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EWG's Tap Water Database — 2021 UPDATE

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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.

MORE ABOUT THIS CONTAMINANT

 

195

Samples

92

Samples exceeding legal limit (MCL)

167

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201410.5 ppb2018ND - 47.0 ppb
20156.89 ppb1211ND - 13.0 ppb
20167.71 ppb1311ND - 14.0 ppb
201718.1 ppb2322ND - 48.0 ppb
201810.2 ppb3227ND - 26.0 ppb
201910.9 ppb9578ND - 43.0 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
2014-03-055810-030-092511.0 ppb
2014-03-055810-031-091013.0 ppb
2014-03-055810-033-090047.0 ppb
2014-03-055810-034-094037.0 ppb
2014-03-135810-001-1310ND
2014-05-225810-002-15104.10 ppb
2014-05-225810-003-14584.80 ppb
2014-05-225810-007-154515.0 ppb
2014-05-225810-009-155514.0 ppb
2014-05-225810-024-15223.00 ppb
2014-05-225810-028-1425ND
2014-06-245810-001-11304.50 ppb
2014-06-245810-024-11425.10 ppb
2014-06-245810-030-134613.0 ppb
2014-09-245810-001-12114.20 ppb
2014-09-245810-024-11563.90 ppb
2014-09-245810-030-102913.0 ppb
2014-12-175810-001-11042.20 ppb
2014-12-175810-024-11133.80 ppb
2014-12-175810-030-104511.0 ppb
2015-03-095810-001-113911.0 ppb
2015-03-095810-024-11457.10 ppb
2015-03-095810-030-103811.0 ppb
2015-06-085810-001-10353.80 ppb
2015-06-085810-024-10402.50 ppb
2015-06-085810-030-115211.0 ppb
2015-09-155810-001-10593.00 ppb
2015-09-155810-024-1049ND
2015-09-155810-030-113013.0 ppb
2015-12-155810-001-10325.00 ppb
2015-12-155810-024-10372.30 ppb
2015-12-155810-030-094013.0 ppb
2016-03-015810-001-1042ND
2016-03-015810-024-10502.00 ppb
2016-03-015810-030-100013.0 ppb
2016-06-075810-001-10409.90 ppb
2016-06-075810-030-093211.0 ppb
2016-09-135810-001-110812.0 ppb
2016-09-135810-030-093411.0 ppb
2016-12-065810-001-10557.30 ppb
2016-12-065810-017-1414ND
2016-12-065810-030-103313.0 ppb
2016-12-065810-039-142814.0 ppb
2016-12-065810-040-14363.40 ppb
2016-12-065810-041-14443.60 ppb
2017-01-165810-039-14535.50 ppb
2017-03-075810-001-091022.0 ppb
2017-03-075810-030-110030.0 ppb
2017-03-285810-030-103012.0 ppb
2017-03-285810-031-104023.0 ppb
2017-03-285810-032-104542.0 ppb
2017-03-285810-033-105048.0 ppb
2017-03-285810-034-110627.0 ppb
2017-04-115810-039-133030.0 ppb
2017-05-165810-002-09408.50 ppb
2017-05-165810-003-09205.50 ppb
2017-05-165810-007-111418.0 ppb
2017-05-165810-009-134117.0 ppb
2017-05-165810-010-134747.0 ppb
2017-05-165810-028-0906ND
2017-06-205810-001-11104.30 ppb
2017-06-205810-030-103315.0 ppb
2017-07-115810-039-135714.0 ppb
2017-09-055810-001-14324.70 ppb
2017-09-055810-030-145514.0 ppb
2017-10-105810-039-15057.00 ppb
2017-12-075810-001-11504.90 ppb
2017-12-075810-030-103316.0 ppb
2018-01-025810-039-13158.20 ppb
2018-03-015810-001-09084.60 ppb
2018-03-015810-030-081317.0 ppb
2018-03-015810-031-082522.0 ppb
2018-04-035810-039-09437.00 ppb
2018-04-305810-024-14456.50 ppb
2018-04-305810-046-14104.50 ppb
2018-04-305810-047-14107.50 ppb
2018-04-305810-048-14325.00 ppb
2018-06-125810-001-14502.30 ppb
2018-06-125810-030-110517.0 ppb
2018-06-125810-031-111026.0 ppb
2018-07-105810-039-13264.70 ppb
2018-07-255810-009-100022.0 ppb
2018-07-255810-010-102519.0 ppb
2018-09-125810-001-08488.60 ppb
2018-09-125810-024-085513.0 ppb
2018-09-125810-030-094517.0 ppb
2018-09-125810-031-101517.0 ppb
