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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Old River Water Company

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.

 

438

Samples

54

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.19 ppb5710ND - 35.0 ppb
20153.81 ppb11316ND - 45.0 ppb
20164.66 ppb9617ND - 46.0 ppb
20173.14 ppb8012ND - 32.0 ppb
20183.22 ppb5113ND - 29.0 ppb
20191.57 ppb414ND - 27.0 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
2014-02-05251672ND
2014-02-05251673ND
2014-02-12EN2014-00000641-ND
2014-02-12EN2014-00000642-ND
2014-02-12EN2014-00000645-ND
2014-02-12EN2014-00000643-ND
2014-02-12EN2014-00000644-ND
2014-02-26EN2014-00000906-30.0 ppb
2014-02-26EN2014-00000905-27.0 ppb
2014-03-11EN2014-00001115ND
2014-03-11EN2014-00001117-ND
2014-03-11EN2014-00001118ND
2014-03-11EN2014-00001119ND
2014-03-11EN2014-00001120ND
2014-03-11EN2014-00001116ND
2014-03-11EN2014-00001114ND
2014-03-11EN2014-00001113-ND
2014-05-01EN2014-0000206129.0 ppb
2014-05-01EN2014-0000206226.0 ppb
2014-05-20EN2014-00002402ND
2014-06-11EN2014-000027773.00 ppb
2014-06-11EN2014-00002779ND
2014-06-11EN2014-00002780ND
2014-06-11EN2014-00002774ND
2014-06-11EN2014-00002775ND
2014-06-11EN2014-00002776ND
2014-06-11EN2014-00002778ND
2014-07-23EN2014-00003577ND
2014-07-23EN2014-00003576ND
2014-07-23EN2014-00003575ND
2014-07-23EN2014-00003578ND
2014-07-23EN2014-0000357435.0 ppb
2014-07-23EN2014-0000357926.0 ppb
2014-08-07EN2014-00003887ND
2014-08-07EN2014-00003888ND
2014-08-27EN2014-0000451911.0 ppb
2014-08-27EN2014-00004520ND
2014-09-03EN2014-00004635ND
2014-09-03EN2014-00004636ND
2014-09-24EN2014-00005146ND
2014-09-24EN2014-00005149ND
2014-09-24EN2014-00005148ND
2014-09-24EN2014-00005147ND
2014-10-09EN2014-0000549926.0 ppb
2014-10-09EN2014-0000549826.0 ppb
2014-10-21EN2014-00005772ND
2014-10-21EN2014-00005775ND
2014-10-21EN2014-00005773ND
2014-10-21EN2014-00005774ND
2014-11-05EN2014-00006113ND
2014-11-05EN2014-00006112ND
2014-11-20EN2014-00006458ND
2014-11-20EN2014-00006459ND
2014-11-21EN2014-00006460ND
2014-12-16EN2014-00006867ND
2014-12-17EN2014-00006868ND
2014-12-22EN2014-00006961ND
2015-01-07EN2015-0000013345.0 ppb
2015-01-07EN2015-0000013427.0 ppb
2015-01-07EN2015-00000135ND
2015-01-08EN2015-00000137ND
2015-01-08EN2015-00000136ND
2015-01-30EN2015-000006386.00 ppb
2015-02-21EN2015-00000954ND
2015-02-21EN2015-00000955ND
2015-02-26EN2015-0000095233.0 ppb
2015-02-26EN2015-0000095327.0 ppb
2015-03-26EN2015-00001629ND
2015-04-13EN2015-00002093ND
2015-04-30EN2015-00002094ND
2015-05-06EN2015-0000209126.0 ppb
2015-05-06EN2015-0000209244.0 ppb
