Love is in the air- and the wastewater.

The annual Valentine's Day tour of the Newtown Creek Wastewater Resource Recovery Facility sold out in just 16 minutes this year, according to the city's Department of Environmental Protection.

An agency spokesperson said 400 people booked a spot for the tour at the Greenpoint facility on the February 14th.

Guests will get a run-down on how the wastewater treatment plant workd, and they will be treated to a view of the city from the 120-foot high observation deck atop the plant's igonic digester eggs.

The agency has been giving public Valentine's Day tours since 2012.

Located in Brooklyn’s Greenpoint neighborhood, the Newtown Creek plant went into operation in 1967 and serves approximately 1 million residents in a drainage area of more than 15,000 acres (25 square miles), including portions of Manhattan, western Queens and northern Brooklyn. The plant is the City’s largest wastewater resource recovery facility, recently underwent a $5 billion upgrade and has been honored by The New York City Public Design Commission with two Awards for Excellence in Design.

DEP manages New York City’s water supply, providing approximately 1 billion gallons of high quality drinking water each day to more than 9 million residents, including 8.6 million in New York City. The water is delivered from a watershed that extends more than 125 miles from the city, comprising 19 reservoirs and three controlled lakes. Approximately 7,000 miles of water mains, tunnels and aqueducts bring water to homes and businesses throughout the five boroughs, and 7,500 miles of sewer lines and 96 pump stations take wastewater to 14 in-city treatment plants. DEP has nearly 6,000 employees, including almost 1,000 in the upstate watershed. In addition, DEP has a robust capital program, with a planned $19.4 billion in investments over the next 10 years that will create up to 3,000 construction-related jobs per year.