@Tis. Seems like we both have partial information. As you say, 2,4-D can be detected in the water column for some weeks. Yes, bottled water was supplied in some cases.
I couldn't find a specific online description on this matter, so I contacted DES.
Here's the reply:
Quote:
The new herbicide ProcellaCOR is the one that is gone in in 24 hours, and it actually has minimal use restrictions, and no need to supply water. Irrigation and other uses can resume within a couple days of treatment once testing shows herbicide concentrations are below limits.
2,4-D usually takes a few weeks to 6 weeks to disappear from the water column, and because it is so long-lived, may require that bottled water be provided for people whose water supplies may be restricted while herbicide concentrations are high.
We have greatly reduced use of 2,4-D in NH, and now are mostly using the new herbicide (ProcellaCOR) for variable milfoil and Eurasian milfoil control. For Winnipesaukee this year, no 2,4-D was used, or will be used.
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Good info.