[en] The Los Alamos water supply for 1977 consisted of 1474 x 10⁶ gal from wells in three fields and 57 x 10⁶ gal from the gallery in Water Canyon. The production from the well fields was at its lowest volume since 1970. Water-level trends were as anticipated under current production practices. Well rehabilitation should be continued to ensure an adequate and reliable supply from wells that are 10 to over 25 yr old