2015-05-12EN2015-00002407ND
2015-05-12EN2015-00002408ND
2015-05-12EN2015-00002409ND
2015-05-26EN2015-00002609ND
2015-05-27EN2015-00002608ND
2015-05-29EN2015-00002607ND
2015-06-09EN2015-00002875ND
2015-06-15EN2015-00002874ND
2015-06-17EN2015-0000287342.0 ppb
2015-06-17EN2015-0000287628.0 ppb
2015-07-06EN2015-00003338ND
2015-07-06EN2015-0000333912.0 ppb
2015-07-06EN2015-00003342ND
2015-07-06EN2015-0000334323.0 ppb
2015-07-06EN2015-00003341ND
2015-07-06EN2015-00003313ND
2015-07-06EN2015-00003344ND
2015-07-06EN2015-00003340ND
2015-07-06EN2015-00003315ND
2015-07-06EN2015-00003345ND
2015-07-06EN2015-00003326ND
2015-07-06EN2015-00003346ND
2015-07-06EN2015-00003347ND
2015-07-07EN2015-00003324ND
2015-07-07EN2015-00003325ND
2015-07-07EN2015-00003311ND
2015-07-07EN2015-00003323ND
2015-07-07EN2015-00003320ND
2015-07-07EN2015-00003331ND
2015-07-07EN2015-00003332ND
2015-07-07EN2015-00003337ND
2015-07-07EN2015-00003321ND
2015-07-07EN2015-00003327ND
2015-07-07EN2015-00003318ND
2015-07-07EN2015-00003319ND
2015-07-07EN2015-00003312ND
2015-07-07EN2015-00003310ND
2015-07-07EN2015-00003316ND
2015-07-07EN2015-00003333ND
2015-07-07EN2015-00003317ND
2015-07-08EN2015-00003330ND
2015-07-08EN2015-00003334ND
2015-07-09EN2015-00003322ND
2015-07-09EN2015-00003336ND
2015-07-09EN2015-00003328ND
2015-07-09EN2015-00003329ND
2015-07-09EN2015-00003335ND
2015-07-09EN2015-00003314ND
2015-07-12EN2015-000035045.00 ppb
2015-07-15EN2015-00003506ND
2015-07-15EN2015-00003507ND
2015-07-15EN2015-00003509ND
2015-07-15EN2015-00003511ND
2015-07-16EN2015-00003510ND
2015-07-16EN2015-00003505ND
2015-07-17EN2015-00003508ND
2015-07-24EN2015-00003707ND
2015-07-24EN2015-00003705ND
2015-07-29EN2015-00003706ND
2015-07-30EN2015-0000370829.0 ppb
2015-07-30EN2015-0000370927.0 ppb
2015-08-01EN2015-00003876ND
2015-08-04EN2015-00003875ND
2015-08-05EN2015-00003874ND
2015-08-06EN2015-00004090ND
2015-08-06EN2015-00004089ND
2015-08-07EN2015-00004096ND
2015-08-08EN2015-00004092ND
2015-08-10EN2015-00004093ND
2015-08-11EN2015-00004095ND
2015-08-11EN2015-00004094ND
2015-08-14EN2015-00004091ND
2015-08-26EN2015-00004376ND
2015-08-26EN2015-00004377ND
2015-08-28EB2015-00004378AND
2015-09-02EN2015-00004490ND
2015-09-09EN2015-00004667ND
2015-09-09EN2015-00004668ND
2015-09-24EN2015-00004905ND
2015-09-24EN2015-00004904ND
2015-10-07EN2015-00005108ND
2015-10-14EN2015-00005328ND
2015-10-14EN2015-00005329ND
2015-10-19EN2015-00005327ND
2015-10-19EN2015-0000532530.0 ppb
2015-10-19EN2015-0000532627.0 ppb
2015-10-22EN2015-00005658ND
2015-10-23EN2015-00005659ND
2015-11-10EN2015-00005793ND
2015-11-13EN2015-00005794ND
2015-11-14EN2015-00005978ND
