With its sewer system under siege, tallying millions of dollars in equipment damage across its underground maze, New York City is confronting a menace that has gummed the gears of plumbing networks around the world: the common wet wipe.

In recent years, the intersection of evolving hygienic sensibilities and aggressive industry marketing has fueled the product’s rise. Wet wipes, long used for baby care, have grown popular with adults.

Some of the products are branded as “flushable” — a characterization contested by wastewater officials and plaintiffs bringing class-action lawsuits against wipes manufacturers for upending their plumbing.

Often, the wipes combine with other materials, like congealed grease, to create a sort of superknot. “They’re really indestructible,” said Vincent Sapienza, a deputy commissioner for the city’s Department of Environmental Protection. “I guess that’s the purpose.”