2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12204Multi-epoch VLBA observations of the maser in NGC 4258 have yielded a 4% geometrical distance to the galaxy. The potential scientific payoffs of finding similar objects at large distances, in the Hubble flow, are considerable. In this contribution, I discuss the plausibility of detecting high-redshift water masers, and describe a search strategy that we have implemented to realize this objective.7 pages, 2 figures; to appear in "Highly-Redshifted Radio Lines", PASP, eds. C. Carilli, S. Radford, K. Menten, G. LangstonAstrophysicstext