KETCHIKAN, Alaska -

The city of Ketchikan plans to add chloramines to its drinking water but some residents are not welcoming the change.

The Ketchikan Daily News reports the city would be the first in Alaska to join about one-fifth of the nation in using chloramine-treated water.

Chloramines form when a small amount of ammonia is added to chlorine-treated water. According to the federal environmental Protection Agency, they kill harmful organisms in pipes such as those that cause Legionnaires' disease.

State and federal agencies for years have warned Ketchikan that its water contains an unacceptable level of organic byproducts. Using chloramines is cheaper than a filtration plant.

A group called United Citizens For Better Water opposes the plan. Spokeswoman Amanda Mitchell says chloramines can kill fish and cause an allergic reaction.