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EWG's Tap Water Database — 2019 UPDATE

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Radium, combined (-226 & -228)

Sun Valley Gid

NOTE: Sun Valley Gid purchases water from Truckee Meadows Water Authority which is required to test for radium, combined (-226 & -228). Sample information shown below was taken by Truckee Meadows Water Authority.

Radium is a radioactive element that causes bone cancer and other cancers. It can occur naturally in groundwater, and oil and gas extraction activities such as hydraulic fracturing can elevate concentrations. Read More.

Radium releases radioactive particles that harm health in many ways, causing tumors in bone, lungs and other organs; leukemia; and skin and blood damage. Water utilities typically report radium amounts in picocuries per liter (pCi/L), which is a measure of radioactivity in water. The two most common forms of radium are radium-226 and radium-228. They may be reported separately or together.

Federal law allows up to 5 picocuries per liter of combined radium-226 and radium-228 in tap water. Research by the U.S. Geological Survey shows that in some regions of the country, such as the mid-continental region and North Atlantic coastal region, more than 20 percent of sampled wells have radium in levels exceeding the federal drinking water limit. And the legal limit does not equate safety: The EPA estimates that one in every 10,000 people drinking water containing radium at this level would develop cancer over a lifetime.

California set a public health goal much lower than the federal limit - 0.019 picocuries per liter of radium-226 and 0.05 picocuries per liter of radium-228, concentrations that are lower than the detection limit for most water tests.

Click here to read more on radiological contaminants.

 

73

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.31 pCi/L51ND - 1.57 pCi/L
20130.11 pCi/L61ND - 0.67 pCi/L
2014ND20ND
2015ND80ND
20160.08 pCi/L131ND - 1.00 pCi/L
20170.00 pCi/L392ND - 4.00 pCi/L

pCi/L = picocuries per liter

State and national drinking water standards and health guidelines

EWG Health Guideline 0.05 pCi/L

EWG applied the health guideline of 0.05 pCi/L, defined by the California Office of Environmental Health Hazard Assessment as a public health goal for radium-226, to radium-226 and radium-228 combined. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 5 pCi/L

The legal limit for combined radium-226 and radium-228, established in 1976, was based on costs for radium removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to radium exposure.

pCi/L = picocuries per liter

All test results

NOTE: Sun Valley Gid purchases water from Truckee Meadows Water Authority which is required to test for radium, combined (-226 & -228). Sample information shown below was taken by Truckee Meadows Water Authority.

Date Lab ID Result
2012-06-060612-09RND
2012-06-260612-32RND
2012-06-260612-33RND
2012-07-090612-32ND
2012-09-240912-24R1.57 pCi/L
2013-05-080513-17RND
2013-06-180613-20ND
2013-06-190613-23R1ND
2013-06-250613-54R10.67 pCi/L
2013-09-180913-13-RADND
2013-09-180913-13ND
2014-04-220414-12ND
2014-06-170614-09ND
2015-06-081506017-01ND
2015-06-111506027-RADND
2015-06-171506038-01ND
2015-06-231506055-01ND
2015-10-281510038-05EURND
2015-10-281510038-04EURND
2015-10-281510038-03EURND
2015-10-281510038-02EURND
2016-05-311605028-01EURND
2016-06-061606010-01EURND
2016-06-061606012-011.00 pCi/L
2016-07-191607024-01EURND
2016-08-041608013-01ND
2016-08-151608023-01EURND
2016-08-241608033-01EURND
2016-08-241608034-01EURND
2016-08-241608035-01EURND
2016-08-251608036-01EURND
2016-09-221609024-01EURND
2016-10-131610017-01EURND
2016-10-251610040-01EURND
2017-01-111701006-01EURND
2017-03-081703011-01RADND
2017-03-081703008-01RADND
2017-03-081703009-01RADND
2017-03-081703010-01RADND
2017-03-081703007-01RADND
2017-03-081703006-01RADND
2017-05-031705009-01EURND
2017-05-031705010-01EURND
2017-05-151705023-01EURND
2017-06-010.00 pCi/L*
2017-07-111707005-01EURND
2017-07-111707002-01EURND
2017-07-121707008-01EURND
2017-07-181707022-01EURND
2017-08-161708013-01EURND
2017-08-161708014-01EURND
2017-08-291708025-01EURND
2017-08-291708026-01EUR4.00 pCi/L
2017-08-291708027-01EURND
2017-10-101710018-01EURND
2017-10-101710017-01EURND
2017-10-251710031-01EURND
2017-10-251710036-01EURND
2017-10-251710029-01EURND
2017-10-251710033-01EURND
2017-10-251710034-01EURND
2017-10-251710032-01EURND
2017-10-301710045-01EURND
2017-10-301710043-01EURND
2017-10-311710058-01EURND
2017-10-311710049-01EURND
2017-10-311710053-01EURND
2017-10-311710055-01EURND
2017-10-311710052-01EURND
2017-10-311710054-01EURND
2017-11-011711007-01EURND
2017-11-301712007-01EURND
2017-12-051712023-01EURND

* Sample result is taken from the system's CCR report.