309094540.0 ppb
2020-03-09CA2010007_031_031-20200309093021.0 ppb
2020-03-09CA2010007_033_033-20200309100043.0 ppb
2020-03-09CA2010007_030_030-20200309091414.0 ppb
2020-03-23CA2010007_034_034-20200323101522.0 ppb
2020-04-07CA2010007_013_013-2020040710302.60 ppb
2020-04-07CA2010007_027_027-20200407102723.0 ppb
2020-05-04CA2010007_028_028-202005041025ND
2020-05-04CA2010007_003_003-2020050410003.50 ppb
2020-05-04CA2010007_002_002-202005041011ND
2020-05-05CA2010007_007_007-20200505081416.0 ppb
2020-05-05CA2010007_027_027-20200505095822.0 ppb
2020-05-05CA2010007_013_013-202005051000ND
2020-06-02CA2010007_013_013-2020060212522.50 ppb
2020-06-02CA2010007_027_027-20200602123122.0 ppb
2020-07-08CA2010007_013_013-2020070812395.00 ppb
2020-07-08CA2010007_027_027-20200708123726.0 ppb
2020-07-08CA2010007_051_051-2020070810475.00 ppb
2020-07-15CA2010007_013_013-2020071510283.00 ppb
2020-07-17CA2010007_051_051-202007171107ND
2020-07-21CA2010007_013_013-2020072111204.00 ppb
2020-07-21CA2010007_051_051-2020072110552.00 ppb
2020-07-29CA2010007_013_013-2020072912475.00 ppb
2020-07-29CA2010007_051_051-2020072911173.00 ppb
2020-08-20CA2010007_017_017-202008200820ND
2020-08-20CA2010007_032_032-20200820114837.0 ppb
2020-08-20CA2010007_002_002-202008201343ND
2020-08-20CA2010007_007_007-20200820110216.0 ppb
2020-08-20CA2010007_041_041-2020082012153.00 ppb
2020-08-20CA2010007_030_030-20200820112716.0 ppb
2020-08-20CA2010007_033_033-20200820115544.0 ppb
2020-08-20CA2010007_031_031-20200820114127.0 ppb
2020-08-20CA2010007_034_034-20200820111220.0 ppb
2020-08-20CA2010007_003_003-2020082013543.00 ppb
2020-08-20CA2010007_028_028-202008201132ND
2020-08-20CA2010007_039_039-20200820123010.00 ppb
2020-08-25CA2010007_013_013-2020082510554.00 ppb
2020-08-25CA2010007_051_051-2020082511072.00 ppb
2020-09-02CA2010007_027_027-20200902131427.0 ppb
2020-09-02CA2010007_051_051-2020090211093.00 ppb
2020-09-02CA2010007_013_013-2020090213175.00 ppb
2020-09-09CA2010007_013_013-2020090913304.00 ppb
2020-09-09CA2010007_039_039-2020090911506.00 ppb
2020-09-09CA2010007_051_051-2020090907482.00 ppb
2020-09-14CA2010007_051_051-2020091413133.00 ppb
2020-09-14CA2010007_013_013-2020091414053.00 ppb
2020-09-22CA2010007_051_051-2020092212072.00 ppb
2020-09-22CA2010007_013_013-2020092213224.00 ppb
2020-09-29CA2010007_013_013-2020092912406.00 ppb
2020-09-29CA2010007_051_051-2020092911203.00 ppb
2020-10-06CA2010007_051_051-2020100611556.00 ppb
2020-10-06CA2010007_013_013-2020100614453.00 ppb
2020-10-13CA2010007_013_013-2020101312453.00 ppb
2020-10-13CA2010007_051_051-2020101311076.00 ppb
2020-10-21CA2010007_013_013-2020102114114.00 ppb
2020-10-21CA2010007_051_051-2020102110514.00 ppb
2020-10-28CA2010007_013_013-2020102813375.00 ppb
2020-10-28CA2010007_051_051-2020102811335.00 ppb
2020-11-04CA2010007_027_027-20201104120027.0 ppb
2020-11-04CA2010007_050_050-20201104130333.0 ppb
2020-11-04CA2010007_014_014-202011041550ND
2020-11-05CA2010007_013_013-2020110512506.00 ppb
2020-11-11CA2010007_013_013-2020111113376.00 ppb
2020-11-11CA2010007_051_051-2020111113104.00 ppb
2020-11-17CA2010007_051_051-2020111714513.00 ppb
