1,4-Dioxane
Lynwood Park Mutual Water Company
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 | 3.89 ppb | 9 | 9 | 2.90 ppb - 5.70 ppb |
| 2015 | 3.60 ppb | 12 | 12 | 2.80 ppb - 4.10 ppb |
| 2016 | 3.42 ppb | 12 | 12 | 2.90 ppb - 3.70 ppb |
| 2017 | 3.21 ppb | 12 | 12 | 2.70 ppb - 3.70 ppb |
| 2018 | 3.19 ppb | 12 | 12 | 2.10 ppb - 3.70 ppb |
| 2019 | 3.15 ppb | 12 | 12 | 2.30 ppb - 4.20 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 |
|---|---|---|
| 2014-01-20 | 9588-002-1350 | 3.90 ppb |
| 2014-01-20 | 9588-001-1335 | 5.70 ppb |
| 2014-04-21 | 9588-002-1415 | 4.00 ppb |
| 2014-04-21 | 9588-001-1355 | 3.70 ppb |
| 2014-07-21 | 9588-002-1435 | 4.20 ppb |
| 2014-07-21 | 9588-001-1420 | 3.70 ppb |
| 2014-10-20 | 9588-003-1530 | 2.90 ppb |
| 2014-10-20 | 9588-002-1505 | 3.90 ppb |
| 2014-10-20 | 9588-001-1440 | 3.00 ppb |
| 2015-01-19 | 9588-001-1520 | 2.80 ppb |
| 2015-01-19 | 9588-002-1500 | 3.80 ppb |
| 2015-01-19 | 9588-001-1435 | 3.60 ppb |
| 2015-04-20 | 9588-001-1218 | 3.60 ppb |
| 2015-04-20 | 9588-002-1206 | 4.00 ppb |
| 2015-04-20 | 9588-003-1240 | 3.10 ppb |
| 2015-07-20 | 9588-003-1158 | 3.40 ppb |
| 2015-07-24 | 9588-001-1215 | 3.60 ppb |
| 2015-07-24 | 9588-002-1230 | 4.10 ppb |
| 2015-10-19 | 9588-003-1500 | 4.10 ppb |
| 2015-10-19 | 9588-002-1432 | 3.70 ppb |
| 2015-10-19 | 9588-001-1410 | 3.40 ppb |
| 2016-01-25 | 9588-003-1405 | 3.20 ppb |
| 2016-01-25 | 9588-001-1335 | 3.70 ppb |
| 2016-01-25 | 9588-002-1315 | 3.60 ppb |
| 2016-04-18 | 9588-001-1348 | 3.40 ppb |
| 2016-04-18 | 9588-002-1415 | 3.60 ppb |
| 2016-04-18 | 9588-003-1440 | 3.30 ppb |
| 2016-07-18 | 9588-002-1315 | 3.70 ppb |
| 2016-07-18 | 9588-003-1415 | 3.40 ppb |
| 2016-07-18 | 9588-001-1340 | 3.50 ppb |
| 2016-10-17 | 9588-003-1335 | 2.90 ppb |
| 2016-10-17 | 9588-002-1315 | 3.40 ppb |
| 2016-10-17 | 9588-001-1255 | 3.30 ppb |
| 2017-01-16 | 9588-002-1400 | 3.20 ppb |
| 2017-01-16 | 9588-003-1440 | 3.20 ppb |
| 2017-01-30 | 9588-001-1336 | 2.90 ppb |
| 2017-04-17 | 9588-002-1239 | 3.20 ppb |
| 2017-04-17 | 9588-003-1255 | 3.00 ppb |
| 2017-04-17 | 9588-001-1214 | 2.70 ppb |
| 2017-07-17 | 9588-002-1210 | 3.70 ppb |
| 2017-07-17 | 9588-003-1240 | 3.50 ppb |
| 2017-07-17 | 9588-001-1155 | 3.50 ppb |
| 2017-10-16 | 9588-003-1235 | 3.30 ppb |
| 2017-10-16 | 9588-001-1150 | 2.70 ppb |
| 2017-10-16 | 9588-002-1205 | 3.60 ppb |
| 2018-01-15 | 9588-001-1120 | 2.60 ppb |
| 2018-01-15 | 9588-002-1055 | 3.60 ppb |
| 2018-01-15 | 9588-003-1157 | 3.50 ppb |
| 2018-04-16 | 9588-001-1200 | 3.10 ppb |
| 2018-04-16 | 9588-002-1230 | 3.30 ppb |
| 2018-04-16 | 9588-003-1245 | 3.70 ppb |
| 2018-07-17 | 9588-001-1238 | 3.20 ppb |
| 2018-07-17 | 9588-002-1225 | 3.70 ppb |
| 2018-07-17 | 9588-003-1305 | 3.10 ppb |
| 2018-10-15 | 9588-003-1155 | 3.20 ppb |
| 2018-10-22 | 9588-002-1440 | 3.20 ppb |
| 2018-10-22 | 9588-001-1450 | 2.10 ppb |
| 2019-01-21 | 9588-003-1240 | 3.90 ppb |
| 2019-01-21 | 9588-001-1300 | 3.20 ppb |
| 2019-01-21 | 9588-002-1325 | 4.20 ppb |
| 2019-04-22 | 9588-001-1050 | 2.30 ppb |
| 2019-04-22 | 9588-003-1154 | 3.10 ppb |
| 2019-04-22 | 9588-002-1124 | 3.00 ppb |
| 2019-07-15 | 9588-003-1210 | 3.10 ppb |
| 2019-07-15 | 9588-001-1115 | 2.70 ppb |
| 2019-07-15 | 9588-002-1105 | 2.90 ppb |
| 2019-10-14 | 9588-003-1040 | 3.30 ppb |
| 2019-10-14 | 9588-001-1015 | 3.00 ppb |
| 2019-10-14 | 9588-002-1000 | 3.10 ppb |