1,4-Dioxane
Suburban Water Systems - Whittier
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 |
|---|---|---|---|---|
| 2013 | 0.465 ppb | 2 | 2 | 0.430 ppb - 0.500 ppb |
| 2014 | 0.0520 ppb | 20 | 2 | ND - 0.540 ppb |
| 2015 | 0.0458 ppb | 24 | 1 | ND - 1.10 ppb |
| 2016 | ND | 23 | 0 | ND |
| 2017 | ND | 16 | 0 | ND |
| 2018 | ND | 16 | 0 | ND |
| 2019 | ND | 16 | 0 | ND |
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 |
|---|---|---|
| 2013-10-21 | 3J21021-03A | 0.430 ppb |
| 2013-10-21 | 3J21021-01A | 0.500 ppb |
| 2014-01-09 | 9588-014-1520 | ND |
| 2014-02-06 | 9588-014-1020 | ND |
| 2014-03-10 | 9588-014-1501 | ND |
| 2014-04-07 | 9588-014-1304 | ND |
| 2014-04-17 | 4D17051-03A | 0.500 ppb |
| 2014-04-17 | 4D17051-01A | 0.540 ppb |
| 2014-05-12 | 9588-014-1106 | ND |
| 2014-05-19 | 9588-020-1010 | ND |
| 2014-05-19 | 9588-031-0915 | ND |
| 2014-05-19 | 9588-033-0925 | ND |
| 2014-05-19 | 9588-035-0900 | ND |
| 2014-06-16 | 9588-014-1400 | ND |
| 2014-07-07 | 9588-014-1118 | ND |
| 2014-08-04 | 9588-014-1305 | ND |
| 2014-09-10 | 9588-014-1315 | ND |
| 2014-10-16 | 9588-014-1140 | ND |
| 2014-11-11 | 9588-020-0950 | ND |
| 2014-11-11 | 9588-031-1110 | ND |
| 2014-11-11 | 9588-035-1125 | ND |
| 2014-12-08 | 9588-033-1150 | ND |
| 2015-02-17 | 9588-020-1130 | ND |
| 2015-02-17 | 9588-031-1140 | ND |
| 2015-02-17 | 9588-033-1145 | ND |
| 2015-02-17 | 9588-035-1200 | ND |
| 2015-03-13 | 9588-014-1105 | ND |
| 2015-04-23 | 9588-014-0950 | ND |
| 2015-05-22 | 9588-020-1000 | ND |
| 2015-05-22 | 9588-031-0930 | ND |
| 2015-05-22 | 9588-035-0920 | ND |
| 2015-06-17 | 9588-033-0855 | ND |
| 2015-07-30 | 9588-014-1031 | ND |
| 2015-08-13 | 9588-014-1012 | ND |
| 2015-08-18 | 9588-020-0855 | ND |
| 2015-08-18 | 9588-031-0900 | ND |
| 2015-08-18 | 9588-033-0845 | ND |
| 2015-08-18 | 9588-035-0915 | 1.10 ppb |
| 2015-09-02 | 9588-014-1108 | ND |
| 2015-10-08 | 9588-014-1128 | ND |
| 2015-11-09 | 9588-014-0850 | ND |
| 2015-11-09 | 9588-020-0915 | ND |
| 2015-11-09 | 9588-031-0920 | ND |
| 2015-11-09 | 9588-033-0910 | ND |
| 2015-11-09 | 9588-035-0950 | ND |
| 2015-12-07 | 9588-014-1040 | ND |
| 2016-02-24 | 9588-020-0830 | ND |
| 2016-02-24 | 9588-031-0850 | ND |
| 2016-02-24 | 9588-033-0840 | ND |
| 2016-02-24 | 9588-035-0910 | ND |
| 2016-04-29 | 9588-014-1001 | ND |
| 2016-05-05 | 9588-014-1000 | ND |