2020-11-17CA2010007_013_013-2020111713125.00 ppb
2020-11-24CA2010007_013_013-2020112413154.00 ppb
2020-11-24CA2010007_051_051-2020112412244.00 ppb
2020-12-02CA2010007_013_013-2020120212102.00 ppb
2020-12-02CA2010007_051_051-2020120211002.00 ppb
2020-12-09CA2010007_013_013-2020120911503.00 ppb
2020-12-09CA2010007_051_051-202012091340ND
2020-12-15CA2010007_051_051-2020121514055.00 ppb
2020-12-15CA2010007_013_013-2020121516185.00 ppb
2020-12-22CA2010007_013_013-2020122212057.00 ppb
2020-12-22CA2010007_051_051-2020122214303.00 ppb
2020-12-29CA2010007_013_013-2020122914125.00 ppb
2020-12-29CA2010007_051_051-2020122911077.00 ppb
2021-01-05CA2010007_013_013-2021010511034.00 ppb
2021-01-05CA2010007_051_051-2021010507503.00 ppb
2021-01-13CA2010007_013_013-2021011309263.00 ppb
2021-01-13CA2010007_051_051-2021011308222.00 ppb
2021-01-21CA2010007_013_013-2021012109306.00 ppb
2021-01-21CA2010007_051_051-2021012109253.00 ppb
2021-01-26CA2010007_051_051-2021012608176.00 ppb
2021-01-26CA2010007_013_013-2021012610205.00 ppb
2021-02-02CA2010007_051_051-2021020209023.00 ppb
2021-02-02CA2010007_027_027-20210202110823.0 ppb
2021-02-02CA2010007_013_013-2021020211114.00 ppb
2021-02-02CA2010007_050_050-20210202105728.0 ppb
2021-02-10CA2010007_013_013-2021021010356.00 ppb
2021-02-10CA2010007_051_051-2021021009154.00 ppb
2021-02-17CA2010007_051_051-2021021711035.00 ppb
2021-02-17CA2010007_040_040-2021021711055.00 ppb
2021-02-17CA2010007_013_013-2021021711555.00 ppb
2021-02-22CA2010007_051_051-2021022210533.00 ppb
2021-02-22CA2010007_013_013-2021022212473.00 ppb
2021-03-03CA2010007_051_051-2021030309313.00 ppb
2021-03-03CA2010007_013_013-2021030310483.00 ppb
2021-03-08CA2010007_013_013-2021030809144.00 ppb
2021-03-08CA2010007_051_051-2021030807454.00 ppb
2021-03-17CA2010007_013_013-2021031710333.00 ppb
2021-03-17CA2010007_051_051-2021031709102.00 ppb
2021-03-22CA2010007_013_013-2021032211554.00 ppb
2021-03-22CA2010007_051_051-2021032210492.00 ppb
2021-03-29CA2010007_013_013-2021032910163.00 ppb
2021-03-29CA2010007_051_051-202103290800ND
2021-04-07CA2010007_051_051-2021040709032.00 ppb
2021-04-07CA2010007_013_013-2021040710114.00 ppb
2021-04-14CA2010007_051_051-2021041408073.00 ppb
2021-04-14CA2010007_013_013-2021041410324.00 ppb
2021-04-19CA2010007_013_013-2021041909504.00 ppb
2021-04-19CA2010007_051_051-2021041908572.00 ppb
2021-04-27CA2010007_013_013-2021042708423.00 ppb
2021-04-27CA2010007_051_051-202104270805ND
2021-05-04CA2010007_027_027-20210504123322.0 ppb
2021-05-04CA2010007_013_013-2021050412392.00 ppb
2021-05-04CA2010007_051_051-2021050408403.00 ppb
2021-05-04CA2010007_050_050-20210504122728.0 ppb
2021-05-11CA2010007_013_013-2021051108323.00 ppb
2021-05-11CA2010007_051_051-2021051108034.00 ppb
2021-05-18CA2010007_013_013-2021051813174.00 ppb
2021-05-18CA2010007_051_051-2021051808123.00 ppb
2021-05-26CA2010007_013_013-2021052609124.00 ppb
2021-05-26CA2010007_051_051-2021052608253.00 ppb
2021-06-01CA2010007_051_051-2021060108094.00 ppb
2021-06-01CA2010007_013_013-2021060109314.00 ppb
2021-06-09CA2010007_013_013-2021060909374.00 ppb
