Minimum lot area and width. Each lot shall have an area of not less than 81,000 square feet measured within 360 feet of the front street property line and a lot width of not less than 225 feet, provided, however, that on a cul-de-sac or curved street each lot shall have a frontage along the front street property line of at least 75 feet and a lot width of 225 feet measured along a line 100 feet from the front street property line. Wherever public water from an off-site utility is available and is utilized to serve the development, lots may be reduced in area to 40,250 square feet measured within 230 feet of the front street property line and the lot width measured 100 feet from the front street property line, may be reduced to 175 feet.