Toluene
Regional Water Authority
Toluene is a volatile solvent that harms the nervous and immune systems, damages the liver and may increase the risk of miscarriage and birth defects. Read More.
Toluene is a petroleum-derived chemical found in gasoline and used as a solvent in paints, adhesives and cleaning supplies. Toluene is highly neurotoxic. Exposure can cause fatigue and nausea, and may lead to nervous system disorders.
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 | ND | 10 | 0 | ND |
| 2019 | ND | 11 | 0 | ND |
| 2020 | ND | 10 | 0 | ND |
| 2021 | ND | 11 | 0 | ND |
| 2022 | ND | 11 | 0 | ND |
| 2023 | ND | 30 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 150 ppb
The EWG Health Guideline of 150 ppb for toluene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.
EPA Maximum Contaminant
Level (MCL): 1,000 ppb
The legal limit for toluene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-05 | VOC1 200489128 | ND |
| 2018-03-05 | VOC1 200489156 | ND |
| 2018-03-05 | VOC1 200489150 | ND |
| 2018-03-05 | VOC1 200489129 | ND |
| 2018-03-06 | VOC1 200489295 | ND |
| 2018-03-06 | VOC1 200489298 | ND |
| 2018-03-06 | VOC1 200489296 | ND |
| 2018-08-17 | VOC1 200502735 | ND |
| 2018-11-29 | VOC1 200514106 | ND |
| 2018-11-29 | VOC1 200514121 | ND |
| 2019-03-04 | VOC1 200523176 | ND |
| 2019-03-04 | VOC1 200523175 | ND |
| 2019-03-04 | VOC1 200523151 | ND |
| 2019-03-04 | VOC1 200523150 | ND |
| 2019-03-05 | VOC1 200523251 | ND |
| 2019-03-05 | VOC1 200523254 | ND |
| 2019-03-05 | VOC1 200523252 | ND |
| 2019-03-05 | VOC1 200523253 | ND |
| 2019-03-05 | VOC1 200523284 | ND |
| 2019-03-05 | VOC1 200523286 | ND |
| 2019-05-08 | VOC1 200531298 | ND |
| 2020-03-02 | VOC1 200567665 | ND |
| 2020-03-02 | VOC1 200567639 | ND |
| 2020-03-02 | VOC1 200567640 | ND |
| 2020-03-02 | VOC1 200567664 | ND |
| 2020-03-02 | VOC1 200567639A | ND |
| 2020-03-03 | VOC1 200567761 | ND |
| 2020-03-03 | VOC1 200567764 | ND |
| 2020-03-03 | VOC1 200567762 | ND |
| 2020-03-03 | VOC1 200567961 | ND |
| 2020-03-05 | VOC1 200568299 | ND |
| 2021-03-08 | VOC1 200608882 | ND |
| 2021-03-08 | VOC1 200608885 | ND |
| 2021-03-08 | VOC1 200608801 | ND |
| 2021-03-09 | VOC1 200608962 | ND |
| 2021-03-09 | VOC1 200608960 | ND |
| 2021-03-09 | VOC1 200608959 | ND |
| 2021-03-09 | VOC1 200608951 | ND |
| 2021-03-09 | VOC1 200608924 | ND |
| 2021-03-09 | VOC1 200608986 | ND |
| 2021-03-10 | VOC1 200609193 | ND |
| 2021-09-14 | V300058206 300058876 | ND |
| 2022-03-07 | V300153337 300153343 | ND |
| 2022-03-07 | V300153401 300153407 | ND |
| 2022-03-07 | V300153384 300153390 | ND |
| 2022-03-07 | V300153323 300153329 | ND |
| 2022-03-08 | V300153972 300153978 | ND |
| 2022-03-08 | V300153964 300153970 | ND |
| 2022-03-08 | V300153956 300153962 | ND |
| 2022-03-08 | V300154039 300154044 | ND |
| 2022-03-08 | V300154049 300154054 | ND |
| 2022-03-09 | V300154647 300154653 | ND |
| 2022-03-09 | V300154596 300154602 | ND |
| 2023-02-06 | V300305519 300305525 | ND |
| 2023-02-21 | V300312034 300312489 | ND |
| 2023-02-21 | V300312044 300312491 | ND |
| 2023-02-21 | V300312000 300312269 | ND |
| 2023-02-21 | V300312008 300312271 | ND |
| 2023-03-06 | V300316345 300316348 | ND |
| 2023-03-06 | V300316312 300316315 | ND |
| 2023-03-06 | V300316298 300316301 | ND |
| 2023-03-06 | V300316304 300316310 | ND |
| 2023-03-06 | V300316290 300316296 | ND |
| 2023-03-06 | V300316337 300316343 | ND |
| 2023-03-07 | V300316907 300316913 | ND |
| 2023-03-07 | V300316899 300316905 | ND |
| 2023-03-07 | V300317611 300317617 | ND |
| 2023-03-07 | V300317619 300317622 | ND |
| 2023-03-08 | V300318416 300318422 | ND |
| 2023-03-08 | V300317948 300317953 | ND |
| 2023-03-08 | V300317958 300317963 | ND |
| 2023-03-09 | V300319225 300319231 | ND |
| 2023-06-05 | V300358561 300358568 | ND |
| 2023-06-06 | V300359376 300359383 | ND |
| 2023-06-06 | V300359368 300359375 | ND |
| 2023-06-06 | V300359360 300359367 | ND |
| 2023-06-06 | V300359352 300359359 | ND |
| 2023-06-06 | V300359024 300359031 | ND |
| 2023-06-06 | V300359033 300359040 | ND |
| 2023-06-06 | V300359384 300359391 | ND |
| 2023-06-06 | V300359393 300359400 | ND |
| 2023-06-07 | V300360413 300360420 | ND |
| 2023-06-07 | V300360421 300360428 | ND |