The Power of Information

National Drinking Water Database

Henrico County Public Utilities Utilities - Richmond, VA

Serves 289,000 people


Chlorate is a disinfection byproduct (unregulated chlorine dioxide byproduct), an herbicide and a pollutant from explosives.
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
49 days
Tests ConductedNumber of individual tests done for this contaminant
49 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ChlorateChlorate is a disinfection byproduct (unregulated chlorine dioxide byproduct), an herbicide and a pollutant from explosives.419.68 ppb
1062 ppb
NoLegal 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 Chlorate

Health Based Limits for Chlorate

There are no health based standards that EWG is using for this chemical

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-08233 ppb10233 ppb
2009-03-11263 ppb10263 ppb
2009-02-11167 ppb10167 ppb
2009-01-14410 ppb10410 ppb
2008-12-10285 ppb10285 ppb
2008-11-12260 ppb10260 ppb
2008-10-08653 ppb10653 ppb
2008-09-10674 ppb10674 ppb
2008-08-13381 ppb10381 ppb
2008-07-09487 ppb10487 ppb
2008-06-11517 ppb10517 ppb
2008-05-14365 ppb10365 ppb
2008-04-09430 ppb10430 ppb
2008-03-12316 ppb10316 ppb
2008-02-13230 ppb10230 ppb
2008-01-09369 ppb10369 ppb
2006-12-13540 ppb10540 ppb
2006-11-08128 ppb10128 ppb
2006-10-11564 ppb10564 ppb
2006-09-13246 ppb10246 ppb
2006-08-09293 ppb10293 ppb
2006-07-12477 ppb10477 ppb
2006-06-14249 ppb10249 ppb
2006-05-10272 ppb10272 ppb
2006-04-12373 ppb10373 ppb
2006-03-08280 ppb10280 ppb
2006-02-08298 ppb10298 ppb
2006-01-11471 ppb10471 ppb
2005-12-14344 ppb10344 ppb
2005-11-09492 ppb10492 ppb
2005-10-12348 ppb10348 ppb
2005-09-14430 ppb10430 ppb
2005-08-10467 ppb10467 ppb
2005-07-13695 ppb10695 ppb
2005-06-08497 ppb10497 ppb
2005-05-11470 ppb10470 ppb
2005-04-13480 ppb10480 ppb
2005-03-09709 ppb10709 ppb
2005-02-09395 ppb10395 ppb
2005-01-12408 ppb10408 ppb
2004-12-08427 ppb10427 ppb
2004-11-10566 ppb10566 ppb
2004-10-13568 ppb10568 ppb
2004-09-081062 ppb101062 ppb
2004-08-11706 ppb10706 ppb
2004-07-14665 ppb10665 ppb
2004-06-090 ppb110 ppb
2004-05-13557 ppb10557 ppb
2004-04-2847.2 ppb1047.2 ppb