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EWG's Tap Water Database — 2021 UPDATE

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Uranium

Lake Arrowhead CSD

Uranium is a known human carcinogen. The federal legal limit for uranium is set at 30 micrograms per liter (corresponding to parts per billion), but utilities can also report uranium in picocuries per liter (pCi/L), which is a measure of radioactivity in water. EWG translated all uranium results to pCi/L using a conversion factor developed by the EPA. With this conversion approach, the limit of 30 ppb corresponds to 20 pCi/L. Drinking water with this much uranium would cause more than 4.6 cancer cases in a population of 100,000. California set a public health goal for uranium of 0.43 pCi/L. Read More.

Multiple forms of uranium can be detected in water, including uranium-234, uranium-235 and uranium-238. Uranium-234 is the most toxic form of uranium for human health.

 

561

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.03 pCi/L862ND - 1.30 pCi/L
20150.06 pCi/L964ND - 1.90 pCi/L
20160.03 pCi/L741ND - 1.90 pCi/L
20170.18 pCi/L1024ND - 8.60 pCi/L
2018ND1010ND
2019ND1020ND

pCi/L = picocuries per liter

State and national drinking water standards and health guidelines

EWG Health Guideline 0.43 pCi/L

The EWG Health Guideline of 0.43 pCi/L for uranium 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. Three most common uranium isotopes are U-234, U-235 and U-238. All isotopes of uranium are radioactive, and the total radioactivity depends on the ratio of isotopes. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 20 pCi/L

