2,4,5-TP (Silvex)
Westerly Water Department
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 24 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 24 | 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 |
---|---|---|
2014-05-01 | BG39530-SOC | ND |
2014-05-01 | BG39529-SOC | ND |
2014-05-01 | BG39528-SOC | ND |
2014-05-02 | BG40111-SOC | ND |
2014-05-02 | BG40109-SOC | ND |
2014-05-06 | BG41004-SOC | ND |
2014-05-08 | BG42439-SOC | ND |
2014-05-13 | BG43968-SOC | ND |
2014-05-13 | BG43969-SOC | ND |
2014-05-14 | BG44525-SOC | ND |
2014-05-15 | BG45216_SOC | ND |
2014-05-15 | BG45214-SOC | ND |
2014-10-10 | BH26017_SOC | ND |
2014-10-10 | BH26015_SOC | ND |
2014-10-14 | BH27157_SOC | ND |
2014-10-14 | BH27159_SOC | ND |
2014-10-15 | BH27765_SOC | ND |
2014-10-15 | BH27767_SOC | ND |
2014-10-16 | BH28481_SOC | ND |
2014-10-16 | BH28479_SOC | ND |
2014-10-17 | BH28987_SOC | ND |
2014-10-17 | BH28985_SOC | ND |
2014-10-21 | BH30248_SOC | ND |
2014-10-21 | BH30250_SOC | ND |
2017-04-26 | BY10338_SOC | ND |
2017-04-26 | BY10335_SOC | ND |
2017-04-27 | BY11116_SOC | ND |
2017-04-27 | BY11112_SOC | ND |
2017-04-28 | BY11761_SOC | ND |
2017-04-28 | BY11768_SOC | ND |
2017-04-28 | BY11765_SOC | ND |
2017-05-02 | BY13336_SOC | ND |
2017-05-02 | BY13340_SOC | ND |
2017-05-03 | BY14006_SOC | ND |
2017-05-03 | BY14010_SOC | ND |
2017-05-16 | BY21037_SOC | ND |
2017-11-07 | BZ34010_SOC | ND |
2017-11-07 | BZ34008_SOC | ND |
2017-11-08 | BZ37670_SOC | ND |
2017-11-08 | BZ37668_SOC | ND |
2017-11-08 | BZ37666_SOC | ND |
2017-11-09 | BZ38809_SOC | ND |
2017-11-09 | BZ38935_SOC | ND |
2017-11-09 | BZ38807_SOC | ND |
2017-11-10 | BZ39477_SOC | ND |
2017-11-10 | BZ39479_SOC | ND |
2017-11-15 | BZ42165_SOC | ND |
2017-11-15 | BZ42167_SOC | ND |