2018-09-195810-001-09113.60 ppb
2018-10-095810-039-11466.30 ppb
2018-12-045810-013-1646ND
2018-12-045810-027-164624.0 ppb
2018-12-045810-030-100217.0 ppb
2018-12-055810-001-09003.60 ppb
2018-12-055810-024-09224.60 ppb
2018-12-115810-013-1238ND
2018-12-115810-050-121821.0 ppb
2018-12-185810-013-1026ND
2018-12-185810-027-1008ND
2018-12-275810-013-1309ND
2018-12-275810-027-125818.0 ppb
2019-01-025810-013-11052.30 ppb
2019-01-025810-027-110515.0 ppb
2019-01-085810-013-1018ND
2019-01-085810-027-101612.0 ppb
2019-01-155810-013-10493.20 ppb
2019-01-155810-027-104727.0 ppb
2019-01-215810-013-13244.60 ppb
2019-01-215810-027-132015.0 ppb
2019-02-015810-013-12004.10 ppb
2019-02-015810-027-115519.0 ppb
2019-02-075810-013-15054.80 ppb
2019-02-075810-027-150018.0 ppb
2019-02-125810-013-10473.10 ppb
2019-02-125810-027-104413.0 ppb
2019-02-205810-013-09572.30 ppb
2019-02-205810-027-095443.0 ppb
2019-02-265810-013-09462.70 ppb
2019-02-265810-027-094311.0 ppb
2019-03-065810-013-10172.50 ppb
2019-03-065810-024-09104.20 ppb
2019-03-065810-027-102017.0 ppb
2019-03-065810-030-085514.0 ppb
2019-03-065810-031-091024.0 ppb
2019-03-125810-013-09202.80 ppb
2019-03-125810-027-091435.0 ppb
2019-03-195810-013-0943ND
2019-03-195810-027-094020.0 ppb
2019-03-265810-013-0918ND
2019-03-265810-027-091520.0 ppb
2019-04-025810-013-0942ND
2019-04-025810-027-093917.0 ppb
2019-04-095810-013-1535ND
2019-04-095810-027-152921.0 ppb
2019-04-165810-013-1004ND
2019-04-165810-027-100417.0 ppb
2019-04-235810-013-0933ND
2019-04-235810-027-093016.0 ppb
2019-04-305810-013-0913ND
2019-04-305810-027-090617.0 ppb
2019-05-075810-013-09302.20 ppb
2019-05-075810-027-092418.0 ppb
2019-05-145810-013-0939ND
2019-05-145810-027-093320.0 ppb
2019-05-215810-013-0855ND
2019-05-215810-027-085018.0 ppb
2019-05-285810-013-10562.10 ppb
2019-05-285810-027-105325.0 ppb
2019-06-045810-013-0851ND
2019-06-045810-027-084621.0 ppb
2019-06-125810-013-1025ND
2019-06-125810-027-101019.0 ppb
2019-06-185810-013-11242.50 ppb
2019-06-185810-027-112122.0 ppb
2019-06-245810-001-09353.70 ppb
2019-06-245810-024-10507.20 ppb
2019-06-255810-013-1120ND
2019-06-255810-027-111520.0 ppb
2019-07-025810-013-1438ND
2019-07-025810-027-143322.0 ppb
2019-07-095810-013-1015ND
2019-07-095810-027-101322.0 ppb
2019-07-165810-013-1011ND
2019-07-165810-027-100221.0 ppb
2019-07-235810-013-09422.60 ppb
2019-07-235810-027-093923.0 ppb
2019-07-305810-013-14582.50 ppb
2019-07-305810-027-145322.0 ppb
2019-07-315810-001-10254.40 ppb
2019-07-315810-024-10563.60 ppb
2019-08-065810-013-09472.60 ppb
2019-08-065810-027-094424.0 ppb
2019-08-135810-013-11232.80 ppb
2019-08-135810-027-112021.0 ppb
2019-08-205810-013-10322.40 ppb
2019-08-205810-027-103127.0 ppb
2019-08-275810-013-11453.00 ppb
2019-08-275810-027-114323.0 ppb
2019-09-035810-013-11542.20 ppb
2019-09-035810-027-115223.0 ppb
2019-09-105810-013-11142.50 ppb
2019-09-105810-027-110823.0 ppb
2019-09-175810-013-15502.20 ppb
2019-09-175810-027-154823.0 ppb
2019-09-245810-013-09442.40 ppb
2019-09-245810-027-094224.0 ppb
2019-10-015810-013-12413.60 ppb
2019-10-015810-027-120926.0 ppb
2019-10-145810-001-09003.30 ppb
2019-10-145810-024-10132.70 ppb
2019-11-055810-013-09262.40 ppb
2019-11-055810-027-092424.0 ppb
2019-12-035810-013-1318ND
2019-12-035810-027-131521.0 ppb
2019-12-115810-039-08503.70 ppb
2019-12-115810-041-09056.60 ppb