EWG Tap Water Database 2009

	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	13 days
Tests ConductedNumber of individual tests done for this contaminant	39 tests

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

13 days

Tests ConductedNumber of individual tests done for this contaminant

39 tests

Contaminant	Average/ Maximum Result	Health Limit Exceeded	Legal Limit Exceeded	Testing History -Tested -Detected -Over Health Guidelines -Over Legal Limit*
2,2,4,4,5,6-hexachlorobiphenyl2,2,4,4,5,6-hexachlorobiphenyl is a member of the polychlorinated biphenyl (PCB) group of industrial chemicals used as dielectrics, coolants and lubricants in electrical equipment. PCBs contaminate water by leaching from landfills or other waste deposits.	0 ppb 0 ppb	No	Legal 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.

Contaminant

Average/
Maximum
Result

Health Limit
Exceeded

Legal Limit
Exceeded

Testing History

-Tested

-Detected

-Over Health Guidelines

-Over Legal Limit*

2,2,4,4,5,6-hexachlorobiphenyl2,2,4,4,5,6-hexachlorobiphenyl is a member of the polychlorinated biphenyl (PCB) group of industrial chemicals used as dielectrics, coolants and lubricants in electrical equipment. PCBs contaminate water by leaching from landfills or other waste deposits.

0 ppb
0 ppb

Legal 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.

Testing Date

Average
Result

Samples taken that day

Number of Non-Detects

Range of Results

2007-04-26

0 ppb

2006-02-21

0 ppb

2006-02-15

0 ppb

2005-12-19

0 ppb

2005-07-27

0 ppb

2005-05-05

0 ppb

2005-05-04

0 ppb

2005-04-13

0 ppb

2005-01-26

0 ppb

2004-01-28

0 ppb

2004-01-27

0 ppb

2004-01-14

0 ppb

2004-01-13

0 ppb

National Drinking Water Database

City of Houston Public Works Utilities - Houston, TX

2,2,4,4,5,6-hexachlorobiphenyl

Testing Summary

Testing History

Health Based and Legal Limits for 2,2,4,4,5,6-hexachlorobiphenyl

Health Based Limits for 2,2,4,4,5,6-hexachlorobiphenyl

Testing Results

Health/Toxics

Farming

Natural Resources

Energy Choices