All houses, buildings or properties used for human occupancy, employment, recreation, or other public use situated within the city and abutting on any street, alley or right-of-way in which there is now located or may in the future be located a public sanitary sewer of the city, is required at his expense to install suitable toilet and sewage facilities therein, and to connect the facilities directly with the proper public sewer in accordance with the provisions of this chapter, within thirty days after date of official notice to do so; provided, that the public sewer is within two hundred feet of the lot or parcel to be sewered. All new uses shall connect to the public sanitary sewer system unless such use lawfully incorporates no facilities generating sewage.