2015-11-18EN2015-00005979ND
2015-12-03EN2015-00006141ND
2015-12-03EN2015-00006140ND
2015-12-28EN2015-00006584ND
2015-12-28EN2015-00006583ND
2015-12-30EN2015-00006585ND
2015-12-31EN2016-00000060ND
2016-01-06EN2016-0000005846.0 ppb
2016-01-06EN2016-0000005927.0 ppb
2016-01-20EN2016-00000366ND
2016-01-20EN2016-00000365ND
2016-01-21EN2016-00000367ND
2016-01-27EN2016-00000364ND
2016-01-29EN2016-00000490ND
2016-01-29EN2016-00000492ND
2016-02-03EN2016-00000491ND
2016-02-08EN2016-00000706ND
2016-02-08EN2016-00000707ND
2016-03-03EN2016-00000882ND
2016-03-03EN2016-00000883ND
2016-03-14EN2016-0000105230.0 ppb
2016-03-14EN2016-0000105328.0 ppb
2016-03-18EN2016-00001125ND
2016-03-18EN2016-0001125ND
2016-03-18EN2016-0000112428.0 ppb
2016-03-22EN2016-00001175ND
2016-03-31EN2016-00001327ND
2016-04-06EN2016-00001485ND
2016-04-06EN2016-00001486ND
2016-04-07EN2016-00001502ND
2016-04-21EN2016-00001756ND
2016-04-22EN2016-00001776ND
2016-04-23EN2016-00001774ND
2016-04-25EN2016-00001775ND
2016-04-25EN2016-00001777ND
2016-04-25EN2016-00001773ND
2016-04-26EN2016-00001880ND
2016-04-26EN2016-00001883ND
2016-04-26EN2016-00001882ND
2016-04-26EN2016-00001881ND
2016-04-26EN2016-00001879ND
2016-04-30EN2016-00001884ND
2016-05-02EN2016-0000188535.0 ppb
2016-05-02EN2016-0000188628.0 ppb
2016-05-03EN2016-00001951ND
2016-05-03EN2016-000019505.00 ppb
2016-05-03EN2016-000019524.00 ppb
2016-05-09EN2016-00002275ND
2016-05-11EN2016-00002274ND
2016-05-17EN2016-00002276ND
2016-05-17EN2016-00002277ND
2016-05-18EN2016-00002278ND
2016-05-27EN2016-00002449ND
2016-06-14EN2016-00002761ND
2016-06-14EN2016-00002763ND
2016-06-14EN2016-00002762ND
2016-06-14EN2016-00002760ND
2016-06-17EN2016-00003031ND
2016-06-17EN2016-00003029ND
2016-06-24EN2016-00003030ND
2016-06-30EN2016-00003343ND
2016-07-05EN2016-00003948ND
2016-07-05EN2016-00003949ND
2016-07-06EN2016-00003342ND
2016-07-11EN2016-0000334534.0 ppb
2016-07-11EN2016-0000334628.0 ppb
2016-07-21EN2016-00003950ND
2016-08-03EN2016-00003951ND
2016-08-08EN2016-00003952ND
2016-08-22EN2016-00004251ND
2016-08-22EN2016-00004254ND
2016-08-22EN2016-0000425228.0 ppb
2016-08-22EN2016-0000425030.0 ppb
2016-08-23EN2016-00004253ND
2016-08-24EN2016-00004330ND
2016-08-24EN2016-00004331ND
2016-08-24EN2016-00004332ND
2016-09-02EN2016-00004587ND
2016-09-06EN2016-00004588ND
2016-09-08EN2016-00004851ND
2016-09-10EN2016-00004849ND
2016-09-12EN2016-0000469429.0 ppb
2016-09-16EN2016-00004850ND
2016-09-22EN2016-00005243ND
2016-09-22EN2016-00005241ND
2016-09-29EN2016-00005244ND
2016-09-30EN2016-00005245ND
2016-10-05EN2016-0000524229.0 ppb
2016-10-05EN2016-0000524028.0 ppb
