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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Monterey Park Water Department

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

 

490

Samples

0

Samples exceeding legal limit (MCL)

205

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.746 ppb5819ND - 5.40 ppb
20151.66 ppb6430ND - 4.90 ppb
20160.610 ppb6916ND - 4.70 ppb
20171.01 ppb9235ND - 4.00 ppb
20181.91 ppb10153ND - 6.60 ppb
20191.86 ppb10652ND - 5.60 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
2014-01-073761-068-1030ND
2014-01-143761-068-08452.50 ppb
2014-01-153761-068-07002.70 ppb
2014-01-213761-068-0825ND
2014-01-283761-068-0715ND
2014-02-033761-068-07402.10 ppb
2014-02-033761-068-12352.10 ppb
2014-02-113761-068-0845ND
2014-02-183761-068-0840ND
2014-02-253761-068-0715ND
2014-03-043761-068-0915ND
2014-03-043761-068-0920ND
2014-03-113761-068-0910ND
2014-03-183761-068-0845ND
2014-03-253761-068-0830ND
2014-04-013761-068-00005.40 ppb
2014-04-083761-068-0920ND
2014-04-083761-068-14252.20 ppb
2014-04-153761-068-07152.60 ppb
2014-04-223761-068-09202.80 ppb
2014-04-293761-068-07552.90 ppb
2014-05-063761-068-10402.20 ppb
2014-05-063761-068-13302.10 ppb
2014-05-133761-068-09452.50 ppb
2014-05-203761-068-0850ND
2014-05-283761-068-1115ND
2014-06-023761-068-08152.90 ppb
2014-06-033761-068-1015ND
2014-06-113761-068-0850ND
2014-06-163761-068-0915ND
2014-06-243761-068-08352.40 ppb
2014-07-013761-068-0815ND
2014-07-083761-068-09152.20 ppb
2014-07-083761-068-1055ND
2014-07-153761-068-0920ND
2014-07-223761-068-0833ND
2014-07-293761-068-11351.10 ppb
2014-08-053761-068-0724ND
2014-08-053761-068-0800ND
2014-08-123761-068-09500.710 ppb
2014-08-193761-068-0902ND
2014-08-263761-068-1110ND
2014-09-023761-068-0900ND
2014-09-033761-068-0910ND
2014-09-093761-068-1105ND
2014-09-163761-068-0813ND
2014-09-233761-068-1155ND
2014-09-293761-068-0905ND
2014-10-083761-068-0900ND
2014-10-143761-068-0800ND
2014-10-223761-068-0940ND
2014-11-253761-068-0832ND
2014-12-033761-068-0000ND
2014-12-033761-068-11450.880 ppb
2014-12-093761-068-1036ND
2014-12-153761-068-1120ND
2014-12-233761-068-0900ND
2014-12-303761-068-08400.970 ppb
2015-01-063761-068-0923ND
2015-01-133761-068-1135ND
2015-01-133761-068-1240ND
2015-01-203761-068-1030ND
2015-01-273761-068-1030ND
2015-02-033761-068-09452.80 ppb
2015-02-033761-068-09472.80 ppb
2015-02-103761-068-09102.10 ppb
2015-02-163761-068-11053.50 ppb
2015-02-243761-068-09053.00 ppb
2015-03-033761-068-09553.80 ppb
2015-03-103761-068-09152.80 ppb
2015-03-173761-068-09002.90 ppb
2015-03-243761-068-0905ND
2015-03-243761-068-0950ND
2015-03-313761-068-1049ND
2015-04-063761-068-0815ND
2015-04-073761-068-11552.30 ppb
2015-04-153761-068-09104.60 ppb
2015-04-213761-068-08002.50 ppb
2015-04-283761-068-10354.80 ppb
2015-05-043761-068-08103.70 ppb
2015-05-043761-068-12004.00 ppb
2015-05-113761-068-09204.00 ppb
2015-05-193761-068-08453.30 ppb
