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 |
|---|---|---|---|---|
| 2018 | 3.19 ppb | 12 | 12 | 2.10 ppb - 3.70 ppb |
| 2019 | 3.15 ppb | 12 | 12 | 2.30 ppb - 4.20 ppb |
| 2020 | 2.67 ppb | 11 | 11 | 1.90 ppb - 3.30 ppb |
| 2021 | 2.48 ppb | 12 | 12 | 1.90 ppb - 2.90 ppb |
| 2022 | 2.56 ppb | 12 | 12 | 1.80 ppb - 4.00 ppb |
| 2023 | 2.28 ppb | 9 | 9 | 1.70 ppb - 3.00 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-01-15 | CA1910081_003_003-201801151157 | 3.50 ppb |
| 2018-01-15 | CA1910081_001_001-201801151120 | 2.60 ppb |
| 2018-01-15 | CA1910081_002_002-201801151055 | 3.60 ppb |
| 2018-04-16 | CA1910081_001_001-201804161200 | 3.10 ppb |
| 2018-04-16 | CA1910081_003_003-201804161245 | 3.70 ppb |
| 2018-04-16 | CA1910081_002_002-201804161230 | 3.30 ppb |
| 2018-07-17 | CA1910081_001_001-201807171238 | 3.20 ppb |
| 2018-07-17 | CA1910081_003_003-201807171305 | 3.10 ppb |
| 2018-07-17 | CA1910081_002_002-201807171225 | 3.70 ppb |
| 2018-10-15 | CA1910081_003_003-201810151155 | 3.20 ppb |
| 2018-10-22 | CA1910081_002_002-201810221440 | 3.20 ppb |
| 2018-10-22 | CA1910081_001_001-201810221450 | 2.10 ppb |
| 2019-01-21 | CA1910081_002_002-201901211325 | 4.20 ppb |
| 2019-01-21 | CA1910081_001_001-201901211300 | 3.20 ppb |
| 2019-01-21 | CA1910081_003_003-201901211240 | 3.90 ppb |
| 2019-04-22 | CA1910081_002_002-201904221124 | 3.00 ppb |
| 2019-04-22 | CA1910081_001_001-201904221050 | 2.30 ppb |
| 2019-04-22 | CA1910081_003_003-201904221154 | 3.10 ppb |
| 2019-07-15 | CA1910081_002_002-201907151105 | 2.90 ppb |
| 2019-07-15 | CA1910081_003_003-201907151210 | 3.10 ppb |
| 2019-07-15 | CA1910081_001_001-201907151115 | 2.70 ppb |
| 2019-10-14 | CA1910081_003_003-201910141040 | 3.30 ppb |
| 2019-10-14 | CA1910081_002_002-201910141000 | 3.10 ppb |
| 2019-10-14 | CA1910081_001_001-201910141015 | 3.00 ppb |
| 2020-03-16 | CA1910081_003_003-202003161125 | 3.30 ppb |
| 2020-04-20 | CA1910081_003_003-202004201050 | 3.30 ppb |
| 2020-04-20 | CA1910081_001_001-202004201015 | 2.90 ppb |
| 2020-04-20 | CA1910081_002_002-202004201034 | 2.80 ppb |
| 2020-06-22 | CA1910081_002_002-202006221057 | 2.40 ppb |
| 2020-07-21 | CA1910081_003_003-202007211205 | 3.10 ppb |
| 2020-07-21 | CA1910081_002_002-202007211128 | 2.50 ppb |
| 2020-07-21 | CA1910081_001_001-202007211224 | 2.70 ppb |
| 2020-10-19 | CA1910081_002_002-202010191028 | 1.90 ppb |
| 2020-10-19 | CA1910081_001_001-202010191015 | 2.10 ppb |
| 2020-10-19 | CA1910081_003_003-202010190955 | 2.40 ppb |
| 2021-01-18 | CA1910081_001_001-202101181115 | 2.40 ppb |
| 2021-01-18 | CA1910081_002_002-202101181120 | 2.30 ppb |
| 2021-01-18 | CA1910081_003_003-202101181100 | 2.90 ppb |
| 2021-04-20 | CA1910081_003_003-202104201106 | 2.80 ppb |
| 2021-04-20 | CA1910081_002_002-202104201130 | 1.90 ppb |
| 2021-04-20 | CA1910081_001_001-202104201123 | 2.20 ppb |
| 2021-07-19 | CA1910081_003_003-202107191231 | 2.80 ppb |
| 2021-07-19 | CA1910081_001_001-202107191201 | 2.40 ppb |
| 2021-07-27 | CA1910081_002_002-202107271158 | 2.00 ppb |
| 2021-10-18 | CA1910081_002_002-202110181405 | 2.50 ppb |
| 2021-10-18 | CA1910081_003_003-202110181330 | 2.90 ppb |
| 2021-11-22 | CA1910081_001_001-202111221042 | 2.70 ppb |
| 2022-01-17 | CA1910081_003_003-202201171027 | 3.00 ppb |
| 2022-01-17 | CA1910081_001_001-202201171045 | 1.80 ppb |
| 2022-01-17 | CA1910081_002_002-202201171052 | 2.00 ppb |
| 2022-04-18 | CA1910081_001_001-202204181033 | 2.10 ppb |
| 2022-04-18 | CA1910081_002_002-202204181049 | 2.00 ppb |
| 2022-04-18 | CA1910081_003_003-202204181020 | 2.50 ppb |
| 2022-07-18 | CA1910081_002_002-202207181120 | 2.20 ppb |
| 2022-07-18 | CA1910081_003_003-202207181100 | 3.00 ppb |
| 2022-08-15 | CA1910081_001_001-202208150957 | 2.10 ppb |
| 2022-10-17 | CA1910081_003_003-202210171230 | 4.00 ppb |
| 2022-10-17 | CA1910081_001_001-202210171255 | 2.90 ppb |
| 2022-10-17 | CA1910081_002_002-202210171318 | 3.10 ppb |
| 2023-01-16 | CA1910081_001_001-202301161055 | 2.40 ppb |
| 2023-01-16 | CA1910081_002_002-202301161105 | 2.40 ppb |
| 2023-01-16 | CA1910081_003_003-202301161011 | 3.00 ppb |
| 2023-04-18 | CA1910081_001_001-202304181610 | 2.00 ppb |
| 2023-04-18 | CA1910081_002_002-202304181630 | 1.80 ppb |
| 2023-04-18 | CA1910081_003_003-202304181535 | 2.40 ppb |
| 2023-10-17 | CA1910081_001_001-202310171125 | 2.00 ppb |
| 2023-10-17 | CA1910081_002_002-202310171145 | 1.70 ppb |
| 2023-10-17 | CA1910081_003_003-202310171050 | 2.80 ppb |