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water faucet

The following data comes from water samples collected at various locations around the State of Oregon. All of the samples are analyzed for cesium-137 and iodine-131 content. Data is updated on the website quarterly.

On this page:


Drinking Water

The following data was obtained from drinking water samples that were collected in Portland and at various locations along the  Oregon Coast. Samples are collected quarterly and are analyzed for cesium-137 and iodine-131 content. Data is updated on the website quarterly.

Data:

Drinking Water 2015
Archive 2014
Archive 2013
Archive 2012
Archive 2011

 

​Sample Date ​Location ​Cs-137 Activity (pCi/L) ​I-131 Activity (pCi/L)
02/10/2015​ ​Oswald West ​*<MDA *<MDA​
​02/13/2015 Harris Beach​ *<MDA​ *<MDA​
02/13/2015​ Seal Rock​ *<MDA​ *<MDA​
05/11/2015​ Harris Beach​ *<MDA​ *<MDA​
05/13/2015​ Oswald West​ *<MDA​ *<MDA​
05/15/2015​ Heceta Beach​ *<MDA​ *<MDA​
​08/14/2015 ​Fort Stevens *<MDA​ *<MDA​
​08/14/2015 ​Harris Beach *<MDA​ *<MDA​
​08/16/2015 ​Heceta Beach *<MDA​ *<MDA​
​09/02/2015 ​Portland *<MDA *<MDA​
  

*Minimum Detectable Activity (MDA):  The MDA is defined as the smallest quantity of radioactivity that can be distinguished from background radiation under specified conditions. 

Units: Picocurie (pCi): A unit of measurement that tells you the rate at which a sample of radioactive material decays.
1 pCi=0.037 Becquerel (Bq) = 2.22 disintegrations/minute. 


Rain Water
Rain water samples are collected in Portland on a continual basis and shipped to the EPA for further analysis. The analysis performed there can detect increases in radiation levels that would identify a potential threat to the public's health. Detailed test results by location can be seen on the EPA website
 

For a period of time after the Japanese nuclear reactors were damaged, RPS analyzed the rain samples collected in Portland, OR for gamma emitting radionuclides prior to shipping the samples to the EPA. The results from the analyses were periodically posted to the website. The results have continuously shown no elevated readings since May of 2011. As a result, RPS has chosen to discontinue posting these results.  Historical results obtained by RPS are listed below.  

 Data: 

Archive 2013
Archive 2012
Archive 2011 



Sea Water

The following data was obtained from sea water samples that were collected from various locations along the Oregon Coast.  Samples are collected quarterly and are analyzed for cesium-137 and iodine-131 content.  Data is updated on the website quarterly. 

Data:

Sea Water 2015
Archive 2014
Archive 2013
Archive 2012
Archive 2011

 
​Sample Date ​Location ​Cs-137 Activity (pCi/L) ​I-131 Activity (pCi/L)
02/10/2015​ ​Oswald West ​*<MDA *<MDA​
​02/13/2015 Harris Beach​ *<MDA​ *<MDA​
02/13/2015​ Seal Rock​ *<MDA​ *<MDA​
05/11/2015​ Harris Beach​ *<MDA​ *<MDA​
05/13/2015​ Oswald West​ *<MDA​ *<MDA​
05/15/2015​ Heceta Beach​ *<MDA​ *<MDA​
​08/14/2015 ​Fort Stevens *<MDA​ *<MDA​
​08/14/2015 ​Harris Beach *<MDA​ *<MDA​
​08/16/2015 ​Heceta Beach *<MDA​ *<MDA​​
 
 
*Minimum Detectable Activity (MDA):  The MDA is defined as the smallest quantity of radioactivity that can be distinguished from background radiation under specified conditions. 

Units: Picocurie (pCi): A unit of measurement that tells you the rate at which a sample of radioactive material decays.
1 pCi=0.037 Becquerel (Bq) = 2.22 disintegrations/minute.