pCi/L = picocuries per liter

All test results

Date Lab ID Result
2014-01-083761-010-10251.30 pCi/L
2014-01-083761-011-1026ND
2014-01-153761-010-0955ND
2014-01-153761-011-0956ND
2014-01-223761-010-0820ND
2014-01-223761-011-0820ND
2014-01-293761-010-0925ND
2014-01-293761-011-0925ND
2014-02-053761-010-0810ND
2014-02-053761-011-0810ND
2014-02-123761-010-0949ND
2014-02-123761-011-0950ND
2014-02-193761-010-0932ND
2014-02-193761-011-0932ND
2014-02-263761-010-0900ND
2014-02-263761-011-0900ND
2014-03-053761-010-1019ND
2014-03-053761-011-1020ND
2014-03-123761-010-0850ND
2014-03-123761-011-0850ND
2014-03-183761-010-0951ND
2014-03-193761-011-0951ND
2014-03-263761-010-0915ND
2014-03-263761-011-0915ND
2014-04-023761-010-0931ND
2014-04-023761-011-0932ND
2014-04-093761-010-1000ND
2014-04-093761-011-1000ND
2014-04-163761-010-0935ND
2014-04-163761-011-0936ND
2014-04-233761-010-0947ND
2014-04-233761-011-0948ND
2014-04-303761-010-0935ND
2014-04-303761-011-0936ND
2014-05-073761-010-1001ND
2014-05-073761-011-1003ND
2014-05-143761-010-0933ND
2014-05-143761-011-0933ND
2014-05-213761-011-0928ND
2014-05-223761-010-0927ND
2014-05-283761-010-0920ND
2014-05-283761-011-0920ND
2014-06-043761-010-1017ND
2014-06-043761-011-1018ND
2014-06-113761-010-0845ND
2014-06-113761-011-0846ND
2014-06-183761-010-0825ND
2014-06-183761-011-08261.20 pCi/L
2014-06-253761-010-0921ND
2014-06-253761-011-0922ND
2014-07-023761-010-1015ND
2014-07-023761-011-1016ND
2014-07-093761-010-0825ND
2014-07-093761-011-0826ND
2014-07-163761-010-0845ND
2014-07-163761-011-0846ND
2014-07-233761-010-0935ND
2014-07-233761-011-0936ND
2014-07-303761-010-1001ND
2014-07-303761-011-1002ND
2014-08-063761-010-1044ND
2014-08-063761-011-1042ND
2014-08-133761-010-0855ND
2014-08-133761-011-0855ND
2014-08-273761-010-0951ND
2014-08-273761-011-0952ND
2014-09-033761-010-0935ND
2014-09-033761-011-0936ND
2014-09-103761-010-1011ND
2014-09-103761-011-1012ND
2014-09-173761-010-0920ND
2014-09-173761-011-0920ND
2014-09-243761-010-1048ND
2014-09-243761-011-1049ND
2014-10-013761-010-0900ND
2014-10-013761-011-0901ND
2014-10-083761-010-1007ND
2014-10-083761-011-1008ND
2014-10-153761-010-0845ND
2014-10-153761-011-0846ND
2014-10-223761-010-0930ND
2014-10-223761-011-0930ND
2014-11-193761-010-0835ND
2014-11-193761-011-0837ND
2014-11-263761-010-0938ND
2014-11-263761-011-0938ND
2015-01-213761-010-1000ND
2015-01-213761-011-1000ND
2015-02-043761-010-0944ND
2015-02-043761-011-0946ND
2015-02-113761-010-0918ND
2015-02-113761-011-0919ND
2015-02-183761-010-0946ND
2015-02-183761-011-0946ND
2015-02-253761-010-0810ND
2015-02-253761-011-0811ND
2015-03-043761-010-1014ND
2015-03-043761-011-1015ND
2015-03-113761-010-1015ND
2015-03-113761-011-1015ND
2015-03-183761-010-1005ND
2015-03-183761-011-1005ND
2015-03-253761-010-1008ND
2015-03-253761-011-1009ND
2015-04-013761-010-0945ND
2015-04-013761-011-0946ND
2015-04-083761-010-1045ND
2015-04-083761-011-1045ND
2015-04-153761-010-1033ND
2015-04-153761-011-1034ND
2015-04-223761-010-0905ND
2015-04-223761-011-0908ND
2015-04-293761-010-1050ND
2015-04-293761-011-1050ND
2015-05-063761-010-1037ND
2015-05-063761-011-1038ND
2015-05-133761-010-1019ND
2015-05-133761-011-1020ND
2015-05-203761-010-1019ND
2015-05-203761-011-1020ND
2015-05-273761-010-1020ND
2015-05-273761-011-1020ND
2015-06-033761-010-1028ND
2015-06-033761-011-1029ND
2015-06-103761-010-1138ND
2015-06-103761-011-1139ND
2015-06-173761-010-09201.90 pCi/L