2015-05-263761-068-09364.80 ppb
2015-06-023761-068-15304.90 ppb
2015-06-033761-068-09303.80 ppb
2015-06-093761-068-08454.00 ppb
2015-06-163761-068-08053.90 ppb
2015-06-233761-068-08404.00 ppb
2015-06-303761-068-10504.00 ppb
2015-07-073761-068-10053.30 ppb
2015-07-073761-068-10283.30 ppb
2015-07-143761-068-09504.10 ppb
2015-07-213761-068-09373.50 ppb
2015-07-283761-068-09103.30 ppb
2015-08-033761-068-10423.30 ppb
2015-08-033761-068-10453.10 ppb
2015-08-113761-068-0945ND
2015-08-173761-068-0000ND
2015-08-253761-068-0840ND
2015-09-013761-068-1000ND
2015-09-013761-068-1100ND
2015-09-083761-068-0935ND
2015-09-163761-068-0856ND
2015-09-223761-068-0850ND
2015-09-293761-068-0955ND
2015-10-063761-068-1230ND
2015-10-073761-068-1210ND
2015-10-133761-068-0920ND
2015-10-203761-068-0840ND
2015-10-273761-068-0950ND
2015-11-023761-068-1010ND
2015-11-023761-068-1100ND
2015-11-103761-068-0900ND
2015-11-163761-068-0905ND
2015-11-233761-068-1230ND
2015-12-023761-068-1005ND
2015-12-023761-068-1440ND
2015-12-083761-068-0923ND
2015-12-153761-068-0850ND
2015-12-213761-068-0845ND
2015-12-283761-068-1035ND
2016-01-043761-068-1020ND
2016-01-043761-068-1150ND
2016-01-123761-068-0920ND
2016-01-193761-068-1000ND
2016-01-263761-068-09152.80 ppb
2016-02-023761-068-1310ND
2016-02-023761-068-1315ND
2016-02-093761-068-0930ND
2016-02-163761-068-0930ND
2016-02-223761-068-0920ND
2016-03-013761-068-0810ND
2016-03-023761-068-08124.70 ppb
2016-03-083761-068-0000ND
2016-03-153761-068-1020ND
2016-03-223761-068-0930ND
2016-03-293761-068-0913ND
2016-04-059590-068-1040ND
2016-04-069590-068-08502.00 ppb
2016-04-129590-068-1207ND
2016-04-129590-068-1210ND
2016-04-199590-068-0935ND
2016-04-199590-068-1155ND
2016-04-259590-068-0940ND
2016-04-259590-068-0945ND
2016-05-039590-068-10002.00 ppb
2016-05-039590-068-10302.00 ppb
2016-05-109590-068-1000ND
2016-05-109590-068-1005ND
2016-05-169590-068-1040ND
2016-05-169590-068-1230ND
2016-05-249590-068-0905ND
2016-05-249590-068-0908ND
2016-05-319590-068-1010ND
2016-07-059590-068-1130ND
2016-07-069590-068-1045ND
2016-07-119590-068-0930ND
2016-07-119590-068-1050ND
2016-07-199590-068-1035ND
2016-07-199590-068-1040ND
2016-07-269590-068-0855ND
2016-07-269590-068-1025ND
2016-08-019590-068-0840ND
2016-08-029590-068-0915ND
2016-08-099590-068-10302.60 ppb
2016-08-099590-068-11102.50 ppb
2016-08-169590-068-0940ND
2016-08-169590-068-0945ND
2016-08-239590-068-1020ND
2016-08-239590-068-1055ND
2016-10-049590-068-13003.40 ppb
2016-10-059590-068-10302.70 ppb
2016-10-109590-068-10452.90 ppb
2016-10-119590-068-08154.10 ppb
2016-10-189590-068-1025ND
2016-10-189590-068-1220ND
2016-10-259590-068-0825ND
2016-10-259590-068-0920ND
2016-11-019590-068-07402.00 ppb
2016-11-019590-068-11552.20 ppb
2016-11-099590-068-1100ND
2016-11-099590-068-1105ND
2016-11-159590-068-09402.20 ppb
2016-11-159590-068-0950ND
2016-11-229590-068-08412.00 ppb
2016-11-229590-068-08502.00 ppb
