The Power of Information

National Drinking Water Database

Dcwa Central Utilities - Ammon, VA

Serves 7,431 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
28 days
Tests ConductedNumber of individual tests done for this contaminant
81 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.162.88 ppb
518.33 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
2009-01-1497.53 ppb3093.9 to 104 ppb
2008-10-07123.33 ppb30101 to 159 ppb
2008-07-0793.53 ppb3082.3 to 110 ppb
2008-04-07102.13 ppb3085.5 to 125 ppb
2008-01-07153.33 ppb30136 to 183 ppb
2006-10-11207.67 ppb30202 to 217 ppb
2006-07-18171.67 ppb30135 to 230 ppb
2006-06-14166.67 ppb30134 to 228 ppb
2006-03-15125 ppb30114 to 145 ppb
2005-12-19135.63 ppb3097.9 to 188 ppb
2005-09-27210 ppb10210 ppb
2005-09-19250.5 ppb20206 to 295 ppb
2005-06-27185.67 ppb30147 to 207 ppb
2005-03-17246.33 ppb30109 to 402 ppb
2005-02-16199.33 ppb30146 to 237 ppb
2005-01-25173.33 ppb30139 to 241 ppb
2004-12-15170.67 ppb30132 to 226 ppb
2004-11-22209.33 ppb30145 to 262 ppb
2004-10-19185 ppb30161 to 201 ppb
2004-09-21160.67 ppb30126 to 200 ppb
2004-08-25139.33 ppb30123 to 165 ppb
2004-07-22129 ppb30100 to 155 ppb
2004-06-21518.33 ppb3076 to 1125 ppb
2004-05-1234.33 ppb320 to 103 ppb
2004-04-2058.83 ppb3055.4 to 61 ppb
2004-03-2490.67 ppb3062.3 to 142 ppb
2004-02-2594.63 ppb3048.4 to 152 ppb
2004-01-28128.07 ppb3094.2 to 161 ppb