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EWG's Tap Water Database — 2021 UPDATE

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Uranium

City of Bakersfield

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.

 

358

Samples

0

Samples exceeding legal limit (MCL)

234

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.96 pCi/L128127ND - 5.47 pCi/L
20152.31 pCi/L4238ND - 4.07 pCi/L
20161.23 pCi/L6518ND - 14.11 pCi/L
20170.89 pCi/L7523ND - 4.99 pCi/L
20182.32 pCi/L4125ND - 11.14 pCi/L
20192.01 pCi/L74ND - 5.90 pCi/L

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
2014-03-035701-103-11151.79 pCi/L
2014-03-035701-117-09403.71 pCi/L
2014-03-045701-100-11240.55 pCi/L
2014-05-015701-011-09451.17 pCi/L
2014-05-055701-037-13154.48 pCi/L
2014-05-055701-044-13004.94 pCi/L
2014-05-055701-074-14153.48 pCi/L
2014-05-055701-102-13452.48 pCi/L
2014-05-055701-103-14001.99 pCi/L
2014-05-275701-037-13554.19 pCi/L
2014-05-275701-044-13404.83 pCi/L
2014-05-275701-074-14452.32 pCi/L
2014-05-275701-102-14102.48 pCi/L
2014-05-275701-103-14302.09 pCi/L
2014-06-025701-033-10000.49 pCi/L
2014-06-025701-044-13454.98 pCi/L
2014-06-025701-074-14402.79 pCi/L
2014-06-025701-102-14102.34 pCi/L
2014-06-025701-103-14202.01 pCi/L
2014-06-055701-115-10201.53 pCi/L
2014-06-095701-044-14204.58 pCi/L
2014-06-095701-074-13003.14 pCi/L
2014-06-095701-102-14302.38 pCi/L
2014-06-095701-103-14502.01 pCi/L
2014-06-165701-044-14004.66 pCi/L
2014-06-165701-074-12303.27 pCi/L
2014-06-165701-102-14202.39 pCi/L
2014-06-165701-103-14452.06 pCi/L
2014-06-235701-044-13304.97 pCi/L
2014-06-235701-074-14302.91 pCi/L
2014-06-235701-102-13452.53 pCi/L
2014-06-235701-103-14002.17 pCi/L
2014-06-305701-044-12504.81 pCi/L
2014-06-305701-074-13402.86 pCi/L
2014-06-305701-102-13152.48 pCi/L
2014-06-305701-103-13302.20 pCi/L
2014-07-075701-038-08521.78 pCi/L
2014-07-075701-044-12454.47 pCi/L
2014-07-075701-074-13302.90 pCi/L
2014-07-075701-102-15002.28 pCi/L
2014-07-075701-103-13151.99 pCi/L
2014-07-085701-034-09360.81 pCi/L
2014-07-145701-044-13304.65 pCi/L
2014-07-145701-074-15153.03 pCi/L
2014-07-145701-102-13502.41 pCi/L
2014-07-145701-103-14152.15 pCi/L
2014-07-155701-109-09403.46 pCi/L
2014-07-235701-044-14252.04 pCi/L
2014-07-235701-074-14422.71 pCi/L
2014-07-235701-102-14102.25 pCi/L
2014-07-235701-103-13504.60 pCi/L
2014-07-285701-037-14404.17 pCi/L
2014-07-285701-044-12204.52 pCi/L
2014-07-285701-074-13403.52 pCi/L
2014-07-285701-102-13002.34 pCi/L
2014-07-285701-103-13202.08 pCi/L
2014-08-045701-074-13002.84 pCi/L
2014-08-115701-037-14454.21 pCi/L
2014-08-115701-044-14204.91 pCi/L
2014-08-115701-074-10303.66 pCi/L
2014-08-115701-102-13102.66 pCi/L
2014-08-115701-103-13252.43 pCi/L
2014-08-185701-037-13153.77 pCi/L
2014-08-185701-044-13004.76 pCi/L
2014-08-185701-074-14202.98 pCi/L
2014-08-185701-102-13252.52 pCi/L
2014-08-185701-103-13502.47 pCi/L
2014-08-195701-003-13581.58 pCi/L
2014-08-195701-023-10300.70 pCi/L