2021-06-09CA2010007_051_051-2021060908232.00 ppb
2021-06-15CA2010007_013_013-2021061508524.00 ppb
2021-06-15CA2010007_051_051-2021061508153.00 ppb
2021-06-22CA2010007_013_013-2021062209314.00 ppb
2021-06-22CA2010007_051_051-202106220835ND
2021-06-30CA2010007_013_013-2021063010004.00 ppb
2021-06-30CA2010007_051_051-2021063009007.00 ppb
2021-07-06CA2010007_013_013-2021070610454.00 ppb
2021-07-06CA2010007_051_051-2021070608352.00 ppb
2021-07-13CA2010007_051_051-2021071307132.00 ppb
2021-07-13CA2010007_013_013-2021071306476.00 ppb
2021-07-21CA2010007_013_013-2021072110504.00 ppb
2021-07-21CA2010007_051_051-2021072110502.00 ppb
2021-07-27CA2010007_013_013-2021072706533.00 ppb
2021-07-27CA2010007_051_051-2021072707583.00 ppb
2021-08-03CA2010007_013_013-2021080309084.00 ppb
2021-08-03CA2010007_050_050-20210803090829.0 ppb
2021-08-03CA2010007_027_027-20210803090824.0 ppb
2021-08-03CA2010007_051_051-2021080308082.00 ppb
2021-08-09CA2010007_051_051-2021080908083.00 ppb
2021-08-11CA2010007_013_013-2021081107084.00 ppb
2021-08-11CA2010007_048_048-2021081109087.00 ppb
2021-08-16CA2010007_001_001-2021081608085.00 ppb
2021-08-16CA2010007_009_009-20210816090815.0 ppb
2021-08-16CA2010007_024_024-2021081609085.00 ppb
2021-08-16CA2010007_046_046-2021081609086.00 ppb
2021-08-16CA2010007_047_047-2021081609086.00 ppb
2021-08-16CA2010007_010_010-20210816090833.0 ppb
2021-08-17CA2010007_013_013-20210817080812.0 ppb
2021-08-17CA2010007_051_051-2021081708084.00 ppb
2021-08-24CA2010007_013_013-2021082412085.00 ppb
2021-08-25CA2010007_051_051-2021082508083.00 ppb
2021-08-31CA2010007_013_013-2021083110085.00 ppb
2021-08-31CA2010007_051_051-2021083108084.00 ppb
2021-09-08CA2010007_013_013-2021090809094.00 ppb
2021-09-08CA2010007_051_051-2021090808093.00 ppb
2021-09-14CA2010007_013_013-2021091409093.00 ppb
2021-09-14CA2010007_051_051-202109140809ND
2021-09-22CA2010007_013_013-2021092208095.00 ppb
2021-09-22CA2010007_051_051-2021092208092.00 ppb
2021-09-28CA2010007_048_048-2021092809024.00 ppb
2021-09-28CA2010007_051_051-2021092807573.00 ppb
2021-09-28CA2010007_047_047-2021092808585.00 ppb
2021-09-28CA2010007_051_051-2021092807092.00 ppb
2021-09-28CA2010007_013_013-2021092810094.00 ppb
2021-09-28CA2010007_014_014-202109280800ND
2021-10-06CA2010007_051_051-2021100607355.00 ppb
2021-10-06CA2010007_013_013-2021100608205.00 ppb
2021-10-12CA2010007_013_013-2021101208104.00 ppb
2021-10-12CA2010007_051_051-2021101208405.00 ppb
2021-10-19CA2010007_051_051-2021101908366.00 ppb
2021-10-19CA2010007_013_013-2021101912534.00 ppb
2021-10-26CA2010007_013_013-2021102611074.00 ppb
2021-10-27CA2010007_051_051-2021102710335.00 ppb
2021-11-02CA2010007_027_027-20211102084628.0 ppb
2021-11-02CA2010007_051_051-2021110207524.00 ppb
2021-11-02CA2010007_013_013-2021110208504.00 ppb
2021-11-02CA2010007_050_050-20211102091031.0 ppb
2021-11-08CA2010007_051_051-2021110807488.00 ppb
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2023-09-19CA2010007_013_013-202309190910ND
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2023-10-17CA2010007_051_051-202310170845ND
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