The brides wore white — but hazmat suits might have been better.

Alison Schumer, the younger of Sen. Chuck Schumer’s two daughters, married Elizabeth Weiland on Sunday in Brooklyn, with the couple posing for wedding photos on a bridge over the toxic Gowanus Canal.

The white-dress-clad lovebirds, each clutching a mixed bouquet — with Alison Schumer wearing shoes as green as the Superfund site below them — held hands and shared a tender glance on the rust-flecked Union Street Bridge, which has become a popular backdrop for photos.

Starting around 10 a.m., the pair posed for several snaps along the tree-lined bridge before heading inside the nearby Green Building event space to exchange vows in a brief, intimate ceremony around noon.

The party, made up of close friends and family, then trekked across the street to a reception at 501 Union St. that lasted well into the early evening.

Alison Schumer, 29, is a six-figure product marketing manager at Facebook — which has donated about $50,000 to her Democratic Senate minority leader dad, a vocal defender of the social media titan on Capitol Hill.

Weiland, 33, is pursuing an MBA at Columbia Business School and works in the MTA’s strategic initiatives office, according to her LinkedIn profile.

Sen. Schumer showed up for his daughter’s big day wearing a green yarmulke and flanked by security guards as the NYPD closed down the street for his arrival.