2015-06-173761-011-09211.50 pCi/L
2015-06-243761-010-0852ND
2015-06-243761-011-0853ND
2015-07-013761-010-1044ND
2015-07-013761-011-1046ND
2015-07-083761-010-0950ND
2015-07-083761-011-0951ND
2015-07-153761-010-1117ND
2015-07-153761-011-1118ND
2015-07-223761-010-0850ND
2015-07-223761-011-0850ND
2015-07-293761-010-0000ND
2015-07-293761-011-0000ND
2015-08-053761-010-10431.40 pCi/L
2015-08-053761-011-1044ND
2015-08-123761-010-1119ND
2015-08-123761-011-1120ND
2015-08-193761-010-0941ND
2015-08-193761-011-0941ND
2015-08-263761-010-0913ND
2015-08-263761-011-0913ND
2015-09-023761-010-0938ND
2015-09-023761-011-0939ND
2015-09-093761-010-0926ND
2015-09-093761-011-0927ND
2015-09-163761-010-0935ND
2015-09-163761-011-0935ND
2015-09-233761-010-0921ND
2015-09-233761-011-0922ND
2015-10-073761-010-0945ND
2015-10-073761-011-0945ND
2015-10-143761-010-0959ND
2015-10-143761-011-1000ND
2015-10-213761-010-0851ND
2015-10-213761-011-0852ND
2015-10-283761-010-0940ND
2015-10-283761-011-0940ND
2015-11-043761-010-1241ND
2015-11-043761-011-1242ND
2015-11-113761-010-0950ND
2015-11-113761-011-09511.10 pCi/L
2015-11-183761-010-1026ND
2015-11-183761-011-1026ND
2015-11-253761-010-0928ND
2015-11-253761-011-0928ND
2015-12-023761-010-0948ND
2015-12-023761-011-0949ND
2015-12-093761-010-1010ND
2015-12-093761-011-1011ND
2015-12-163761-010-0907ND
2015-12-163761-011-0908ND
2015-12-233761-010-1002ND
2015-12-233761-011-1004ND
2015-12-303761-010-0925ND
2015-12-303761-011-0926ND
2016-01-063761-010-1010ND
2016-01-063761-011-10111.90 pCi/L
2016-01-133761-010-0940ND
2016-01-133761-011-0940ND
2016-04-203761-010-0933ND
2016-04-203761-011-0934ND
2016-04-273761-010-0934ND
2016-04-273761-011-0933ND
2016-05-043761-010-1001ND
2016-05-043761-011-1002ND
2016-05-113761-010-0936ND
2016-05-113761-011-0936ND
2016-05-183761-010-1029ND
2016-05-183761-011-1029ND
2016-05-253761-010-0938ND
2016-05-253761-011-0939ND
2016-06-013761-010-0935ND
2016-06-013761-011-0936ND
2016-06-083761-010-1020ND
2016-06-083761-011-1020ND
2016-06-153761-010-0910ND
2016-06-153761-011-0913ND
2016-06-223761-010-0920ND
2016-06-223761-011-0922ND
2016-06-293761-010-0853ND
2016-06-293761-011-0854ND
2016-07-063761-010-0943ND
2016-07-063761-011-0945ND
2016-07-133761-010-1027ND
2016-07-133761-011-1028ND
2016-07-203761-010-0925ND
2016-07-203761-011-0928ND
2016-07-273761-010-0922ND
2016-07-273761-011-0923ND
2016-08-023761-010-0847ND
2016-08-023761-011-0850ND
2016-08-103761-010-0933ND
2016-08-103761-011-0934ND
2016-08-173761-010-0938ND
2016-08-173761-011-0940ND
2016-08-243761-010-0942ND
2016-08-243761-011-0943ND
2016-08-313761-010-1017ND
2016-08-313761-011-1018ND
2016-09-073761-010-0830ND
2016-09-073761-011-0831ND
2016-09-143761-010-0952ND
2016-09-143761-011-0954ND
2016-09-213761-010-0928ND
2016-09-213761-011-0929ND
2016-09-283761-010-1000ND
2016-09-283761-011-1001ND
2016-10-053761-010-0929ND
2016-10-053761-011-0930ND
2016-10-123761-010-0927ND
2016-10-123761-011-0929ND
2016-11-023761-010-0846ND
2016-11-023761-011-0848ND
2016-11-093761-010-0910ND
2016-11-093761-011-0912ND
2016-11-163761-010-0932ND
2016-11-163761-011-0935ND
2016-11-233761-010-1001ND
2016-11-233761-011-1002ND
2016-11-303761-010-0941ND
2016-11-303761-011-0942ND
2016-12-073761-010-0941ND
2016-12-073761-011-0941ND
2016-12-143761-010-0940ND
2016-12-143761-011-0940ND
2016-12-213761-010-1010ND
2016-12-213761-011-1011ND
2016-12-283761-010-1020ND
2016-12-283761-011-1020ND
