Dalapon
Quailwood Water System
NOTE: Quailwood Water System purchases water from Harris County Municipal Utility District 304 which is required to test for dalapon. Sample information shown below was taken by Harris County Municipal Utility District 304.
The herbicide dalapon has not been used in the U.S. since 1999. In animal studies, exposure to dalapon harms the kidneys.
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 200 ppb
The legal limit for dalapon, established in 1992, was based on a toxicity study in laboratory animals published in 1960.
ppb = parts per billion
All test results
NOTE: Quailwood Water System purchases water from Harris County Municipal Utility District 304 which is required to test for dalapon. Sample information shown below was taken by Harris County Municipal Utility District 304.
| Date | Lab ID | Result |
|---|---|---|
| 2014-07-09 | AC59178 | ND |
| 2014-07-09 | AC59188 | ND |
| 2015-05-12 | AC91550 | ND |
| 2016-05-09 | AD35832 | ND |
| 2017-02-06 | AD68893 | ND |
| 2017-05-05 | AD83026 | ND |
| 2018-05-15 | AE26360 | ND |
| 2019-07-15 | AE74394 | ND |