WATER SYSTEM AT TRENTON. It will take five years and $100,000 to remodel the water system of Trenton, N. J. All the smaller mains near manufacturing plants in the city will be replaced by larger, as well, also, those in the centre of the city which are too small. The thirty-inch main running from the reservoir to the corner of Willow street and Pennington avenue will be extended up the latter avenue to North Broad street, thence down First street to the corner of State street, replacing the sixteen-inch mains on State street, both east and west. Twenty-four-inch mains will certainly be run past the factories on East State street, and probably farther. Charles A. Hague, C. E., of the water department, will have the entire charge of the work.