2016-10-18EN2016-00005643ND
2016-10-20EN2016-00005642ND
2016-10-27EN2016-00005768ND
2016-10-27EN2016-00005766ND
2016-10-27EN2016-00005767ND
2016-11-07EN2016-00005978ND
2016-11-07EN2016-00005979ND
2016-11-07EN2016-00005977ND
2016-11-09EN2016-00005976ND
2016-11-30EN2016-00006336ND
2016-11-30EN2016-00006335ND
2016-12-01EN2016-0000633410.00 ppb
2016-12-05EN2016-00006333ND
2016-12-22EN2017-00000111ND
2017-01-04EN2017-0000011022.0 ppb
2017-01-10EN2017-00000442ND
2017-01-15EN2017-00000443ND
2017-02-01EN2017-0000044132.0 ppb
2017-02-08EN2017-00000793ND
2017-02-10EN2017-00000792ND
2017-02-15EN2017-00000791ND
2017-02-27EN2017-00001120ND
2017-03-05EN2017-00001117ND
2017-03-09EN2017-00001118ND
2017-03-11EN2017-00001119ND
2017-03-13EN2017-00001121ND
2017-03-18EN2017-00001823ND
2017-04-13EN2017-00002795ND
2017-05-01EN2017-00002792ND
2017-05-01EN2017-0000279329.0 ppb
2017-05-01EN2017-0000279427.0 ppb
2017-05-04EN2017-00003491ND
2017-05-08EN2017-00003494ND
2017-05-16EN2017-00003489ND
2017-05-23EN2017-00003492ND
2017-06-02EN2017-00003493ND
2017-06-21EN2017-00004252ND
2017-06-22EN2017-000042533.00 ppb
2017-07-05EN2017-00004254ND
2017-07-11EN2017-00004255ND
2017-07-12EN2017-0000425628.0 ppb
2017-07-12EN2017-0000425725.0 ppb
2017-07-13EN2017-00004546ND
2017-07-14EN2017-00004547ND
2017-07-17EN2017-00004548ND
2017-07-21EN2017-00004549ND
2017-07-26EN2017-00004550ND
2017-08-03EN2017-00004932ND
2017-08-07EN2017-00004931ND
2017-08-15EN2017-0000517524.0 ppb
2017-08-29EN2017-00005269ND
2017-08-29EN2017-00005270ND
2017-08-29EN2017-00005267ND
2017-08-29EN2017-00005265ND
2017-08-29EN2017-00005266ND
2017-08-29EN2017-00005268ND
2017-08-31EN2017-00005337ND
2017-09-02EN2017-00005338ND
2017-09-06EN2017-00005339ND
2017-09-09EN2017-00005717ND
2017-09-09EN2017-00005718ND
2017-09-13EN2017-00005719ND
2017-09-15EN2017-00005722ND
2017-09-16EN2017-00005721ND
2017-09-16EN2017-00005720ND
2017-09-19EN2017-00005723ND
2017-09-30EN2017-00005994ND
2017-09-30EN2017-000059953.00 ppb
2017-10-04EN2017-00005996ND
2017-10-10EN2017-00006485ND
2017-10-24EN2017-00006484ND
2017-10-24EN2017-00006487ND
2017-10-25EN2017-00006489ND
2017-10-27EN2017-00006486ND
2017-10-31EN2017-00006488ND
2017-11-02EN2017-00006483ND
2017-11-08EN2017-00006615ND
2017-11-13EN2017-000066144.00 ppb
2017-11-13EN2017-0000661228.0 ppb
2017-11-13EN2017-0000661326.0 ppb
2017-11-14EN2017-00007004ND
2017-11-14EN2017-00007005ND
2017-11-17EN2017-00007006ND
2017-11-30EN2017-00007003ND
2017-12-11EN2017-00007422ND
2017-12-11EN2017-00007426ND
2017-12-11EN2017-00007425ND
2017-12-13EN2017-00007427ND
2017-12-13EN2017-00007421ND
2017-12-13EN2017-00007424ND