2016-12-209590-068-0945ND
2016-12-209590-068-0947ND
2016-12-289590-068-0950ND
2016-12-289590-068-0955ND
2017-01-039590-068-0825ND
2017-01-039590-068-0945ND
2017-01-109590-068-07552.20 ppb
2017-01-109590-068-10502.50 ppb
2017-01-189590-068-09552.10 ppb
2017-01-189590-068-10352.00 ppb
2017-01-249590-068-1045ND
2017-01-319590-068-1005ND
2017-01-319590-068-1010ND
2017-02-079590-068-1140ND
2017-02-089590-068-09202.60 ppb
2017-02-149590-068-09153.00 ppb
2017-02-149590-068-10053.10 ppb
2017-02-229590-068-0910ND
2017-02-229590-068-0920ND
2017-02-279590-068-1100ND
2017-02-279590-068-1110ND
2017-03-079590-068-0715ND
2017-03-079590-068-11302.40 ppb
2017-03-149590-068-0950ND
2017-03-149590-068-0955ND
2017-03-209590-068-0920ND
2017-03-209590-068-0936ND
2017-03-289590-068-1120ND
2017-03-289590-068-1122ND
2017-04-039590-068-1110ND
2017-04-049590-068-11502.80 ppb
2017-04-119590-068-1055ND
2017-04-119590-068-1245ND
2017-04-189590-068-0930ND
2017-04-189590-068-1000ND
2017-04-259590-068-1100ND
2017-04-259590-068-1105ND
2017-05-019590-068-10302.20 ppb
2017-05-089590-068-1030ND
2017-05-089590-068-1145ND
2017-05-169590-068-0820ND
2017-05-169590-068-1000ND
2017-05-229590-068-0925ND
2017-05-229590-068-1115ND
2017-05-309590-068-1010ND
2017-07-039590-068-09593.40 ppb
2017-07-039590-068-10053.50 ppb
2017-07-119590-068-09302.40 ppb
2017-07-119590-068-09402.30 ppb
2017-07-189590-068-09052.70 ppb
2017-07-259590-068-09562.60 ppb
2017-07-259590-068-10002.00 ppb
2017-08-029590-068-0900ND
2017-08-029590-068-1115ND
2017-08-079590-068-1058ND
2017-08-089590-068-08513.90 ppb
2017-08-159590-068-1020ND
2017-08-159590-068-1200ND
2017-08-229590-068-0805ND
2017-08-229590-068-0810ND
2017-08-299590-068-09253.20 ppb
2017-08-299590-068-10303.40 ppb
2017-09-059590-068-09582.00 ppb
2017-09-059590-068-10012.10 ppb
2017-09-129590-068-09102.60 ppb
2017-09-129590-068-09452.70 ppb
2017-09-209590-068-0912ND
2017-09-209590-068-0915ND
2017-09-269590-068-10003.40 ppb
2017-09-269590-068-10403.40 ppb
2017-10-029590-068-10502.70 ppb
2017-10-029590-068-10552.70 ppb
2017-10-109590-068-09102.20 ppb
2017-10-109590-068-09302.20 ppb
2017-10-179590-068-1000ND
2017-10-179590-068-1040ND
2017-10-249590-068-0830ND
2017-10-249590-068-0935ND
2017-10-319590-068-09002.20 ppb
2017-10-319590-068-09022.10 ppb
2017-11-079590-068-1120ND
2017-11-089590-068-10104.00 ppb
2017-11-149590-068-1025ND
2017-11-149590-068-1030ND
2017-11-219590-068-09052.00 ppb
2017-11-219590-068-09502.00 ppb
2017-11-299590-068-0943ND
2017-11-299590-068-0945ND
2017-12-049590-068-1020ND
2017-12-059590-068-1130ND
2017-12-119590-068-0927ND
2017-12-119590-068-0930ND
2017-12-199590-068-0945ND
2017-12-199590-068-1050ND
2017-12-279590-068-1000ND
2017-12-279590-068-1007ND
2018-01-029590-068-09176.60 ppb
2018-01-089590-068-11006.60 ppb
2018-01-179590-068-10456.00 ppb
2018-01-189590-068-0816ND
2018-01-239590-068-0851ND
2018-01-239590-068-0854ND
2018-01-309590-068-08005.90 ppb
