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Chloraminated water that gets into our storm drains and streams through lawn watering or other release is diluted enough that it will not harm fish. Monochloramine is already entering our storm drains and streams as the Merklin reservoir has been treated with monochloramine since 2010.
Fish do absorb monochloramine directly into their bloodstream through their gills which, at higher levels of concentration, can damage the gill tissue and enter the red blood cells causing a sudden and severe blood disorder. For fish owners, monochloramines can be removed from the water by using a water conditioner. Your pet supplier should be able to provide any further guidance you may need on these products.
The City recognizes that there are potential impacts to the environment with the use of monochloramine. Water Utility staff will carry chemical pucks and bags to neutralize the monochloramine in the unlikely event of a water main break. This type of response is common and is required for any treated water that is released to the environment, including water treated with chlorine.
Since 2010 there have been no issues.