Watercolour of a small house at dusk, with the water meter cover in the sidewalk out front.

Is there lead in Yellowstone Np's tap water?

2PPBparts per billion of lead in Ynp-Old Faithful's water at the latest test, in tests since 2026

Under the legal limit of 15 ppb

Water companies that supply Yellowstone Np

2 public water companies list Yellowstone Np as a place they supply. The biggest is Ynp-Old Faithful, with about 7,745 people. The highest latest result among Yellowstone Np's water companies is 2 parts per billion, at Ynp-Old Faithful. None of the 2 with results was above 15 at its latest test. 1 found too little lead to measure. Small ones like Ynp-Mammoth Hot Springs supply just their own grounds or street; most of Yellowstone Np gets its water from Ynp-Old Faithful. Your water bill names yours.

Ynp-Old Faithfulabout 7,745 people · latest lead test: 2 ppb · 307-344-9051
Ynp-Mammoth Hot Springsabout 2,600 people · latest lead test: none found · 307-344-9051

Next: is my pipe lead? · who pays? · which filter?