2014-08-255701-034-13380.79 pCi/L
2014-08-255701-037-12303.53 pCi/L
2014-08-255701-044-12204.60 pCi/L
2014-08-255701-074-13303.42 pCi/L
2014-08-255701-102-12502.47 pCi/L
2014-08-255701-103-13002.35 pCi/L
2014-09-025701-037-13203.77 pCi/L
2014-09-025701-044-13004.86 pCi/L
2014-09-025701-074-10553.62 pCi/L
2014-09-025701-102-14003.23 pCi/L
2014-09-025701-103-14152.73 pCi/L
2014-09-045701-034-13260.96 pCi/L
2014-09-085701-037-13203.42 pCi/L
2014-09-085701-044-13004.77 pCi/L
2014-09-085701-074-11153.46 pCi/L
2014-09-085701-102-14002.67 pCi/L
2014-09-085701-103-14102.81 pCi/L
2014-09-095701-033-14150.53 pCi/L
2014-09-105701-033-10430.51 pCi/L
2014-09-295701-037-10003.14 pCi/L
2014-09-295701-044-09454.54 pCi/L
2014-09-295701-046-09252.97 pCi/L
2014-09-295701-074-10303.22 pCi/L
2014-09-295701-102-10152.74 pCi/L
2014-10-065701-037-11452.98 pCi/L
2014-10-065701-038-12302.15 pCi/L
2014-10-065701-044-11304.32 pCi/L
2014-10-065701-046-10552.99 pCi/L
2014-10-065701-074-13303.02 pCi/L
2014-10-065701-102-12002.62 pCi/L
2014-10-065701-109-11303.85 pCi/L
2014-10-135701-037-13152.77 pCi/L
2014-10-135701-044-13004.40 pCi/L
2014-10-135701-074-14003.03 pCi/L
2014-10-135701-102-13302.67 pCi/L
2014-10-205701-037-14152.69 pCi/L
2014-10-205701-044-14304.10 pCi/L
2014-10-205701-074-13452.93 pCi/L
2014-10-205701-102-15002.58 pCi/L
2014-10-275701-003-15001.68 pCi/L
2014-10-275701-037-10004.44 pCi/L
2014-10-275701-044-10154.04 pCi/L
2014-10-275701-074-10452.96 pCi/L
2014-10-275701-102-10102.46 pCi/L
2014-10-285810-104-1408ND
2014-11-035701-037-13282.52 pCi/L
2014-11-035701-044-14304.06 pCi/L
2014-11-035701-074-11352.77 pCi/L
2014-11-035701-102-13352.50 pCi/L
2014-12-085701-033-09570.52 pCi/L
2014-12-085701-037-10102.76 pCi/L
2014-12-085701-044-10004.28 pCi/L
2014-12-085701-074-11302.90 pCi/L
2014-12-085701-102-10202.68 pCi/L
2014-12-155701-037-11402.70 pCi/L
2014-12-155701-044-11305.47 pCi/L
2014-12-155701-074-13002.96 pCi/L
2014-12-155701-102-11503.28 pCi/L
2014-12-295701-044-11503.50 pCi/L
2015-01-125701-037-09302.66 pCi/L
2015-01-125701-044-09503.71 pCi/L
2015-01-125701-074-10152.87 pCi/L
2015-01-125701-102-09402.54 pCi/L
2015-01-205701-037-12152.35 pCi/L
2015-01-205701-044-12053.59 pCi/L
2015-01-205701-074-14002.60 pCi/L
2015-01-205701-102-12302.45 pCi/L
2015-01-265701-037-10502.30 pCi/L
2015-01-265701-044-11353.51 pCi/L
2015-01-265701-074-11552.39 pCi/L
2015-01-265701-102-11152.45 pCi/L
2015-01-305701-038-09451.84 pCi/L
2015-02-025701-037-11102.20 pCi/L
2015-02-025701-038-10371.89 pCi/L
2015-02-025701-044-11203.50 pCi/L
2015-02-055701-017-11201.99 pCi/L
2015-02-095701-074-14002.30 pCi/L
2015-02-095701-102-10302.38 pCi/L
2015-03-025701-037-11404.07 pCi/L
2015-03-025701-038-14251.77 pCi/L
2015-03-025701-044-11303.10 pCi/L
2015-03-025701-074-15002.09 pCi/L
2015-03-025701-102-11502.50 pCi/L
2015-04-065701-037-14402.78 pCi/L
2015-04-065701-044-14153.54 pCi/L
2015-04-065701-074-13002.75 pCi/L
2015-04-065701-103-14501.77 pCi/L
