1,4-Dioxane
Goleta Water District
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 | 0.00588 ppb | 17 | 1 | ND - 0.1000 ppb |
| 2015 | ND | 4 | 0 | ND |
| 2016 | 15.0 ppb | 1 | 1 | 15.0 ppb |
| 2017 | 9.91 ppb | 20 | 16 | ND - 16.0 ppb |
| 2018 | 5.93 ppb | 12 | 7 | ND - 16.0 ppb |
| 2019 | 5.98 ppb | 17 | 12 | ND - 14.0 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 |
|---|---|---|
| 2014-01-28 | 4A29021-05A | ND |
| 2014-01-28 | 4A29021-07A | ND |
| 2014-01-28 | 4A29021-01A | ND |
| 2014-01-28 | 4A29021-03A | ND |
| 2014-02-12 | 4B13092-01A | ND |
| 2014-03-13 | 4C14053-01A | ND |
| 2014-04-28 | 4D29011-01A | ND |
| 2014-06-18 | 4F19088-01A | 0.1000 ppb |
| 2014-07-17 | 4G18046-01A | ND |
| 2014-07-17 | 4G18046-13A | ND |
| 2014-07-17 | 4G18046-11A | ND |
| 2014-07-17 | 4G18046-09A | ND |
| 2014-07-17 | 4G18046-05A | ND |
| 2014-09-15 | 4I17055-01A | ND |
| 2014-10-20 | 4J21040-01A | ND |
| 2014-10-30 | 4J31032-01A | ND |
| 2014-12-04 | 4L05054-01A | ND |
| 2015-01-05 | 5A06071-01A | ND |
| 2015-01-27 | 5A28011-05A | ND |
| 2015-01-27 | 5A28011-01A | ND |
| 2015-02-12 | 9590-001-1242 | ND |
| 2016-12-01 | 2920-001-1045 | 15.0 ppb |
| 2017-01-05 | 9590-001-1130 | 12.0 ppb |
| 2017-01-26 | 9590-001-0845 | 14.0 ppb |
| 2017-01-26 | 9590-001-1300 | 13.0 ppb |
| 2017-02-09 | 9590-001-1240 | 16.0 ppb |
| 2017-03-06 | 9590-001-0933 | 16.0 ppb |
| 2017-07-26 | 9590-001-1445 | ND |
| 2017-08-02 | 9590-001-1220 | ND |
| 2017-08-02 | 9590-001-1310 | ND |
| 2017-08-02 | 9590-001-1410 | ND |
| 2017-08-02 | 9590-001-1510 | 2.80 ppb |
| 2017-08-03 | 9590-001-1000 | 11.0 ppb |
| 2017-08-04 | 9590-001-1210 | 12.0 ppb |
| 2017-08-05 | 9590-001-1120 | 12.0 ppb |
| 2017-08-06 | 9590-001-1055 | 14.0 ppb |
| 2017-08-07 | 9590-001-1030 | 14.0 ppb |
| 2017-08-08 | 9590-001-1030 | 13.0 ppb |
| 2017-08-10 | 9590-001-0930 | 13.0 ppb |
| 2017-08-23 | 9590-001-0840 | 15.0 ppb |
| 2017-08-25 | 9590-001-1040 | 15.0 ppb |
| 2017-12-21 | 9590-001-1150 | 5.30 ppb |
| 2018-02-01 | 9590-001-1141 | 14.0 ppb |
| 2018-02-28 | 9590-001-1340 | 16.0 ppb |
| 2018-03-29 | 9590-001-1115 | 15.0 ppb |
| 2018-05-22 | 9590-001-1130 | 13.0 ppb |
| 2018-06-20 | 9590-033-1020 | ND |
| 2018-06-20 | 9590-034-0950 | ND |
| 2018-06-20 | 9590-001-0825 | 1.000 ppb |
| 2018-06-20 | 9590-031-0925 | ND |
| 2018-06-20 | 9590-018-0855 | ND |
| 2018-10-17 | 9590-001-0925 | ND |
| 2018-11-30 | 9590-001-1149 | 1.20 ppb |
| 2018-12-20 | 9590-001-0850 | 11.0 ppb |
| 2019-01-08 | 9590-001-1152 | 14.0 ppb |
| 2019-02-21 | 9590-001-0950 | 11.0 ppb |
| 2019-03-15 | 9590-001-0920 | 11.0 ppb |
| 2019-04-24 | 9590-001-1052 | 9.20 ppb |
| 2019-05-16 | 9588-001-0000 | 12.0 ppb |
| 2019-06-25 | 9588-001-1022 | 1.60 ppb |
| 2019-07-16 | 9588-001-1055 | 1.60 ppb |
| 2019-08-15 | 9590-001-1130 | 1.60 ppb |
| 2019-09-05 | 9590-001-0835 | 8.80 ppb |
| 2019-09-05 | 9590-035-0850 | ND |
| 2019-09-05 | 9590-034-0845 | ND |
| 2019-09-13 | 9590-032-0900 | ND |
| 2019-09-17 | 9590-033-1015 | ND |
| 2019-09-20 | 9590-031-0858 | ND |
| 2019-10-23 | 9590-001-0825 | 8.90 ppb |
| 2019-11-14 | 9590-001-0920 | 11.0 ppb |
| 2019-12-13 | 9590-001-1100 | 11.0 ppb |