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EWG's Tap Water Database — 2019 UPDATE

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Uranium

City of Paint Rock

NOTE: City of Paint Rock purchases water from Millersview-doole Water Supply Corporation which is required to test for uranium. Sample information shown below was taken by Millersview-doole Water Supply Corporation.

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
20130.30 pCi/L72ND - 1.27 pCi/L
20140.40 pCi/L42ND - 0.87 pCi/L
20150.31 pCi/L31ND - 0.94 pCi/L
20160.22 pCi/L82ND - 1.01 pCi/L
2017ND40ND

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

NOTE: City of Paint Rock purchases water from Millersview-doole Water Supply Corporation which is required to test for uranium. Sample information shown below was taken by Millersview-doole Water Supply Corporation.

Date Lab ID Result
2012-03-06AB83311ND
2012-05-22AB90778ND
2012-09-06AC00398ND
2012-12-27AC07335ND
2013-03-13AC13380ND
2013-06-26AC23223ND
2013-06-26AC232221.27 pCi/L
2013-07-22AC25785ND
2013-07-22AC25784ND
2013-11-14AC35186ND
2013-11-14AC351850.80 pCi/L
2014-02-27AC449780.74 pCi/L
2014-02-27AC44985ND
2014-04-22AC51340ND
2014-04-22AC51338ND
2014-09-17AC67248ND
2014-09-17AC67249ND
2014-11-18AC725630.67 pCi/L
2014-11-18AC72623ND
2015-02-03AC794200.87 pCi/L
2015-02-03AC79421ND
2015-05-19AC92508ND
2015-05-19AC92509ND
2015-09-28AD08869ND
2015-09-28AD08868ND
2015-11-03AD12305ND
2015-11-03AD12306ND
2016-02-17AD242311.01 pCi/L
2016-02-17AD24230ND
2016-05-18AD37188ND
2016-05-18AD37191ND
2016-07-21AD45144ND
2016-07-21AD45142ND
2016-12-01AD598030.74 pCi/L
2016-12-01AD59800ND
2017-03-01AD73040ND
2017-05-17AD84789ND
2017-07-27AD91022ND
2017-11-02AE03384ND