A polling place on the North Side of Chicago is pictured on Nov. 8, 2022. (Patty Wetli / WTTW News)

With just one incumbent on the ballot and four seats up for grabs, the Metropolitan Water Reclamation District Board of Commissioners is guaranteed to welcome a raft of new faces once votes are tallied Tuesday night.

Fish species diversity has been increasing in the Chicago River. (Shedd Aquarium)

Back in the 1980s, the number of fish species found in the Chicago River could be counted on a single hand. Today, that number is up to 60 species, an increase in diversity that can be directly attributed to a decrease in wastewater pollutants, according to a new study from the Shedd Aquarium.

(WTTW News)

A University of Illinois Chicago lab and its partners have been tracking the virus that causes coronavirus in wastewater and sharing the data with local public health agencies. 

Repairs are just getting underway on a stretch of lakefront damaged by a storm in January 2020. (Courtesy of Metropolitan Water Reclamation District)

The repair, expected to take six weeks, will consist of piling 1,500 tons of rocks along the shoreline and building a concrete wall to guard against further erosion.

Heavy rains can overwhelm Chicago's sewer system. (Roman Grac / Pixabay)

The past few springs, Chicago has notched record-breaking rainfall totals. All that water has to go somewhere, and when it overwhelms the city’s sewers, untreated wastewater winds up in the Chicago River.

(Rudy and Peter Skitterians / Pixabay)

The second annual event offers simple ways to conserve water in advance of World Water Day.

With temperatures soaring above freezing in Chicago, the “big melt” is well underway. (Patty Wetli / WTTW News)

Postponing activities like laundry, running the dishwasher or even showering will provide maximum capacity in the sewers for snow melt.

(Courtesy: Metropolitan Water Reclamation District of Greater Chicago)

When it comes to designing buildings, form may follow function, but that doesn’t mean function has to be without form. Geoffrey Baer joins us with the story of the O’Brien Water Reclamation Plant and other ornamented utility buildings. 

A section of the MWRD's Deep Tunnel. (Metropolitan Water Reclamation District of Greater Chicago / Facebook)

An upcoming virtual tour will offer insights into the Metropolitan Water Reclamation District’s inner workings and will revisit the reversal of the Chicago River. 

A bighead carp, a type of Asian carp, caught in the Illinois River, the principal tributary of the Mississippi River. There are no North American fish large enough to eat Asian carp, according to the Asian Carp Regional Coordinating Committee. (Photo courtesy U.S. Geological Survey)

Efforts to increase demand for Asian carp as a food are aimed at buying time for development of a long-term solution to the threat posed by the invasive fish.

Goats and sheep on the job at MWRD's Calumet plant. (Metropolitan Water Reclamation District of Greater Chicago / Facebook)

A herd of 65 sheep and goats replaced more traditional mowing equipment this summer at MWRD’s Calumet Water Reclamation Plant, where the animals helped maintain the native prairie landscape. 

What’s so special about this fish? It’s all about the little yellow tag. (Metropolitan Water Reclamation District)

A largemouth bass fished from the Skokie River provided proof of the success of a 2018 dam removal on the Chicago River.

Keep wipes out of Chicago's sewer system. (Patty Wetli / WTTW)

The Metropolitan Water Reclamation District of Greater Chicago has seen a rise in disinfectant wipes stuck to filtering screens at its water reclamation plants, and it now has some advice for residents.

The MWRD labeled this image “how not to salt.” (Facebook / Metropolitan Water Reclamation District of Greater Chicago)

Overuse of salt as a de-icer can contaminate waterways and harm wildlife. Learn how much is too much – and what eco-friendly options exist.

MWRD says that new primary settling tanks at its Stickney Water Reclamation Plant are lowering its carbon footprint by trapping methane emissions and generating energy that can be returned to the plant. (Courtesy Metropolitan Water Reclamation District of Greater Chicago)

The Chicago area’s wastewater treatment agency says it is ahead of schedule in its efforts to combat climate change. 

Ice covers the Chicago River on Wednesday, Jan. 30, 2019. A deadly arctic deep freeze enveloped the Midwest with record-breaking temperatures triggering widespread closures of schools and businesses. (AP Photo / Teresa Crawford)

Melting snow and potential rain are likely to cause flooding as we head into a weekend warm-up following a record-setting Arctic blast.