The Power of Information

National Drinking Water Database


Haystack Estates Utilities - Cambridge, MA


Serves 75 people

Alpha particle activity (incl. radon & uranium)

Alpha particles are a form of radiation associated with mining waste pollutants and natural sources.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
14 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)
14 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
22 days
Tests ConductedNumber of individual tests done for this contaminant
45 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Alpha particle activity (incl. radon & uranium)Alpha particles are a form of radiation associated with mining waste pollutants and natural sources.15.29 pCi/L
40.27 pCi/L
YesYes
15 pCi/L
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 Alpha particle activity (incl. radon & uranium)

Health Based Limits for Alpha particle activity (incl. radon & uranium)

StandardDescriptionLevel
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.15 pCi/L

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-2335 pCi/L306 to 51 pCi/L
2009-02-133.8 pCi/L103.8 pCi/L
2008-11-076.3 pCi/L106.3 pCi/L
2008-07-243.9 pCi/L103.9 pCi/L
2008-04-0440.27 pCi/L305.8 to 60 pCi/L
2008-01-245.2 pCi/L105.2 pCi/L
2007-11-305.5 pCi/L105.5 pCi/L
2007-08-024.1 pCi/L104.1 pCi/L
2007-05-097.3 pCi/L206.9 to 7.7 pCi/L
2007-02-1651.33 pCi/L+3043 to 57 pCi/L
2006-11-3036.97 pCi/L305.9 to 60 pCi/L
2006-08-101.33 pCi/L320 to 4 pCi/L
2006-05-2533.77 pCi/L302.3 to 50 pCi/L
2006-01-1969.67 pCi/L+3063 to 73 pCi/L
2005-10-1373.5 pCi/L+2068 to 79 pCi/L
2005-08-2576 pCi/L+2061 to 91 pCi/L
2005-05-1164 pCi/L+2054 to 74 pCi/L
2005-02-2371 pCi/L+2067 to 75 pCi/L
2004-10-1162 pCi/L+2060 to 64 pCi/L
2004-07-2848.5 pCi/L+2032 to 65 pCi/L
2004-04-2671 pCi/L+2066 to 76 pCi/L
2004-03-0253.5 pCi/L+2043 to 64 pCi/L