The Power of Information

National Drinking Water Database


Cherry Valley & Rochdale Water District Utilities - Worcester, MA


Serves 4,500 people

Radon

Radon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
16 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
16 days
Tests ConductedNumber of individual tests done for this contaminant
34 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
RadonRadon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater.1832.71 pCi/L
10320 pCi/L
Yes
1.5 pCi/L
Legal at any levelThis is the Federal Limit. State Limits may be lower.
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Radon

Health Based Limits for Radon

StandardDescriptionLevel
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.1.5 pCi/L
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.150 pCi/L

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-02-112015 pCi/L20730 to 3300 pCi/L
2008-11-191005 pCi/L20410 to 1600 pCi/L
2008-08-135665 pCi/L201830 to 9500 pCi/L
2008-05-142050 pCi/L201000 to 3100 pCi/L
2008-02-191105 pCi/L20410 to 1800 pCi/L
2007-11-14720 pCi/L20240 to 1200 pCi/L
2007-09-1910320 pCi/L30120 to 30000 pCi/L
2007-06-20485 pCi/L20170 to 800 pCi/L
2007-03-21515 pCi/L20180 to 850 pCi/L
2006-11-15460 pCi/L20150 to 770 pCi/L
2006-09-20575 pCi/L20170 to 980 pCi/L
2006-06-21230 pCi/L210 to 460 pCi/L
2006-03-15440 pCi/L20120 to 760 pCi/L
2005-12-21425 pCi/L20190 to 660 pCi/L
2005-09-213103.33 pCi/L310 to 9200 pCi/L
2005-06-15210 pCi/L210 to 420 pCi/L