2017-01-043761-010-0935ND
2017-01-043761-011-0937ND
2017-01-183761-010-0955ND
2017-01-183761-011-0956ND
2017-01-253761-010-1028ND
2017-01-253761-011-1028ND
2017-02-013761-010-0914ND
2017-02-013761-011-0913ND
2017-02-083761-010-0828ND
2017-02-083761-011-08301.00 pCi/L
2017-02-153761-010-0845ND
2017-02-153761-011-0850ND
2017-02-223761-010-0934ND
2017-02-223761-011-0936ND
2017-03-013761-010-0937ND
2017-03-013761-011-0938ND
2017-03-083761-010-0930ND
2017-03-083761-011-0935ND
2017-03-153761-010-0946ND
2017-03-153761-011-0948ND
2017-03-223761-010-0950ND
2017-03-223761-011-0952ND
2017-03-293761-010-0945ND
2017-03-293761-011-0946ND
2017-04-053761-010-0935ND
2017-04-053761-011-0940ND
2017-04-123761-010-1029ND
2017-04-123761-011-1030ND
2017-04-193761-010-0907ND
2017-04-193761-011-0908ND
2017-04-263761-010-0917ND
2017-04-263761-011-0919ND
2017-05-033761-010-0000ND
2017-05-033761-011-0000ND
2017-05-103761-010-0845ND
2017-05-103761-011-0846ND
2017-05-173761-010-0857ND
2017-05-173761-011-0859ND
2017-05-243761-010-0907ND
2017-05-243761-011-0907ND
2017-05-313761-010-0840ND
2017-05-313761-011-0845ND
2017-06-073761-010-0859ND
2017-06-073761-011-0901ND
2017-06-143761-010-0930ND
2017-06-143761-011-0931ND
2017-06-213761-010-0855ND
2017-06-213761-011-0857ND
2017-06-283761-010-0945ND
2017-06-283761-011-0945ND
2017-07-053761-010-0940ND
2017-07-053761-011-0940ND
2017-07-123761-010-0930ND
2017-07-123761-011-0935ND
2017-07-193761-010-0926ND
2017-07-193761-011-0930ND
2017-07-263761-010-0921ND
2017-07-263761-011-0923ND
2017-08-023761-010-0900ND
2017-08-023761-011-09021.50 pCi/L
2017-08-093761-010-0850ND
2017-08-093761-011-0852ND
2017-08-163761-010-0912ND
2017-08-163761-011-0914ND
2017-08-233761-010-0840ND
2017-08-233761-011-0841ND
2017-08-303761-010-0935ND
2017-08-303761-011-0940ND
2017-09-063761-010-0827ND
2017-09-063761-011-0829ND
2017-09-133761-010-0920ND
2017-09-133761-011-0925ND
2017-09-203761-010-0855ND
2017-09-203761-011-0856ND
2017-09-273761-010-0947ND
2017-09-273761-011-0947ND
2017-10-023761-010-0915ND
2017-10-023761-011-0915ND
2017-10-103761-010-0905ND
2017-10-103761-011-0910ND
2017-10-183761-010-0914ND
2017-10-183761-011-0915ND
2017-10-253761-010-0948ND
2017-10-253761-011-0949ND
2017-11-013761-010-0903ND
2017-11-013761-011-0904ND
2017-11-083761-010-1015ND
2017-11-083761-011-1017ND
2017-11-153761-010-0903ND
2017-11-153761-011-0904ND
2017-11-223761-010-1130ND
2017-11-223761-011-1135ND
2017-11-283761-010-16006.90 pCi/L
2017-11-283761-011-16018.60 pCi/L
2017-12-069588-010-0954ND
2017-12-069588-011-0955ND
2017-12-139588-010-0934ND
2017-12-139588-011-0934ND
2017-12-209588-010-0920ND
2017-12-209588-011-0921ND
2017-12-279588-010-0912ND
2017-12-279588-011-0913ND
2018-01-039588-010-0919ND
2018-01-039588-011-0920ND
2018-01-103761-010-0910ND
2018-01-103761-011-0912ND
2018-01-173761-010-0910ND
2018-01-173761-011-0911ND
2018-01-243761-010-0935ND
2018-01-243761-011-0937ND
2018-01-313761-010-0912ND
2018-01-313761-011-0913ND
2018-02-073761-010-0910ND
2018-02-073761-011-0911ND
2018-02-143761-010-0920ND
2018-02-143761-011-0922ND
2018-02-213761-010-0918ND
2018-02-213761-011-0918ND
2018-02-283761-010-0920ND
2018-02-283761-011-0921ND
2018-03-073761-010-0900ND
2018-03-073761-011-0905ND
2018-03-133761-010-0905ND
2018-03-133761-011-0906ND
2018-03-203761-010-0920ND
2018-03-203761-011-0921ND
2018-03-273761-010-0920ND
2018-03-273761-011-0930ND
2018-04-033761-010-0908ND