2018-01-319590-068-1350ND
2018-02-069590-068-09202.80 ppb
2018-02-079590-068-0900ND
2018-02-139590-068-10052.00 ppb
2018-02-139590-068-10592.20 ppb
2018-02-209590-068-0855ND
2018-02-209590-068-0935ND
2018-02-279590-068-09003.10 ppb
2018-02-279590-068-1120ND
2018-03-069590-068-0734ND
2018-03-079590-068-08452.70 ppb
2018-03-149590-068-1030ND
2018-03-149590-068-1040ND
2018-03-209590-068-0910ND
2018-03-209590-068-1005ND
2018-03-279590-068-0945ND
2018-03-279590-068-1030ND
2018-04-039590-068-0840ND
2018-04-039590-068-0850ND
2018-04-119590-068-0930ND
2018-04-119590-068-1020ND
2018-04-179590-068-0924ND
2018-04-179590-068-0928ND
2018-04-249590-068-1150ND
2018-04-249590-068-1340ND
2018-05-029590-068-09302.70 ppb
2018-05-029590-068-10002.60 ppb
2018-05-089590-068-0955ND
2018-05-089590-068-1035ND
2018-05-159590-068-08252.10 ppb
2018-05-159590-068-09002.00 ppb
2018-05-219590-068-1025ND
2018-05-229590-068-1020ND
2018-05-309590-068-09182.10 ppb
2018-05-309590-068-09202.10 ppb
2018-06-059590-068-10453.70 ppb
2018-06-069590-068-0855ND
2018-06-129590-068-0900ND
2018-06-129590-068-0945ND
2018-06-199590-068-1220ND
2018-06-199590-068-1230ND
2018-06-269590-068-1000ND
2018-06-269590-068-1004ND
2018-07-029590-068-1220ND
2018-07-039590-068-12302.10 ppb
2018-07-099590-068-10072.20 ppb
2018-07-099590-068-10132.30 ppb
2018-07-179590-068-1030ND
2018-07-179590-068-1056ND
2018-07-249590-068-08302.10 ppb
2018-07-249590-068-0920ND
2018-08-019590-068-1120ND
2018-08-019590-068-1140ND
2018-08-079590-068-08202.80 ppb
2018-08-079590-068-08562.70 ppb
2018-08-149590-068-10503.00 ppb
2018-08-149590-068-10553.00 ppb
2018-08-219590-068-0904ND
2018-08-219590-068-0906ND
2018-08-289590-068-1015ND
2018-08-289590-068-1200ND
2018-09-059590-068-0939ND
2018-09-059590-068-09402.00 ppb
2018-09-109590-068-09202.30 ppb
2018-09-119590-068-09205.60 ppb
2018-09-199590-068-09104.60 ppb
2018-09-219590-068-16352.50 ppb
2018-09-259590-068-0930ND
2018-09-259590-068-10503.00 ppb
2018-10-029590-068-09252.60 ppb
2018-10-029590-068-09302.70 ppb
2018-10-099590-068-0925ND
2018-10-099590-068-1005ND
2018-10-169590-068-09004.40 ppb
2018-10-239590-068-10454.20 ppb
2018-10-249590-068-09056.40 ppb
2018-10-299590-068-10134.90 ppb
2018-10-309590-068-08544.60 ppb
2018-11-079590-068-08504.50 ppb
2018-11-079590-068-12504.70 ppb
2018-11-149590-068-10584.20 ppb
2018-11-149590-068-11004.20 ppb
2018-11-199590-068-09554.40 ppb
2018-11-199590-068-10404.50 ppb
2018-11-269590-068-09174.10 ppb
2018-11-269590-068-10163.90 ppb
2018-12-049590-068-10164.60 ppb
2018-12-049590-068-11505.20 ppb
2018-12-109590-068-09204.40 ppb
2018-12-109590-068-10224.20 ppb
2018-12-189590-068-08594.00 ppb
2018-12-189590-068-09103.90 ppb
2018-12-269590-068-09443.60 ppb
2018-12-269590-068-11053.80 ppb
2019-01-029590-068-12204.40 ppb
2019-01-039590-068-09154.20 ppb
2019-01-089590-068-09414.60 ppb
2019-01-099590-068-09155.00 ppb
2019-01-159590-068-08154.50 ppb
