2,4,5-TP (Silvex)
Cal-water Service Company - Chico
2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.
29
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 15 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 13 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 3 ppb
The EWG Health Guideline of 3 ppb for 2,4,5-TP 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) 50 ppb
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-14 | 5810-140-1233 | ND |
| 2014-01-29 | 5810-075-1015 | ND |
| 2014-01-29 | 5810-062-0940 | ND |
| 2014-02-05 | 5810-017-1305 | ND |
| 2014-02-26 | 5810-054-1041 | ND |
| 2014-03-11 | 5810-049-1135 | ND |
| 2014-04-10 | 5810-074-0850 | ND |
| 2014-04-16 | 5810-038-0842 | ND |
| 2014-04-23 | 5810-140-0920 | ND |
| 2014-05-06 | 5810-032-0904 | ND |
| 2014-05-12 | 5810-063-0916 | ND |
| 2014-05-13 | 5810-059-1040 | ND |
| 2014-05-13 | 5810-041-1142 | ND |
| 2014-06-24 | 5810-064-0939 | ND |
| 2014-12-17 | 5810-007-0807 | ND |
| 2015-07-14 | 5810-052-0700 | ND |
| 2017-01-05 | 9590-017-0958 | ND |
| 2017-01-18 | 9590-075-1127 | ND |
| 2017-01-18 | 9590-062-1037 | ND |
| 2017-02-14 | 9590-054-0902 | ND |
| 2017-03-07 | 9590-049-1118 | ND |
| 2017-03-22 | 9590-038-1140 | ND |
| 2017-04-04 | 9590-074-0812 | ND |
| 2017-05-04 | 9590-059-0908 | ND |
| 2017-05-10 | 9590-041-1113 | ND |
| 2017-05-10 | 9590-032-0850 | ND |
| 2017-05-15 | 9590-063-0806 | ND |
| 2017-06-19 | 9590-064-0926 | ND |
| 2017-11-13 | 9590-007-0832 | ND |