Dalapon
Patterson Water System
The herbicide dalapon has not been used in the U.S. since 1999. In animal studies, exposure to dalapon harms the kidneys.
22
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 |
|---|---|---|---|---|
| 2018 | ND | 4 | 0 | ND |
| 2019 | 1.25 ppb | 8 | 4 | ND - 3.10 ppb |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | 0.285 ppb | 2 | 1 | ND - 0.570 ppb |
| 2023 | 0.270 ppb | 2 | 1 | ND - 0.540 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-25 | 35370415002 | ND |
| 2018-01-25 | 35370415002 | ND |
| 2018-07-09 | 35403035001 | ND |
| 2018-07-09 | 35403035001 | ND |
| 2019-01-15 | 35442674001 | ND |
| 2019-01-15 | 35442674001 | ND |
| 2019-07-09 | 35480730001 | ND |
| 2019-07-09 | 35480730001 | ND |
| 2019-07-24 | 35484856001 | 1.90 ppb |
| 2019-07-24 | 35484856001 | 1.90 ppb |
| 2019-10-22 | 35507344001 | 3.10 ppb |
| 2019-10-22 | 35507344001 | 3.10 ppb |
| 2020-01-07 | 35522572001 | ND |
| 2020-01-07 | 35522572002 | ND |
| 2020-04-14 | 35544199001 | ND |
| 2020-09-28 | 35581278001 | ND |
| 2021-03-25 | 35621782001 | ND |
| 2021-11-30 | 35681445001 | ND |
| 2022-01-06 | 35688920001 | ND |
| 2022-07-28 | 35735506001 | 0.570 ppb |
| 2023-09-27 | 35830712001 | ND |
| 2023-10-09 | 35833383001 | 0.540 ppb |