2019-01-159590-068-09054.90 ppb
2019-01-239590-068-08154.30 ppb
2019-01-239590-068-09454.80 ppb
2019-01-299590-068-10304.10 ppb
2019-01-299590-068-12054.20 ppb
2019-02-049590-068-09204.40 ppb
2019-02-069590-068-08364.20 ppb
2019-02-129590-068-08515.60 ppb
2019-02-129590-068-12555.60 ppb
2019-02-209590-068-09004.10 ppb
2019-02-209590-068-09304.20 ppb
2019-02-269590-068-11064.40 ppb
2019-02-279590-068-09104.40 ppb
2019-03-059590-068-10254.60 ppb
2019-03-059590-068-10455.00 ppb
2019-03-129590-068-09104.50 ppb
2019-03-129590-068-10054.80 ppb
2019-03-199590-068-08344.20 ppb
2019-03-199590-068-09404.40 ppb
2019-03-269590-068-11154.60 ppb
2019-03-269590-068-13005.00 ppb
2019-04-029590-068-10454.70 ppb
2019-04-039590-068-09155.30 ppb
2019-04-099590-068-09255.40 ppb
2019-04-099590-068-10155.20 ppb
2019-04-169590-068-10012.00 ppb
2019-04-169590-068-1010ND
2019-04-239590-068-0840ND
2019-04-239590-068-1050ND
2019-04-299590-068-1145ND
2019-04-299590-068-1205ND
2019-05-089590-068-09502.60 ppb
2019-05-089590-068-1100ND
2019-05-149590-068-0857ND
2019-05-149590-068-0935ND
2019-05-219590-068-0830ND
2019-05-219590-068-1120ND
2019-05-289590-068-08202.10 ppb
2019-05-289590-068-08222.00 ppb
2019-06-049590-068-0815ND
2019-06-059590-068-09452.70 ppb
2019-06-119590-068-0830ND
2019-06-119590-068-0857ND
2019-06-189590-068-0930ND
2019-06-189590-068-1110ND
2019-06-259590-068-1001ND
2019-06-259590-068-1040ND
2019-07-029590-068-08482.50 ppb
2019-07-029590-068-10202.90 ppb
2019-07-089590-068-1008ND
2019-07-089590-068-1012ND
2019-07-169590-068-0857ND
2019-07-179590-068-10302.20 ppb
2019-07-239590-068-0904ND
2019-07-239590-068-0910ND
2019-07-309590-068-0850ND
2019-07-309590-068-0945ND
2019-08-059590-068-1210ND
2019-08-069590-068-09252.10 ppb
2019-08-139590-068-0940ND
2019-08-139590-068-1050ND
2019-08-209590-068-0938ND
2019-08-209590-068-0940ND
2019-08-279590-068-09402.50 ppb
2019-08-279590-068-10302.40 ppb
2019-09-049590-068-08503.20 ppb
2019-09-049590-068-11113.20 ppb
2019-09-109590-068-0900ND
2019-09-109590-068-1036ND
2019-09-179590-068-0945ND
2019-09-179590-068-0949ND
2019-09-259590-068-0900ND
2019-09-259590-068-1020ND
2019-10-019590-068-1015ND
2019-10-029590-068-09302.50 ppb
2019-10-089590-068-1030ND
2019-10-089590-068-1040ND
2019-10-159590-068-0942ND
2019-10-159590-068-0945ND
2019-10-239590-068-0945ND
2019-10-239590-068-1035ND
2019-10-299590-068-0947ND
2019-10-299590-068-1000ND
2019-11-069590-068-1020ND
2019-11-069590-068-1156ND
2019-11-129590-068-1000ND
2019-11-129590-068-1005ND
2019-11-199590-068-0940ND
2019-11-199590-068-1015ND
2019-11-269590-068-09383.90 ppb
2019-11-269590-068-09413.90 ppb
2019-12-039590-068-10204.10 ppb
2019-12-039590-068-11452.10 ppb
2019-12-109590-068-10552.10 ppb
2019-12-109590-068-10582.60 ppb
2019-12-189590-068-0926ND
2019-12-189590-068-1115ND
2019-12-239590-068-09262.00 ppb
2019-12-239590-068-1020ND
2019-12-309590-068-10402.00 ppb
2019-12-309590-068-1200ND