Endrin
City of Conroe
Endrin is a banned organochlorine insecticide that is persistent and bioaccumulative. Endrin damages the nervous, immune and reproductive systems in people. It also harms fish, birds and other wildlife.
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 | ND | 1 | 0 | ND |
| 2015 | ND | 12 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 20 | 0 | ND |
| 2019 | ND | 8 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.3 ppb
The EWG Health Guideline of 0.3 ppb for endrin 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 change to the heart and blood vessels.
EPA Maximum Contaminant
Level (MCL) 2 ppb
The legal limit for endrin, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1960s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-09 | AC50023 | ND |
| 2015-01-21 | AC77156 | ND |
| 2015-01-21 | AC77151 | ND |
| 2015-01-21 | AC77158 | ND |
| 2015-01-21 | AC77155 | ND |
| 2015-01-21 | AC77152 | ND |
| 2015-01-21 | AC77153 | ND |
| 2015-01-21 | AC77159 | ND |
| 2015-01-21 | AC77154 | ND |
| 2015-05-26 | AC93326 | ND |
| 2015-05-26 | AC93324 | ND |
| 2015-07-01 | AC98339 | ND |
| 2015-11-19 | AD14307 | ND |
| 2016-01-11 | AD17424 | ND |
| 2016-01-11 | AD17425 | ND |
| 2016-01-11 | AD17427 | ND |
| 2016-04-06 | AD32172 | ND |
| 2016-08-04 | AD47220 | ND |
| 2017-04-11 | AD79289 | ND |
| 2017-05-18 | AD84950 | ND |
| 2017-07-20 | AD90204 | ND |
| 2017-10-04 | AD99365 | ND |
| 2018-01-10 | AE08770 | ND |
| 2018-01-10 | AE08765 | ND |
| 2018-01-10 | AE08767 | ND |
| 2018-01-10 | AE08766 | ND |
| 2018-01-10 | AE08768 | ND |
| 2018-01-10 | AE08781 | ND |
| 2018-01-10 | AE08782 | ND |
| 2018-01-10 | AE08769 | ND |
| 2018-03-08 | AE17681 | ND |
| 2018-03-08 | AE17682 | ND |
| 2018-05-08 | AE25656 | ND |
| 2018-05-08 | AE25653 | ND |
| 2018-05-08 | AE25654 | ND |
| 2018-05-08 | AE25655 | ND |
| 2018-07-02 | AE32329 | ND |
| 2018-07-02 | AE32328 | ND |
| 2018-07-02 | AE32330 | ND |
| 2018-10-01 | AE42287 | ND |
| 2018-10-01 | AE42288 | ND |
| 2018-10-01 | AE42292 | ND |
| 2019-03-11 | AE57937 | ND |
| 2019-03-11 | AE57921 | ND |
| 2019-04-08 | AE61493 | ND |
| 2019-04-08 | AE61492 | ND |
| 2019-04-08 | AE61491 | ND |
| 2019-04-08 | AE61489 | ND |
| 2019-09-24 | AE84471 | ND |
| 2019-10-15 | AE86695 | ND |