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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

South Montebello Irrigation 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

 

156

Samples

1

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.81 ppb2421ND - 6.00 ppb
20152.35 ppb2413ND - 6.90 ppb
20162.52 ppb2516ND - 7.00 ppb
20172.05 ppb2510ND - 6.90 ppb
20182.76 ppb2517ND - 7.60 ppb
20194.55 ppb3330ND - 12.0 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
2014-01-073761-003-09252.60 ppb
2014-01-073761-005-09404.80 ppb
2014-02-043761-003-08402.20 ppb
2014-02-132706-003-10382.60 ppb
2014-02-132706-005-10573.80 ppb
2014-03-113761-003-09302.10 ppb
2014-04-083761-003-08402.60 ppb
2014-04-083761-005-08555.20 ppb
2014-05-073761-003-08502.20 ppb
2014-05-232706-003-0915ND
2014-05-232706-005-09306.00 ppb
2014-06-033761-003-0855ND
2014-07-083761-003-07402.30 ppb
2014-07-083761-005-08005.40 ppb
2014-08-053761-003-08402.10 ppb
2014-08-222706-003-09102.50 ppb
2014-08-222706-005-08504.10 ppb
2014-09-023761-003-10202.10 ppb
2014-10-083761-003-09252.30 ppb
2014-10-083761-005-09404.00 ppb
2014-11-252706-003-08502.30 ppb
2014-11-252706-005-09104.20 ppb
2014-12-023761-003-08302.10 ppb
2014-12-222706-007-0845ND
2015-01-063761-003-0750ND
2015-01-063761-005-08155.80 ppb
2015-02-033761-003-0850ND
2015-02-192706-003-11252.30 ppb
2015-02-192706-005-11105.10 ppb
2015-03-033761-003-0840ND
2015-04-143761-003-08202.20 ppb
2015-04-143761-005-08405.60 ppb
2015-05-053761-003-0830ND
2015-05-262706-003-09252.40 ppb
2015-05-262706-005-09406.20 ppb
2015-06-023761-003-0740ND
2015-07-073761-003-0850ND
2015-07-073761-005-09085.20 ppb
2015-08-043761-003-0838ND
2015-09-013761-003-0950ND
2015-09-242706-003-10102.10 ppb
2015-09-242706-005-10225.20 ppb
2015-10-063761-003-08452.30 ppb
2015-10-063761-005-09106.90 ppb
2015-11-033761-003-0919ND
2015-11-242706-003-0933ND
2015-12-013761-003-0859ND
2015-12-172706-005-09235.20 ppb
2016-01-053761-003-0857ND
2016-01-053761-005-08397.00 ppb
2016-02-023761-003-09132.80 ppb
2016-02-249588-003-10352.20 ppb
2016-02-249588-005-11406.00 ppb
2016-03-013761-003-09052.20 ppb
2016-04-123761-003-08402.40 ppb
2016-04-123761-005-08577.00 ppb
2016-05-103761-003-09082.30 ppb
2016-05-259588-003-09102.00 ppb
2016-05-259588-005-09254.80 ppb
2016-06-073761-003-07382.20 ppb
2016-07-123761-003-0902ND
2016-07-123761-005-09354.70 ppb
2016-08-023761-003-1013ND
2016-08-259588-003-1000ND
2016-08-259588-005-09354.20 ppb
2016-08-259588-009-1020ND
2016-09-063761-003-0834ND
2016-10-043761-003-0915ND
2016-10-043761-005-08554.90 ppb
2016-11-013761-003-0845ND
2016-11-229588-003-10202.00 ppb
2016-11-229588-005-10056.30 ppb
2016-12-063761-003-0904ND
2017-01-033761-003-0750ND
2017-01-173761-005-09356.70 ppb
2017-02-083761-003-0920ND
2017-02-219588-003-10152.20 ppb
2017-02-219588-005-10256.90 ppb
2017-03-073761-003-0912ND
2017-04-043761-003-0837ND
2017-04-043761-005-08555.70 ppb
2017-05-103761-003-0953ND
2017-05-259588-003-10202.10 ppb
2017-05-259588-005-10305.70 ppb
2017-06-133761-003-1020ND
2017-07-053761-003-0940ND
2017-07-113761-005-08594.90 ppb
2017-08-083761-003-0848ND
2017-08-309588-003-1050ND
2017-08-309588-005-11056.30 ppb
2017-08-309588-007-1035ND
2017-09-053761-003-0837ND
2017-10-033761-003-0955ND
2017-10-033761-005-09355.60 ppb
2017-10-139588-003-1120ND
2017-10-139588-005-11055.20 ppb
2017-11-073761-003-0905ND
2017-12-053761-003-0747ND
2018-01-023761-003-0847ND
2018-01-023761-005-09105.10 ppb
2018-02-063761-003-0930ND
2018-02-169588-003-10302.00 ppb
2018-02-169588-005-10455.40 ppb
2018-03-063761-003-0849ND
2018-04-033761-003-08312.00 ppb
2018-04-033761-005-08177.60 ppb
2018-05-013761-003-0943ND
2018-05-299588-003-10252.00 ppb
2018-05-299588-005-10405.90 ppb
2018-06-053761-003-0842ND
2018-06-053761-005-08204.60 ppb
2018-07-033761-003-0907ND
2018-07-033761-005-08435.50 ppb
2018-08-073761-003-10272.00 ppb
2018-08-159588-003-1100ND
2018-08-159588-005-10406.90 ppb
2018-09-043761-003-09582.10 ppb
2018-10-093761-003-09132.00 ppb
2018-10-093761-005-09445.90 ppb
2018-11-063761-003-09022.10 ppb
2018-11-149588-003-0940ND
2018-11-149588-005-09555.70 ppb
2018-12-043761-003-10072.10 ppb
2019-01-023761-003-09022.30 ppb
2019-01-083761-005-08479.30 ppb
2019-02-063761-003-08282.20 ppb
2019-02-219588-003-10152.30 ppb
2019-02-219588-005-103012.0 ppb
2019-03-053761-003-09422.50 ppb
2019-03-069588-005-083510.00 ppb
2019-04-023761-003-09512.30 ppb
2019-04-023761-005-09438.80 ppb
2019-04-093761-011-09103.90 ppb
2019-05-029588-003-08202.10 ppb
2019-05-029588-005-09157.30 ppb
2019-05-143761-003-09052.30 ppb
2019-05-143761-005-08057.30 ppb
2019-06-043761-003-10052.20 ppb
2019-06-043761-005-10188.50 ppb
2019-07-023761-003-09502.30 ppb
2019-07-023761-005-09228.30 ppb
2019-08-059588-003-1025ND
2019-08-059588-005-10006.20 ppb
2019-08-133761-003-09002.20 ppb
2019-08-133761-007-09107.30 ppb
2019-08-159588-009-1140ND
2019-09-043761-003-09172.10 ppb
2019-09-043761-005-09126.60 ppb
2019-10-083761-003-09222.20 ppb
2019-10-083761-005-09056.20 ppb
2019-11-053761-003-09172.00 ppb
2019-11-053761-005-08585.70 ppb
2019-11-089588-003-0855ND
2019-11-089588-005-09054.70 ppb
2019-12-123761-003-09102.10 ppb
2019-12-123761-005-08516.90 ppb