Alan, Julie, and everyone else on the LOCCNA listserv,
If you have a sudden unexplained drop in water pressure call EBMUD at their toll-free number -
(866) 403-2683.
EBMUD personnel will investigate the source of the water pressure drop. An investigator should be dispatched within the hour after your call is received.
Typically, pressure drops occur due to system maintenance (such as a shutdown), or because of a mainbreak somewhere close by.
If EBMUD personnel were to contact you in person, they will have identification to establish that they are employed by EBMUD. Do not hesitate to ask for identification.
A similar protocol should be observed by PG&E for outages of electricity or gas.
David Dempster