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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

Hillview Water Co-raymond

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

 

125

Samples

70

Samples exceeding legal limit (MCL)

96

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201415.5 ppb882.10 ppb - 27.0 ppb
201515.0 ppb552.80 ppb - 25.0 ppb
201620.5 ppb4416.0 ppb - 24.0 ppb
201711.0 ppb85ND - 25.0 ppb
201813.9 ppb1511ND - 25.0 ppb
20199.30 ppb8563ND - 20.0 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
2014-02-195810-016-095022.0 ppb
2014-04-175810-004-09552.10 ppb
2014-04-175810-006-11052.30 ppb
2014-04-175810-010-10008.50 ppb
2014-04-175810-016-113827.0 ppb
2014-05-225810-016-121019.0 ppb
2014-08-185810-016-114121.0 ppb
2014-11-175810-016-111522.0 ppb
2015-02-095810-016-11304.00 ppb
2015-05-195810-016-110024.0 ppb
2015-07-285810-019-12202.80 ppb
2015-08-185810-016-120625.0 ppb
2015-11-105810-016-113919.0 ppb
2016-02-095810-016-114616.0 ppb
2016-05-235810-016-114624.0 ppb
2016-08-095810-016-115323.0 ppb
2016-11-085810-016-132519.0 ppb
2017-02-145810-016-11457.80 ppb
2017-04-115810-004-1029ND
2017-04-115810-006-1050ND
2017-04-115810-010-1019ND
2017-04-115810-016-110314.0 ppb
2017-05-165810-016-103525.0 ppb
2017-08-085810-016-120924.0 ppb
2017-11-075810-016-122117.0 ppb
2018-02-065810-016-113023.0 ppb
2018-05-085810-016-124525.0 ppb
2018-07-105810-019-132815.0 ppb
2018-08-015810-016-104123.0 ppb
2018-08-015810-018-104014.0 ppb
2018-08-015810-020-102022.0 ppb
2018-11-065810-016-093017.0 ppb
2018-12-045810-021-131519.0 ppb
2018-12-045810-022-1327ND
2018-12-125810-021-101519.0 ppb
2018-12-125810-022-1035ND
2018-12-185810-021-150615.0 ppb
2018-12-185810-022-1530ND
2018-12-275810-021-110717.0 ppb
2018-12-275810-022-1110ND
2019-01-025810-021-151515.0 ppb
2019-01-025810-022-1517ND
2019-01-085810-021-141915.0 ppb
2019-01-085810-022-1428ND
2019-01-155810-021-141217.0 ppb
2019-01-155810-022-1440ND
2019-01-255810-021-115217.0 ppb
2019-01-255810-022-1210ND
2019-01-295810-021-111116.0 ppb
2019-01-295810-022-1124ND
2019-02-065810-016-153212.0 ppb
2019-02-075810-021-091214.0 ppb
2019-02-075810-022-0915ND
2019-02-125810-021-145017.0 ppb
2019-02-125810-022-1505ND
2019-02-205810-021-134014.0 ppb
2019-02-205810-022-1400ND
2019-02-265810-021-132015.0 ppb
2019-02-265810-022-1353ND
2019-03-065810-021-154514.0 ppb
2019-03-065810-022-1533ND
2019-03-125810-021-135016.0 ppb
2019-03-125810-022-1358ND
2019-03-195810-021-143017.0 ppb
2019-03-195810-022-1445ND
2019-03-265810-021-152015.0 ppb
2019-03-265810-022-1535ND
2019-04-025810-021-111814.0 ppb
2019-04-025810-022-1215ND
2019-04-095810-021-140015.0 ppb
2019-04-095810-022-1406ND
2019-04-165810-021-151516.0 ppb
2019-04-165810-022-1527ND
2019-04-235810-021-152516.0 ppb
2019-04-235810-022-1613ND
2019-04-305810-021-150015.0 ppb
2019-04-305810-022-1620ND
2019-05-075810-021-153515.0 ppb
2019-05-075810-022-1554ND
2019-05-145810-021-160517.0 ppb
2019-05-145810-022-1608ND
2019-05-215810-021-153315.0 ppb
2019-05-215810-022-1523ND
2019-05-285810-021-152315.0 ppb
2019-05-285810-022-1540ND
2019-06-045810-021-161018.0 ppb
2019-06-045810-022-16193.10 ppb
2019-06-115810-021-151718.0 ppb
2019-06-115810-022-15314.50 ppb
2019-06-185810-021-152216.0 ppb
2019-06-185810-022-15295.10 ppb
2019-06-255810-021-115117.0 ppb
2019-06-255810-022-11504.10 ppb
2019-07-025810-021-115019.0 ppb
2019-07-025810-022-12043.50 ppb
2019-07-095810-021-162319.0 ppb
2019-07-095810-022-16373.50 ppb
2019-07-165810-021-050020.0 ppb
2019-07-165810-022-05093.60 ppb
2019-07-245810-021-081920.0 ppb
2019-07-245810-022-08215.70 ppb
2019-07-305810-021-115018.0 ppb
2019-07-305810-022-12326.10 ppb
2019-08-065810-021-131518.0 ppb
2019-08-065810-022-13244.40 ppb
2019-08-135810-021-152218.0 ppb
2019-08-135810-022-15263.90 ppb
2019-08-205810-021-155216.0 ppb
2019-08-205810-022-15532.60 ppb
2019-08-275810-021-135118.0 ppb
2019-08-275810-022-13473.20 ppb
2019-09-035810-021-152716.0 ppb
2019-09-035810-022-15265.70 ppb
2019-09-105810-021-142817.0 ppb
2019-09-105810-022-14294.90 ppb
2019-09-175810-021-103018.0 ppb
2019-09-175810-022-10303.50 ppb
2019-09-245810-021-151819.0 ppb
2019-09-245810-022-15203.70 ppb
2019-10-015810-021-142819.0 ppb
2019-10-015810-022-14303.70 ppb
2019-11-055810-021-135917.0 ppb
2019-11-055810-022-13404.30 ppb
2019-12-035810-021-104515.0 ppb
2019-12-035810-022-10503.20 ppb