Rules Governing Our Operation
Under the federal Surface Water Treatment Rule, surface supplies such as that used by the City of New York require filtration unless certain rigid requirements can be met.  New York City's filtration avoidance of its Catskill-Delaware supply was renewed in November 2002.  This filtration avoidance is ongoing and is anticipated to remain in effect into the future.  This filtration avoidance applies to the Shaft 22 aqueduct connection.

Despite the fact that the Water Works considers that it meets all filtration avoidance criteria at Rye Lake, New York State initiated an enforcement action against the Water Works in September, 1999 which requires the Water Works to build a filtration plant for the Rye Lake supply.  Construction is expected to begin in 2006, and the plant should be in service in early 2009.  This plant will also treat the water for West Harrison.