2018-04-033761-011-0909ND
2018-04-113761-010-0917ND
2018-04-113761-011-0918ND
2018-04-183761-010-0935ND
2018-04-183761-011-0936ND
2018-04-253761-010-0837ND
2018-04-253761-011-0838ND
2018-05-013761-010-0950ND
2018-05-013761-011-0955ND
2018-05-093761-010-0926ND
2018-05-093761-011-0927ND
2018-05-163761-010-0922ND
2018-05-163761-011-0922ND
2018-05-233761-010-0900ND
2018-05-233761-011-0901ND
2018-05-303761-010-0835ND
2018-05-303761-011-0836ND
2018-06-063761-010-0855ND
2018-06-063761-011-0857ND
2018-06-133761-010-0905ND
2018-06-133761-011-0906ND
2018-06-203761-010-0826ND
2018-06-203761-011-0827ND
2018-06-273761-010-0900ND
2018-06-273761-011-0905ND
2018-07-023761-010-0845ND
2018-07-023761-011-0850ND
2018-07-113761-010-0945ND
2018-07-113761-011-0950ND
2018-07-183761-010-0900ND
2018-07-253761-010-0955ND
2018-07-253761-011-0956ND
2018-08-033761-010-1445ND
2018-08-033761-011-1450ND
2018-08-083761-010-0850ND
2018-08-083761-011-0851ND
2018-08-153761-010-0915ND
2018-08-153761-011-0915ND
2018-08-223761-010-0903ND
2018-08-223761-011-0904ND
2018-08-293761-010-0905ND
2018-08-293761-011-0910ND
2018-09-033761-010-0950ND
2018-09-033761-011-0951ND
2018-09-123761-010-0815ND
2018-09-123761-011-0815ND
2018-09-263761-010-0900ND
2018-09-263761-011-0900ND
2018-10-033761-010-1000ND
2018-10-033761-011-1002ND
2018-10-103761-010-0853ND
2018-10-103761-011-0854ND
2018-10-173761-010-0832ND
2018-10-173761-011-0833ND
2018-10-243761-010-0846ND
2018-10-243761-011-0847ND
2018-10-313761-010-1201ND
2018-10-313761-011-1202ND
2018-11-073761-010-0850ND
2018-11-073761-011-0851ND
2018-11-143761-010-0932ND
2018-11-143761-011-0933ND
2018-11-213761-010-1000ND
2018-11-213761-011-1005ND
2018-11-283761-010-0950ND
2018-11-283761-011-0951ND
2018-12-053761-010-0915ND
2018-12-053761-011-0916ND
2018-12-123761-010-0925ND
2018-12-123761-011-0930ND
2018-12-193761-010-0920ND
2018-12-193761-011-0925ND
2018-12-263761-010-1000ND
2018-12-263761-011-1001ND
2019-01-023761-010-1050ND
2019-01-023761-011-1051ND
2019-01-093761-010-0949ND
2019-01-093761-011-0950ND
2019-01-143761-010-0843ND
2019-01-143761-011-0843ND
2019-01-233761-010-0942ND
2019-01-233761-011-0943ND
2019-01-303761-010-0915ND
2019-01-303761-011-0916ND
2019-02-063761-010-0952ND
2019-02-063761-011-0953ND
2019-02-123761-010-1000ND
2019-02-123761-011-1000ND
2019-02-203761-010-1015ND
2019-02-203761-011-1016ND
2019-02-273761-010-0916ND
2019-02-273761-011-0917ND
2019-03-053761-010-0927ND
2019-03-053761-011-0928ND
2019-03-133761-010-1030ND
2019-03-133761-011-1031ND
2019-03-203761-010-0852ND
2019-03-203761-011-0853ND
2019-03-273761-010-0845ND
2019-03-273761-011-0845ND
2019-04-033761-010-0835ND
2019-04-033761-011-0836ND
2019-04-103761-010-0905ND
2019-04-103761-011-0910ND
2019-04-173761-010-0900ND
2019-04-173761-011-0905ND
2019-04-243761-010-0829ND
2019-04-243761-011-0830ND
2019-05-013761-010-0900ND
2019-05-013761-011-0905ND
2019-05-073761-010-0924ND
2019-05-073761-011-0924ND
2019-05-153761-010-0836ND
2019-05-153761-011-0837ND
2019-05-223761-010-0948ND
2019-05-223761-011-0949ND
2019-05-293761-010-0935ND
2019-05-293761-011-0936ND
2019-06-053761-010-0927ND
2019-06-053761-011-0928ND
2019-06-123761-010-0928ND
2019-06-123761-011-0929ND
2019-06-193761-010-0905ND
2019-06-193761-011-0910ND
2019-06-263761-010-0900ND
2019-06-263761-011-0905ND
2019-07-023761-010-0845ND
2019-07-023761-011-0846ND
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