Just on the chance that anyone in the area hasn't heard about this...

http://sfwater.org/main.cfm/MC_ID/7/MSC_ID/67
"Water customers in San Francisco and communities in San Mateo, Santa Clara
and Alameda counties will begin receiving chloraminated water on February 2,
2004."

http://sfgate.com/cgi-bin/article.cg...GPH4J0HN23.DTL
"Fish and amphibian owners should buy products to neutralize or remove
chloramine from any water used in fish tanks or ponds."

"The system-wide conversion to chloramine, a combination of chlorine and
ammonia, will affect the agency's 2.4 million retail and wholesale customers
in San Francisco and parts of Alameda, San Mateo and Santa Clara counties."
"Agency officials said that more than one-third of the country's water
agencies already had made the switch to chloramine, including the East Bay
Municipal Utility District, Santa Clara Valley Water District, Contra Costa
Water District, Alameda County Water District and Marin Municipal Water
District."