EWG Tap Water Database 2009

	This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is	2 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)	2 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State	191 days
Tests ConductedNumber of individual tests done for this contaminant	429 tests

This Drinking Water System

Test Days Exceeding Health GuidelinesDefinition of what this is

2 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)

2 days

Test DaysNumber of days in which this chemical has reported results in the data we received from the State

191 days

Tests ConductedNumber of individual tests done for this contaminant

429 tests

Contaminant	Average/ Maximum Result	Health Limit Exceeded	Legal Limit Exceeded	Testing History -Tested -Detected -Over Health Guidelines -Over Legal Limit*
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.	9.86 ppb 170 ppb	Yes 100 ppb	Yes 100 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.

Contaminant

Average/
Maximum
Result

Health Limit
Exceeded

Legal Limit
Exceeded

Testing History

-Tested

-Detected

-Over Health Guidelines

-Over Legal Limit*

Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.

9.86 ppb
170 ppb

Yes
100 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.

Standard

Description

Level

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.

100 ppb

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.

100 ppb

Drinking Water Equivalent Level

A 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.

100 ppb

Children's health-based limit for 1-day exposure

Concentration 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.

1000 ppb

Children's health-based limit for 10-day exposure

Concentration 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.

1000 ppb

Testing Date

Average
Result

Samples taken that day

Number of Non-Detects

Range of Results

2009-04-02

0 ppb

2009-04-01

3.67 ppb

0 to 20 ppb

2009-03-02

0 ppb

2009-02-11

0 ppb

2009-02-02

3 ppb

2009-01-14

1.1 ppb

2009-01-06

4.36 ppb

0.99 to 7.4 ppb

2009-01-05

3.05 ppb

2.6 to 3.5 ppb

2008-12-23

13 ppb

2008-12-17

1.7 ppb

2008-12-01

2.3 ppb

2008-11-10

2.2 ppb

2008-10-28

6.2 ppb

2008-10-16

8.9 ppb

4.8 to 13 ppb

2008-10-15

1.77 ppb

1.1 to 2.6 ppb

2008-10-08

4.47 ppb

0.3 to 7.9 ppb

2008-10-06

3.1 ppb

2008-09-05

0.13 ppb

0 to 0.25 ppb

2008-09-03

3.9 ppb

2008-09-02

3.4 ppb

2.3 to 4.5 ppb

2008-08-13

4.5 ppb

2008-08-05

3.91 ppb

0.6 to 9.4 ppb

2008-08-04

2.3 ppb

2008-07-22

7.4 ppb

2008-07-15

14 ppb

2008-07-08

6.2 ppb

2008-07-02

1.99 ppb

0.88 to 3.1 ppb

2008-07-01

1.3 ppb

2008-06-17

14 ppb

2008-06-04

11 ppb

2008-06-02

2.7 ppb

2008-05-28

22.13 ppb

6.4 to 47 ppb

2008-05-14

140 ppb

2008-05-05

3.4 ppb

2008-05-01

20.23 ppb

3.8 to 52 ppb

2008-04-16

1.5 ppb

1.2 to 1.8 ppb

2008-04-08

0.44 ppb

0.38 to 0.5 ppb

2008-04-07

14 ppb

13 to 15 ppb

2008-04-02

6.92 ppb

0.47 to 22 ppb

2008-04-01

3.2 ppb

2.5 to 3.9 ppb

2008-03-26

13 ppb

2008-03-05

1.2 ppb

2008-03-04

0.31 ppb

2008-03-03

2.4 ppb

1.9 to 2.9 ppb

2008-02-26

1.45 ppb

1 to 1.9 ppb

2008-02-06

7.25 ppb

7 to 7.5 ppb

2008-02-04

3.2 ppb

2008-01-31

6.9 ppb

2008-01-24

1.1 ppb

2008-01-07

3.5 ppb

2008-01-02

1.2 ppb

2007-12-03

3.8 ppb

2007-11-20

1.65 ppb

1.1 to 2.2 ppb

2007-11-06

6 ppb

4 to 8 ppb

2007-10-17

0.35 ppb

0.29 to 0.4 ppb

2007-10-10

0.47 ppb

0.44 to 0.5 ppb

2007-10-09

10.02 ppb

1.8 to 27 ppb

2007-10-03

5.9 ppb

2007-10-02

8.95 ppb

1.5 to 23 ppb

2007-09-13

4.85 ppb

1.2 to 8.5 ppb

2007-09-12

2 ppb

2007-09-11

2.35 ppb

0.5 to 4.2 ppb

2007-09-05

5.3 ppb

2007-08-14

6 ppb

2007-07-17

0.95 ppb

2007-07-03

5.1 ppb

2007-06-13

170 ppb

