Red Bank, N. J. (Rumson Improvement Company.) Designed by Allen Hazen, built in 1897. They are similar in construction to the Far Rockaway filters, and are used for iron removal only. Description: Eng. Record, Vol. 40, p. 412.
Hamilton, N. Y. Designed by the Stanwix Engineering Company, and were built in 1895 to filter lake water. Description: Eng. News, Vol. 39, p. 254.
Little Falls, N. Y. Designed by Stephen E. Babcock. These filters are open, and were built in 1898, and are used for filtering river water. Description: Eng. Record, Vol. 38, p. 7.
Somersworth, N. H. Designed by William Wheeler. These were the second vaulted filters to be built in the United States. The supply is from the Salmon Falls River and flows to the filters by gravity, the filters being below the river level. Description: Eng. News, Vol 40, p. 358; Eng. Record, Vol. 38, p. 270.
Berwyn, Penna. Designed by J. W. Ledoux. These open filters are used for filtering creek water. Description: Eng. News, Vol. 41, p. 150.
Harrisburg, Penna. (State Lunatic Hospital.) Designed by Allen Hazen; open masonry filters, used for treating the water from a small creek which is often muddy and is subject to pollution. No published description.
Albany, N. Y. Designed by Allen Hazen. Constructed 1898-99. This was the third and is the largest vaulted masonry filter plant yet constructed in the United States. It is used for filtering the Hudson River water, which is slightly muddy and much polluted by sewage. Description: Eng. News, Vol. 39, p. 91; Vol. 40, p. 254.
Rock Island, Ill. Designed by Jacob A. Harman. Open filters with embankments, used for filtering the Mississippi River water, which is very muddy and also polluted by sewage. No published description.