The Power of Information

National Drinking Water Database


City of Petersburg Utilities - Petersburg, VA


Serves 33,740 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
26 days
Tests ConductedNumber of individual tests done for this contaminant
77 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.359.5 ppb
646.67 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
2009-04-16183.67 ppb30149 to 208 ppb
2009-01-14315.67 ppb30249 to 359 ppb
2008-10-14311.67 ppb30124 to 598 ppb
2008-07-1659.7 ppb3028.3 to 100 ppb
2008-04-10167.67 ppb30161 to 172 ppb
2008-01-17256.33 ppb30243 to 270 ppb
2006-10-11459.67 ppb30289 to 558 ppb
2006-07-1217.33 ppb310 to 38.4 ppb
2006-04-11104.47 ppb3092.2 to 122 ppb
2006-01-11602 ppb30592 to 609 ppb
2005-10-05346 ppb30295 to 378 ppb
2005-07-13556.33 ppb30255 to 726 ppb
2005-04-14453 ppb30379 to 514 ppb
2005-01-12545 ppb30531 to 570 ppb
2004-12-15409.32 ppb305.96 to 615 ppb
2004-11-09528.67 ppb30482 to 555 ppb
2004-10-06420.67 ppb30365 to 493 ppb
2004-09-21526 ppb30458 to 575 ppb
2004-08-18646.67 ppb30450 to 788 ppb
2004-07-13245 ppb30182 to 305 ppb
2004-06-1557.47 ppb3046.9 to 68.7 ppb
2004-05-1293.5 ppb210 to 187 ppb
2004-04-15241 ppb30206 to 293 ppb
2004-03-10637 ppb30446 to 995 ppb
2004-02-12566.33 ppb30480 to 622 ppb
2004-01-29597 ppb30410 to 719 ppb