The Power of Information

National Drinking Water Database


California Water Service Co. - Ela Utilities - Los Angeles, CA


Serves 151,042 people

1,4-Dioxane

1,4-Dioxane is a stabilizing chemical in industrial solvents and an emerging groundwater pollutant from solvent recycling and plastic manufacturing; it is a probable human carcinogen.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
41 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
60 days
Tests ConductedNumber of individual tests done for this contaminant
166 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
1,4-Dioxane1,4-Dioxane is a stabilizing chemical in industrial solvents and an emerging groundwater pollutant from solvent recycling and plastic manufacturing; it is a probable human carcinogen.4.04 ppb
8 ppb
Yes
3 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.

Health Based and Legal Limits for 1,4-Dioxane

Health Based Limits for 1,4-Dioxane

StandardDescriptionLevel
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.3 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.300 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.400 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.4000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-02-053.95 ppb410 to 6.56 ppb
2009-01-086.64 ppb106.64 ppb
2008-12-023.85 ppb203.7 to 4 ppb
2008-11-123.6 ppb610 to 5.1 ppb
2008-10-094.97 ppb304.8 to 5.1 ppb
2008-09-045.45 ppb205.2 to 5.7 ppb
2008-08-053.88 ppb610 to 5.7 ppb
2008-06-023.95 ppb203.7 to 4.2 ppb
2008-05-072.25 ppb630 to 6 ppb
2008-04-106.23 ppb305.6 to 6.7 ppb
2008-03-067.95 ppb207.4 to 8.5 ppb
2008-02-052.58 ppb620 to 4.5 ppb
2008-01-105.9 ppb305.7 to 6.3 ppb
2007-12-135.45 ppb205.3 to 5.6 ppb
2007-11-014.28 ppb610 to 6.03 ppb
2007-09-126.15 ppb206.1 to 6.2 ppb
2007-08-092.05 ppb630 to 4.5 ppb
2007-07-105.1 ppb304.6 to 5.4 ppb
2007-06-194.5 ppb204.4 to 4.6 ppb
2007-06-184.95 ppb204.8 to 5.1 ppb
2007-06-054.4 ppb203.9 to 4.9 ppb
2007-05-112.4 ppb210 to 4.8 ppb
2007-05-101.7 ppb210 to 3.4 ppb
2007-05-082.15 ppb420 to 5.3 ppb
2007-04-166 ppb106 ppb
2007-02-162.53 ppb410 to 4.1 ppb
2007-01-175.93 ppb305.6 to 6.1 ppb
2006-11-092.9 ppb210 to 5.79 ppb
2006-10-306.1 ppb106.1 ppb
2006-10-195.2 ppb403.6 to 6.8 ppb
2006-08-103.1 ppb210 to 6.2 ppb
2006-07-274.98 ppb403.9 to 6.7 ppb
2006-07-250 ppb110 ppb
2006-05-112.33 ppb320 to 7 ppb
2006-04-183.2 ppb203.2 ppb
2006-04-045.55 ppb403.7 to 6.8 ppb
2006-02-067.6 ppb107.6 ppb
2006-02-020 ppb110 ppb
2006-01-195.67 ppb604 to 8.3 ppb
2006-01-116.4 ppb106.4 ppb
2005-12-110 ppb110 ppb
2005-11-090 ppb220 ppb
2005-10-313.8 ppb103.8 ppb
2005-10-126.53 ppb410 to 9.7 ppb
2005-08-256 ppb106 ppb
2005-08-110 ppb220 ppb
2005-07-273.5 ppb103.5 ppb
2005-07-215.23 ppb410 to 8.1 ppb
2005-05-038 ppb108 ppb
2005-04-055.75 ppb410 to 9 ppb
2005-02-022.53 ppb320 to 7.6 ppb
2005-01-196.2 ppb410 to 10 ppb
2004-11-095.26 ppb520 to 9.8 ppb
2004-10-193.6 ppb103.6 ppb
2004-10-072.6 ppb210 to 5.2 ppb
2004-07-131.03 ppb320 to 3.1 ppb
2004-06-286.86 ppb510 to 10.5 ppb
2004-06-270 ppb110 ppb
2004-06-153.8 ppb103.8 ppb
2004-06-140 ppb110 ppb