The Power of Information

National Drinking Water Database


Cherry Valley & Rochdale Water District Utilities - Worcester, MA


Serves 4,500 people

Chlorite

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide, or from the use of chlorine dioxide as a bleaching agent for cellulose, paper pulp, flour and oils.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
0 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
54 days
Tests ConductedNumber of individual tests done for this contaminant
158 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ChloriteChlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide, or from the use of chlorine dioxide as a bleaching agent for cellulose, paper pulp, flour and oils.109.62 ppb
533.33 ppb
No
800 ppb
No
1000 ppb
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 Chlorite

Health Based Limits for Chlorite

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.800 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.800 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
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.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-05-14114.33 ppb3093 to 140 ppb
2009-02-110 ppb330 ppb
2008-11-19196.67 ppb30130 to 270 ppb
2008-08-1380 ppb3042 to 100 ppb
2008-01-16390 ppb30130 to 520 ppb
2007-12-12213.33 ppb30160 to 280 ppb
2007-11-14108.33 ppb3087 to 140 ppb
2007-10-31533.33 ppb30120 to 880 ppb
2007-09-19141 ppb3087 to 240 ppb
2007-08-159 ppb310 to 14 ppb
2007-07-1842.33 ppb310 to 79 ppb
2007-06-20113.33 ppb30110 to 120 ppb
2007-05-1676.33 ppb3014 to 150 ppb
2007-04-1883 ppb3039 to 110 ppb
2007-03-2135.33 ppb310 to 53 ppb
2007-02-21101 ppb3081 to 140 ppb
2007-01-17210 ppb30150 to 260 ppb
2006-12-13290 ppb30190 to 410 ppb
2006-11-1568.67 ppb3052 to 77 ppb
2006-10-18120.67 ppb3032 to 190 ppb
2006-09-27115.67 ppb3047 to 180 ppb
2006-08-165 ppb320 to 15 ppb
2006-07-210 ppb330 ppb
2006-06-2125.33 ppb3016 to 41 ppb
2006-05-17106.67 ppb320 to 320 ppb
2006-04-20213.33 ppb30100 to 270 ppb
2006-03-15136 ppb3041 to 310 ppb
2006-02-15264.67 ppb310 to 710 ppb
2006-01-18123 ppb410 to 340 ppb
2005-12-21190 ppb310 to 310 ppb
2005-11-16233.33 ppb310 to 370 ppb
2005-10-19156.67 ppb310 to 260 ppb
2005-09-210 ppb330 ppb
2005-08-176 ppb320 to 18 ppb
2005-07-200 ppb330 ppb
2005-06-154 ppb320 to 12 ppb
2005-05-1847.67 ppb310 to 78 ppb
2005-04-2047 ppb3019 to 78 ppb
2005-03-1625.33 ppb320 to 76 ppb
2005-02-1621.67 ppb310 to 37 ppb
2005-01-2179 ppb310 to 200 ppb
2004-12-1549.67 ppb310 to 75 ppb
2004-11-1720.67 ppb310 to 38 ppb
2004-10-200 ppb330 ppb
2004-09-1519 ppb310 to 44 ppb
2004-08-1886.67 ppb310 to 150 ppb
2004-08-08150 ppb10150 ppb
2004-07-2152.33 ppb3032 to 63 ppb
2004-06-1671.33 ppb3018 to 140 ppb
2004-05-19140 ppb10140 ppb
2004-04-21230 ppb20120 to 340 ppb
2004-03-1653 ppb310 to 140 ppb
2004-02-1896.67 ppb310 to 230 ppb
2004-01-21223.33 ppb30120 to 310 ppb