Drinking Water Chemistry WS Proficiency Study Schedule
| 2024 WS Drinking Water Chemistry PT Study Schedule | ||
| Study Number | Study Opens | Study Closes |
| WS-137 | Jan. 8, 2024 | Feb. 21, 2024 |
| WS-138 | April 3, 2024 | May 17, 2024 |
| WS-139 | July 2, 2024 | Aug. 15, 2024 |
| WS-140 | Oct. 15, 2024 | Nov. 28, 2024 |
Analyte
| Chloroform | 5-50 ug/L |
| Bromoform | 5-50 ug/L |
| Bromodichloromethane | 5-50 ug/L |
| Chlorodibromomethane | 5-50 ug/L |
| Total Trihalomethanes | 20-200 ug/L |