2017-12-14EN2017-00007423ND
2017-12-14EN2017-00007420ND
2017-12-19EN2017-00007522ND
2017-12-19EN2017-00007523ND
2018-01-06EN2018-00000293ND
2018-01-07EN2018-000002963.00 ppb
2018-01-08EN2018-00000294ND
2018-01-08EN2018-00000297ND
2018-01-08EN2018-00000298ND
2018-01-09EN2018-00000295ND
2018-01-17EN2018-00000812ND
2018-01-23EN2018-00000811ND
2018-01-24EN2018-00000810ND
2018-01-31EN2018-00000808ND
2018-01-31EN2018-00000809ND
2018-02-06EN2018-000008076.00 ppb
2018-02-10EN2018-00000943ND
2018-02-27EN2018-00001182ND
2018-02-27EN2018-00001183ND
2018-03-24EN2018-00001627ND
2018-03-27EN2018-00001629ND
2018-03-27EN2018-00001630ND
2018-03-29EN2018-00001628ND
2018-04-04EN2018-0000162626.0 ppb
2018-04-06EN2018-00001770ND
2018-04-11EN2018-0000177129.0 ppb
2018-04-11EN2018-000017725.00 ppb
2018-04-11EN2018-0000177329.0 ppb
2018-06-261806829-001ND
2018-09-2518090928-00125.0 ppb
2018-09-2518090928-002ND
2018-09-2518090928-003ND
2018-09-2618090928-004ND
2018-09-2718090928-005ND
2018-12-1418120466-001ND
2018-12-1418120466-002ND
2018-12-1418120466-003ND
2018-12-1418120466-004ND
2018-12-1418120466-005ND
2018-12-1418120466-006ND
2018-12-1418120466-007ND
2018-12-1418120466-008ND
2018-12-1418120466-0091.30 ppb
2018-12-1418120466-010ND
2018-12-1418120466-0114.00 ppb
2018-12-1418120466-012ND
2018-12-1418120466-013ND
2018-12-1818120562-0041.000 ppb
2018-12-2019010318-001ND
2018-12-2718120749-00125.0 ppb
2018-12-2718120749-002ND
2018-12-2718120749-003ND
2018-12-2718120749-004ND
2018-12-2718120749-0056.00 ppb
2018-12-2818120761-0013.90 ppb
2019-01-0519010318-00211.0 ppb
2019-03-0519030112-001ND
2019-03-0519030112-002ND
2019-03-0519030112-003ND
2019-03-0519030112-004ND
2019-03-0619030226-001ND
2019-03-0619030226-002ND
2019-03-0619030226-003ND
2019-03-0619030226-004ND
2019-03-0619030226-0056.50 ppb
2019-03-2119030638-001ND
2019-07-2519071029-004ND
2019-08-0119080044-001ND
2019-08-1519080614-00420.0 ppb
2019-10-2019100682-001ND
2019-10-2019100682-002ND
2019-10-2019100682-003ND
2019-11-1519110502-00127.0 ppb
2019-11-2919120243-001ND
2019-12-1919120686-001ND
2019-12-1919120686-002ND
2019-12-1919120686-003ND
2019-12-1919120686-004ND
2019-12-2119120749-001ND
2019-12-2119120749-002ND
2019-12-2119120749-003ND
2019-12-2119120749-004ND
2019-12-2119120749-005ND
2019-12-2119120749-006ND
2019-12-2119120749-007ND
2019-12-2719120849-002ND
2019-12-2719120849-004ND
2019-12-2719120851-001ND
2019-12-2719120851-002ND
2019-12-2819120851-006ND
2019-12-2819120851-007ND
2019-12-3019120851-003ND
2019-12-3019120851-005ND
2019-12-3119120849-001ND
2019-12-3119120849-003ND
2019-12-3119120851-004ND