1,4-Dioxane
Lynwood 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 | 2.47 ppb | 18 | 17 | ND - 3.80 ppb |
| 2015 | 3.06 ppb | 11 | 11 | 1.70 ppb - 5.20 ppb |
| 2016 | 3.11 ppb | 8 | 8 | 2.70 ppb - 3.40 ppb |
| 2017 | 2.54 ppb | 10 | 10 | 1.60 ppb - 3.10 ppb |
| 2018 | 2.54 ppb | 11 | 11 | 1.70 ppb - 3.20 ppb |
| 2019 | 1.65 ppb | 11 | 8 | ND - 3.00 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 |
|---|---|---|
| 2014-01-22 | 9588-008-1115 | 3.20 ppb |
| 2014-01-22 | 9588-011-1049 | 2.80 ppb |
| 2014-01-22 | 9588-016-1038 | 1.60 ppb |
| 2014-01-29 | 4A29059-09A | 1.30 ppb |
| 2014-01-29 | 4A29059-11A | 2.60 ppb |
| 2014-01-29 | 4A29059-07A | 2.40 ppb |
| 2014-01-29 | 4A29059-01A | ND |
| 2014-01-29 | 4A29059-05A | 1.40 ppb |
| 2014-01-29 | 4A29059-03A | 1.80 ppb |
| 2014-04-24 | 9588-016-1418 | 2.00 ppb |
| 2014-04-24 | 9588-008-1445 | 3.60 ppb |
| 2014-04-24 | 9588-011-1430 | 3.60 ppb |
| 2014-07-16 | 9588-011-0953 | 3.40 ppb |
| 2014-07-16 | 9588-016-0925 | 2.00 ppb |
| 2014-07-16 | 9588-008-1040 | 3.70 ppb |
| 2014-10-15 | 9588-011-0830 | 3.40 ppb |
| 2014-10-15 | 9588-008-0911 | 3.80 ppb |
| 2014-10-15 | 9588-016-0818 | 1.90 ppb |
| 2015-01-14 | 9588-011-1015 | 3.00 ppb |
| 2015-01-14 | 9588-016-0957 | 1.70 ppb |
| 2015-01-14 | 9588-008-1040 | 3.20 ppb |
| 2015-04-08 | 9588-016-0936 | 1.70 ppb |
| 2015-04-08 | 9588-008-1044 | 3.40 ppb |
| 2015-06-22 | 9588-011-0954 | 5.20 ppb |
| 2015-07-15 | 9588-008-1120 | 3.80 ppb |
| 2015-07-15 | 9588-016-1025 | 1.80 ppb |
| 2015-07-15 | 9588-011-1055 | 3.40 ppb |
| 2015-10-14 | 9588-011-1030 | 3.10 ppb |
| 2015-10-14 | 9588-008-0940 | 3.40 ppb |
| 2016-01-13 | 9588-011-1225 | 3.00 ppb |
| 2016-01-13 | 9588-008-1300 | 3.20 ppb |
| 2016-04-13 | 9588-011-0940 | 3.00 ppb |
| 2016-04-13 | 9588-008-1018 | 3.30 ppb |
| 2016-07-13 | 9588-011-0940 | 3.00 ppb |
| 2016-07-13 | 9588-008-1030 | 3.30 ppb |
| 2016-10-12 | 9588-011-0944 | 2.70 ppb |
| 2016-10-12 | 9588-008-1001 | 3.40 ppb |
| 2017-01-11 | 9588-011-1002 | 2.70 ppb |
| 2017-01-11 | 9588-008-0945 | 3.10 ppb |
| 2017-04-19 | 9588-011-0950 | 2.50 ppb |
| 2017-04-19 | 9588-008-1025 | 2.80 ppb |
| 2017-06-20 | 9588-016-0930 | 1.90 ppb |
| 2017-07-12 | 9588-011-1000 | 3.00 ppb |
| 2017-07-12 | 9588-008-1015 | 3.10 ppb |
| 2017-07-12 | 9588-016-0945 | 1.70 ppb |
| 2017-10-11 | 9588-008-1040 | 3.00 ppb |
| 2017-10-18 | 9588-016-0917 | 1.60 ppb |
| 2018-01-10 | 9588-016-0946 | 1.90 ppb |
| 2018-01-10 | 9588-011-1013 | 3.10 ppb |
| 2018-01-10 | 9588-008-1115 | 3.10 ppb |
| 2018-04-18 | 9588-016-0950 | 1.80 ppb |
| 2018-04-18 | 9588-011-1008 | 2.70 ppb |
| 2018-06-28 | 9588-008-0930 | 3.00 ppb |
| 2018-07-09 | 9588-016-0933 | 1.70 ppb |
| 2018-07-09 | 9588-011-0944 | 2.90 ppb |
| 2018-07-09 | 9588-008-0914 | 3.20 ppb |
| 2018-10-17 | 9588-016-1005 | 1.70 ppb |
| 2018-10-17 | 9588-008-1028 | 2.80 ppb |
| 2019-01-09 | 9588-016-0945 | 1.70 ppb |
| 2019-01-09 | 9588-008-1005 | 2.90 ppb |
| 2019-04-10 | 9588-008-1040 | 3.00 ppb |
| 2019-04-10 | 9588-016-1000 | 1.50 ppb |
| 2019-04-10 | 9588-009-1022 | ND |
| 2019-07-11 | 9588-008-1000 | 2.70 ppb |
| 2019-07-11 | 9588-016-0940 | 1.50 ppb |
| 2019-07-11 | 9588-009-1015 | ND |
| 2019-10-16 | 9588-008-1035 | 3.00 ppb |
| 2019-10-16 | 9588-016-1020 | 1.80 ppb |
| 2019-10-16 | 9588-009-1050 | ND |