how fast to drip faucet to prevent freezing

You generally want a slow but steady trickle , not just an occasional drop, to help prevent pipes from freezing.
Quick Scoop
For most homes in freezing weather, aim for:
- A slow, continuous trickle rather than a single drip now and then.
- Rough guide:
- Not enough: one drop every few seconds (too slow).
* Too much: a solid, thick stream (wastes water).
* **Sweet spot:** drops falling quickly, almost forming a thin stream, roughly 1 drip per second to a thin “pencil‑lead” stream.
A practical way to set it:
- Turn the faucet on until you get a small stream.
- Slowly close it until that stream breaks into fast, individual drops that nearly merge together.
- Leave it there as long as the outdoor temperature is at or below about 20°F (or for prolonged subfreezing cold / power outages).
If you have separate hot and cold handles, crack both slightly so water moves in both lines; with a single handle, leave it in the middle.
Rule of thumb: if you have to stare to see if it’s moving, open it a bit more; if it looks like you’re filling a cup, close it a bit.