I did some water changes (and drank tap water) before I knew about this (without any issues to myself or fish).
"Although there was no evidence of contamination of the water, WSSC and Maryland Department of the Environment recommended that residents who live in some parts of Montgomery County outside of the beltway boil their water as a precaution."
Here's the latest update:
***update 9:00 P.M.***
WATER RESTORED TO MONTGOMERY COUNTY
MANDATORY WATER RESTRICTION IS LIFTED
BOIL WATER ADVISORY REMAINS IN EFFECT
Contact: WSSC Communications 301.206.8100
(Laurel, MD June 16, 2008): The Washington Suburban Sanitary Commission (WSSC) announced tonight that water service has been restored to all of Montgomery County and a mandatory water restriction has been lifted. The precautionary boil water advisory remains in effect for three days in some areas of the county.
The Washington Suburban Sanitary Commission (WSSC) has posted on its web site a map showing areas of Montgomery County where residents should continue boiling their water before consuming it. To view the map and to get more information, go to the WSSC website, www.wsscwater.com
and click on â€œareas affected by boil water order.â€