| 2016-05-24 | 9588-020-1005 | ND |
| 2016-05-24 | 9588-031-0945 | ND |
| 2016-05-24 | 9588-033-0935 | ND |
| 2016-05-24 | 9588-035-0910 | ND |
| 2016-06-16 | 9588-014-1128 | ND |
| 2016-07-07 | 9588-014-1200 | ND |
| 2016-08-30 | 9588-020-0935 | ND |
| 2016-08-30 | 9588-031-1005 | ND |
| 2016-08-30 | 9588-033-0925 | ND |
| 2016-08-30 | 9588-035-0945 | ND |
| 2016-09-08 | 9588-014-1415 | ND |
| 2016-10-13 | 9588-014-1100 | ND |
| 2016-11-17 | 9588-014-1130 | ND |
| 2016-11-18 | 9588-020-0820 | ND |
| 2016-11-18 | 9588-031-0845 | ND |
| 2016-11-18 | 9588-033-0815 | ND |
| 2016-11-18 | 9588-035-0825 | ND |
| 2017-02-22 | 9588-020-0950 | ND |
| 2017-02-22 | 9588-033-0925 | ND |
| 2017-02-22 | 9588-035-1010 | ND |
| 2017-03-10 | 9588-031-0755 | ND |
| 2017-05-05 | 9588-020-0925 | ND |
| 2017-05-05 | 9588-031-0905 | ND |
| 2017-05-05 | 9588-033-0915 | ND |
| 2017-05-05 | 9588-035-0850 | ND |
| 2017-08-04 | 9588-020-0950 | ND |
| 2017-08-04 | 9588-031-1000 | ND |
| 2017-08-04 | 9588-033-1010 | ND |
| 2017-08-04 | 9588-035-1120 | ND |
| 2017-11-16 | 9588-020-0855 | ND |
| 2017-11-16 | 9588-031-0910 | ND |
| 2017-11-16 | 9588-033-0845 | ND |
| 2017-11-16 | 9588-035-0920 | ND |
| 2018-02-23 | 9588-020-0925 | ND |
| 2018-02-23 | 9588-031-0950 | ND |
| 2018-02-23 | 9588-033-0935 | ND |
| 2018-02-23 | 9588-035-0905 | ND |
| 2018-05-15 | 9588-020-0935 | ND |
| 2018-05-15 | 9588-031-0925 | ND |
| 2018-05-15 | 9588-033-0950 | ND |
| 2018-05-15 | 9588-035-0915 | ND |
| 2018-08-28 | 9588-020-1000 | ND |
| 2018-08-28 | 9588-031-1025 | ND |
| 2018-08-28 | 9588-033-1045 | ND |
| 2018-08-28 | 9588-035-0935 | ND |
| 2018-11-20 | 9588-020-0900 | ND |
| 2018-11-20 | 9588-031-0930 | ND |
| 2018-11-20 | 9588-033-0910 | ND |
| 2018-11-20 | 9588-035-0855 | ND |
| 2019-02-27 | 9588-020-0845 | ND |
| 2019-02-27 | 9588-031-0930 | ND |
| 2019-02-27 | 9588-033-0905 | ND |
| 2019-02-27 | 9588-035-0830 | ND |
| 2019-05-28 | 9588-020-0910 | ND |
| 2019-05-28 | 9588-031-0915 | ND |
| 2019-05-28 | 9588-033-0925 | ND |
| 2019-05-28 | 9588-035-0900 | ND |
| 2019-08-28 | 9588-020-0810 | ND |
| 2019-08-28 | 9588-031-0830 | ND |
| 2019-08-28 | 9588-033-0800 | ND |
| 2019-08-28 | 9588-035-0825 | ND |
| 2019-11-21 | 9588-020-0945 | ND |
| 2019-11-21 | 9588-031-0915 | ND |
| 2019-11-21 | 9588-033-0935 | ND |
| 2019-11-21 | 9588-035-0925 | ND |