Dalapon
Crescent City Water Treatment Plant
The herbicide dalapon has not been used in the U.S. since 1999. In animal studies, exposure to dalapon harms the kidneys.
11
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 | 1.70 ppb | 1 | 1 | 1.70 ppb |
| 2019 | 2.10 ppb | 4 | 4 | 1.50 ppb - 2.60 ppb |
| 2020 | 1.40 ppb | 2 | 1 | ND - 2.80 ppb |
| 2021 | 2.75 ppb | 2 | 2 | 2.20 ppb - 3.30 ppb |
| 2022 | 1.01 ppb | 1 | 1 | 1.01 ppb |
| 2023 | 1.10 ppb | 1 | 1 | 1.10 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 | Result |
|---|---|
| 2018-07-11 | 1.70 ppb |
| 2019-03-28 | 1.90 ppb |
| 2019-05-08 | 1.50 ppb |
| 2019-07-31 | 2.40 ppb |
| 2019-10-23 | 2.60 ppb |
| 2020-03-11 | ND |
| 2020-11-17 | 2.80 ppb |
| 2021-03-10 | 2.20 ppb |
| 2021-11-22 | 3.30 ppb |
| 2022-11-02 | 1.01 ppb |
| 2023-11-01 | 1.10 ppb |