2015-04-075701-038-11082.31 pCi/L
2015-04-135701-105-09250.12 pCi/L
2015-05-295701-126-14511.39 pCi/L
2015-06-025701-033-10300.64 pCi/L
2015-06-095701-115-12003.13 pCi/L
2015-06-155701-109-11203.99 pCi/L
2015-09-065701-037-0830ND
2015-09-065701-044-09502.53 pCi/L
2015-09-065701-074-1015ND
2015-09-065701-102-09152.12 pCi/L
2015-09-065701-103-0930ND
2015-09-085701-115-11303.05 pCi/L
2015-10-145701-109-08503.91 pCi/L
2015-12-295701-104-1430ND
2016-01-125701-109-11103.85 pCi/L
2016-01-315701-037-10372.02 pCi/L
2016-01-315701-044-08122.11 pCi/L
2016-01-315701-074-08452.34 pCi/L
2016-01-315701-102-10432.66 pCi/L
2016-01-315701-103-10492.58 pCi/L
2016-02-015701-104-1330ND
2016-02-225701-039-1025ND
2016-03-035701-115-12202.90 pCi/L
2016-03-065701-037-10122.57 pCi/L
2016-03-065701-044-0825ND
2016-03-065701-074-08452.12 pCi/L
2016-03-065701-102-0805ND
2016-03-175701-020-113114.11 pCi/L
2016-04-215701-139-1441ND
2016-04-265701-139-1012ND
2016-05-085701-037-0719ND
2016-05-085701-044-0709ND
2016-05-085701-074-0812ND
2016-05-085701-102-07312.02 pCi/L
2016-05-085701-103-1005ND
2016-05-155701-037-0921ND
2016-05-155701-044-0912ND
2016-05-155701-074-0947ND
2016-05-155701-102-0927ND
2016-05-155701-103-0933ND
2016-05-165701-126-1410ND
2016-05-225701-037-0902ND
2016-05-225701-044-0855ND
2016-05-225701-074-1016ND
2016-05-225701-102-0906ND
2016-05-225701-103-0920ND
2016-05-245701-041-10172.73 pCi/L
2016-06-035701-139-1300ND
2016-06-055701-037-0945ND
2016-06-055701-044-0925ND
2016-06-055701-074-1045ND
2016-06-055701-102-1015ND
2016-06-055701-103-1030ND
2016-06-215701-115-13302.95 pCi/L
2016-06-275701-004-12242.97 pCi/L
2016-07-035701-037-1030ND
2016-07-035701-044-1125ND
2016-07-035701-074-1145ND
2016-07-035701-102-1045ND
2016-07-035701-103-1105ND
2016-07-215701-139-0921ND
2016-08-105701-037-1115ND
2016-08-105701-044-1146ND
2016-08-105701-074-1210ND
2016-08-105701-102-1123ND
2016-08-105701-103-1132ND
2016-08-145701-037-1045ND
2016-08-145701-044-1140ND
2016-08-145701-074-1200ND
2016-08-145701-102-1055ND
2016-08-145701-103-1130ND
2016-09-295701-020-134513.43 pCi/L
2016-10-095701-037-09502.13 pCi/L
2016-10-095701-044-0930ND
2016-10-095701-074-1000ND
2016-10-095701-102-0940ND
2016-10-095701-103-0945ND
2016-12-065701-020-132213.70 pCi/L
2016-12-085701-115-13303.04 pCi/L
2017-01-045701-037-09402.17 pCi/L
2017-01-045701-044-1030ND
2017-01-045701-074-1100ND
2017-01-045701-102-1000ND
2017-01-045701-103-1020ND
2017-01-095701-109-13153.56 pCi/L
2017-01-185701-037-11302.01 pCi/L
2017-01-185701-044-1120ND
2017-01-185701-074-1100ND
2017-01-185701-102-1140ND
2017-01-185701-103-11502.23 pCi/L
2017-01-255701-037-10312.12 pCi/L
2017-01-255701-044-1018ND
2017-01-255701-074-1139ND
2017-01-255701-102-1041ND
2017-01-255701-103-10552.44 pCi/L
2017-02-025701-139-1127ND
2017-02-085701-037-10302.39 pCi/L
2017-02-085701-044-1015ND
2017-02-085701-074-1440ND
2017-02-085701-102-1100ND
2017-02-085701-103-11102.03 pCi/L
2017-02-155701-037-09452.35 pCi/L