2007-06-06

6.9 ppb

2007-05-03

10 ppb

2007-05-02

59.13 ppb

2.4 to 160 ppb

2007-05-01

6.9 ppb

2007-04-17

10 ppb

2007-04-12

5.1 ppb

2007-04-11

15.5 ppb

11 to 20 ppb

2007-04-06

3.92 ppb

0.63 to 7.2 ppb

2007-04-05

17.9 ppb

7.8 to 28 ppb

2007-04-04

8.69 ppb

0.53 to 31 ppb

2007-04-03

4.14 ppb

0.41 to 7.8 ppb

2007-03-28

1.5 ppb

1.1 to 1.9 ppb

2007-03-27

4.4 ppb

0.3 to 8 ppb

2007-03-06

6.6 ppb

2007-02-06

6.8 ppb

2007-01-23

92 ppb

2007-01-03

5.5 ppb

2006-12-12

1.2 ppb

2006-12-05

7.5 ppb

2006-11-07

6.4 ppb

2006-10-31

1.9 ppb

2006-10-26

0.82 ppb

0.69 to 1 ppb

2006-10-25

16.07 ppb

5.2 to 27 ppb

2006-10-18

21.03 ppb

9.1 to 37 ppb

2006-10-12

31 ppb

23 to 39 ppb

2006-10-11

15.3 ppb

7.6 to 23 ppb

2006-10-10

13.6 ppb

2.2 to 25 ppb

2006-10-04

5.94 ppb

0.34 to 12 ppb

2006-10-03

6.74 ppb

4.2 to 9.7 ppb

2006-09-06

5.8 ppb

2006-08-02

6.2 ppb

2006-07-05

7.8 ppb

2006-06-13

0.63 ppb

2006-06-07

7.3 ppb

2006-05-10

4.66 ppb

0.32 to 9 ppb

2006-05-09

15 ppb

2006-05-03

18 ppb

2006-05-02

6.5 ppb

2006-04-24

0.41 ppb

2006-04-19

18.59 ppb

4.2 to 43 ppb

2006-04-11

5.7 ppb

2006-04-07

9.65 ppb

3.3 to 16 ppb

2006-04-05

10.03 ppb

7.1 to 12 ppb

2006-04-04

5.6 ppb

2006-03-01

5.7 ppb

2006-02-01

15.5 ppb

6 to 25 ppb

2006-01-04

5.5 ppb

2005-12-13

34 ppb

2005-12-06

5.7 ppb

2005-11-02

5.6 ppb

2005-10-27

7.9 ppb

6.5 to 9.3 ppb

2005-10-26

20.65 ppb

5.3 to 36 ppb

2005-10-20

11.65 ppb

8.3 to 15 ppb

2005-10-11

11.57 ppb

3.4 to 23 ppb

2005-10-05

7.74 ppb

6.9 to 9.7 ppb

2005-10-04

4 ppb

2005-09-27

40 ppb

2005-09-21

4.1 ppb

2005-09-06

4.5 ppb

2005-08-25

2.2 ppb

2005-08-17

3.54 ppb

0.61 to 8.9 ppb

2005-08-11

9.83 ppb

6.4 to 16 ppb

2005-08-10

5.55 ppb

3.4 to 7.7 ppb

2005-08-03

4.85 ppb

0.3 to 8.1 ppb

2005-08-02

0 ppb

2005-07-26

0 ppb

2005-07-25

9.5 ppb

2005-07-19

19 ppb

2005-07-13

0 ppb

2005-07-05

26.65 ppb

5.3 to 48 ppb

2005-06-29

0 ppb

2005-06-16

6.6 ppb

2005-06-08

0.16 ppb

0 to 0.81 ppb

2005-06-07

5.4 ppb

2005-06-02

13.25 ppb

0 to 53 ppb

2005-05-26

24 ppb

6 to 42 ppb

2005-05-24

0.37 ppb

0 to 1.1 ppb

2005-05-19

0 ppb

2005-05-10

0 ppb

2005-05-05

19.7 ppb

5.2 to 48 ppb

2005-05-04

2.21 ppb

0.28 to 5.4 ppb

2005-05-03

0 ppb

2005-04-28

0 ppb

2005-04-26

0.29 ppb

2005-04-25

3.03 ppb

1.8 to 5.3 ppb

2005-04-19

4.67 ppb

0 to 14 ppb

2005-04-14

7.32 ppb

4.1 to 13 ppb

2005-04-12

8.17 ppb

0 to 16 ppb

2005-04-06

68 ppb

2005-04-05

3.8 ppb

2005-03-24

0.67 ppb

0.55 to 0.79 ppb

2005-03-03

6.6 ppb

2005-03-02

1.63 ppb

0 to 9.8 ppb

2005-02-24

29.5 ppb

6 to 53 ppb

2005-02-16

8.23 ppb

7.5 to 8.7 ppb

2005-02-03

0 ppb

2005-01-27

26.5 ppb

5 to 48 ppb

2005-01-05

0 ppb

2004-12-21

34.7 ppb

5.4 to 64 ppb

2004-12-15

0 ppb

2004-12-01

0 ppb

2004-11-18

34.35 ppb

5.7 to 63 ppb

2004-11-17

0 ppb

2004-11-10

0 ppb

2004-11-03

0 ppb

2004-10-28

42.65 ppb

4.3 to 81 ppb

2004-10-25

0 ppb

2004-10-20

0 ppb

2004-09-30

70 ppb

2004-09-29

3 ppb

2004-08-25

4.7 ppb

2004-07-29

4.6 ppb

2004-06-23

4.1 ppb

2004-05-26

5.3 ppb

2004-05-13

2.1 ppb

0 to 4.2 ppb

2004-04-28

2.7 ppb

2004-04-21

3.55 ppb

0 to 11 ppb

2004-04-14

5.59 ppb

0 to 13 ppb

2004-04-08

7.13 ppb

6.2 to 7.9 ppb

2004-04-07

2.81 ppb

0 to 10 ppb

2004-03-24

5.4 ppb

2004-03-03

0 ppb

2004-02-26

4.6 ppb

2004-01-29

3.7 ppb

National Drinking Water Database

Pomona - City, Water Dept. Utilities - Los Angeles, CA

Chromium (total)

Testing Summary

Testing History

Health Based and Legal Limits for Chromium (total)

Health Based Limits for Chromium (total)

Testing Results

Health/Toxics

Farming

Natural Resources

Energy Choices