1,4-Dioxane
Compton Water Department
1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff. Read More.
Animal studies show that 1,4-dioxane can target the liver, kidneys and respiratory system, and that prenatal exposure can harm the developing fetus. The State of California has set a Public Heatlh Goal of no more than 1 part per billion of 1,4-dioxane in drinking water. The state of Massachusetts sets a legal limit of 0.3 ppb, and New Hampshire's limit is 3 parts per billion. There is no national drinking water standard for this contaminant.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 1.53 ppb | 10 | 9 | ND - 3.80 ppb |
| 2015 | 1.06 ppb | 14 | 9 | ND - 3.10 ppb |
| 2016 | 1.76 ppb | 8 | 7 | ND - 3.30 ppb |
| 2017 | 1.23 ppb | 6 | 5 | ND - 1.60 ppb |
| 2018 | 1.58 ppb | 9 | 8 | ND - 2.50 ppb |
| 2019 | 1.70 ppb | 5 | 5 | 1.40 ppb - 2.40 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.35 ppb
The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-13 | 9588-014-1020 | ND |
| 2014-01-13 | 9588-019-1105 | 1.40 ppb |
| 2014-01-21 | 9588-019-0850 | 1.10 ppb |
| 2014-04-17 | 9588-014-1054 | 1.30 ppb |
| 2014-04-29 | 9588-014-1100 | 1.30 ppb |
| 2014-06-26 | 9588-019-1148 | 1.60 ppb |
| 2014-07-29 | 9588-019-0946 | 1.60 ppb |
| 2014-07-29 | 9588-014-1003 | 1.20 ppb |
| 2014-10-31 | 9588-014-1019 | 3.80 ppb |
| 2014-11-07 | 9588-019-1018 | 2.00 ppb |
| 2015-01-29 | 9588-019-1014 | 1.60 ppb |
| 2015-01-29 | 9588-014-1103 | 3.10 ppb |
| 2015-02-10 | 5B10093-07A | ND |
| 2015-02-10 | 5B10093-01A | ND |
| 2015-02-10 | 5B10093-05A | ND |
| 2015-02-10 | 5B10093-03A | 1.30 ppb |
| 2015-02-26 | 5B26014-03A | ND |
| 2015-02-26 | 5B26014-01A | ND |
| 2015-04-16 | 9588-014-1055 | 1.50 ppb |
| 2015-04-16 | 9588-019-0940 | 1.60 ppb |
| 2015-07-24 | 9588-014-1305 | 1.30 ppb |
| 2015-07-24 | 9588-019-1107 | 1.60 ppb |
| 2015-10-22 | 9588-014-0951 | 1.70 ppb |
| 2015-10-22 | 9588-019-0938 | 1.20 ppb |
| 2016-01-27 | 9588-019-1057 | 1.60 ppb |
| 2016-01-27 | 9588-014-1125 | 2.00 ppb |
| 2016-04-28 | 9588-019-1110 | 1.90 ppb |
| 2016-04-28 | 9588-014-1120 | 1.50 ppb |
| 2016-07-15 | 9588-019-1048 | 1.60 ppb |
| 2016-07-15 | 9588-014-1036 | 3.30 ppb |
| 2016-10-05 | 9588-019-1125 | 2.20 ppb |
| 2016-10-05 | 9588-014-1202 | ND |
| 2017-01-24 | 9588-019-1043 | 1.40 ppb |
| 2017-01-24 | 9588-014-1110 | ND |
| 2017-04-26 | 9588-019-1035 | 1.50 ppb |
| 2017-04-26 | 9588-014-1120 | 1.60 ppb |
| 2017-07-18 | 9588-019-1035 | 1.60 ppb |
| 2017-10-05 | 9588-019-1020 | 1.30 ppb |
| 2018-01-09 | 9588-019-1001 | 1.70 ppb |
| 2018-04-12 | 9588-019-1110 | 1.30 ppb |
| 2018-04-12 | 9588-015-1040 | ND |
| 2018-06-28 | 9588-014-1015 | 2.20 ppb |
| 2018-07-23 | 9588-019-0955 | 1.90 ppb |
| 2018-09-27 | 9588-014-1014 | 1.20 ppb |
| 2018-10-25 | 9588-019-1125 | 1.90 ppb |
| 2018-11-08 | 9588-019-1110 | 1.50 ppb |
| 2018-12-19 | 9588-014-1000 | 2.50 ppb |
| 2019-01-30 | 9588-014-1205 | 2.40 ppb |
| 2019-01-30 | 9588-019-0945 | 1.70 ppb |
| 2019-04-25 | 9588-019-1013 | 1.50 ppb |
| 2019-07-17 | 9588-019-0930 | 1.50 ppb |
| 2019-10-18 | 9588-019-1015 | 1.40 ppb |