2017-02-155701-044-0935ND
2017-02-155701-074-1400ND
2017-02-155701-102-0955ND
2017-02-155701-103-10102.08 pCi/L
2017-02-155701-126-1505ND
2017-03-175701-117-09494.03 pCi/L
2017-05-035701-037-1105ND
2017-05-035701-044-1115ND
2017-05-035701-074-1430ND
2017-05-035701-102-1130ND
2017-05-035701-103-1145ND
2017-05-105701-037-10402.53 pCi/L
2017-05-105701-044-1055ND
2017-05-105701-074-1400ND
2017-05-105701-102-1110ND
2017-05-105701-103-1125ND
2017-05-165701-126-1405ND
2017-05-175701-037-10362.77 pCi/L
2017-05-175701-044-1001ND
2017-05-175701-074-1341ND
2017-05-175701-102-1029ND
2017-05-175701-103-1053ND
2017-05-185701-038-1537ND
2017-05-185701-038-1630ND
2017-05-185701-144-1547ND
2017-05-185701-144-1634ND
2017-06-195701-037-09443.03 pCi/L
2017-06-195701-044-0934ND
2017-06-195701-074-1104ND
2017-06-195701-102-1021ND
2017-06-195701-103-09593.59 pCi/L
2017-06-225701-139-0944ND
2017-06-265701-037-10153.15 pCi/L
2017-06-265701-044-1025ND
2017-06-265701-074-1440ND
2017-06-265701-102-10402.42 pCi/L
2017-06-265701-103-1050ND
2017-06-265701-139-0906ND
2017-07-125701-108-1005ND
2017-07-125701-109-12204.20 pCi/L
2017-07-175701-037-0940ND
2017-07-175701-044-0950ND
2017-07-175701-074-1410ND
2017-07-175701-102-10052.69 pCi/L
2017-07-175701-103-1015ND
2017-09-195701-033-0936ND
2017-10-185701-037-10354.22 pCi/L
2017-10-185701-044-09504.99 pCi/L
2017-10-185701-074-11202.73 pCi/L
2017-10-185701-102-10463.39 pCi/L
2017-10-185701-103-1055ND
2017-12-145701-143-0924ND
2018-01-225701-037-10253.98 pCi/L
2018-02-055701-037-10203.81 pCi/L
2018-02-055701-044-10403.84 pCi/L
2018-02-055701-074-11254.19 pCi/L
2018-02-055701-102-10052.31 pCi/L
2018-02-055701-103-0950ND
2018-02-055701-145-09304.95 pCi/L
2018-02-065701-033-0915ND
2018-02-135701-033-1115ND
2018-02-145701-102-11102.36 pCi/L
2018-03-135701-033-1025ND
2018-04-095701-037-10433.02 pCi/L
2018-04-095701-044-09404.19 pCi/L
2018-04-095701-074-11022.98 pCi/L
2018-04-095701-102-10062.09 pCi/L
2018-04-095701-103-1022ND
2018-04-095701-145-10314.43 pCi/L
2018-04-105701-033-1115ND
2018-04-165701-044-13304.05 pCi/L
2018-04-165701-102-11552.02 pCi/L
2018-05-085701-010-0825ND
2018-05-165701-019-1005ND
2018-05-295701-041-09503.14 pCi/L
2018-06-255701-037-13483.98 pCi/L
2018-06-255701-038-10302.26 pCi/L
2018-06-255701-044-13423.59 pCi/L
2018-06-255701-074-12302.51 pCi/L
2018-06-255701-102-13552.56 pCi/L
2018-06-255701-103-1411ND
2018-06-255701-144-1034ND
2018-06-255701-145-14203.32 pCi/L
2018-06-275701-033-1335ND
2018-07-245701-143-1017ND
2018-08-155701-038-09362.24 pCi/L
2018-08-155701-144-0938ND
2018-10-155701-118-0915ND
2018-11-135701-020-151611.14 pCi/L
2018-11-269590-013-1140ND
2018-11-269590-118-1305ND
2018-12-189590-020-141010.00 pCi/L
2018-12-219590-012-17552.30 pCi/L
2019-01-149590-145-12455.90 pCi/L
2019-03-075701-115-1123ND
2019-06-135701-008-11302.07 pCi/L
2019-06-135701-021-08203.60 pCi/L
2019-07-195701-115-0835ND
2019-07-245701-046-11152.48 pCi/L
2019-09-105701-007-1115ND