Do you have to swim in Pittsburgh’s rivers? A water researcher breaks down the reply

This story, by University of Pittsburgh Associate Professor of Geology & Environmental Science Daniel Bain,  was initially revealed at The Conversation, a member of the Pittsburgh Media Partnership. It is used right here with permission.

In May, newly drafted Pittsburgh Steelers offensive guard Gennings Dunker amused Pittsburgh residents during a news segment, asking whether or not it was OK to swim within the rivers or eat the fish he deliberate to catch.

The reside response — shock, laughter and greater than a bit uncertainty about the fitting reply — revealed one thing the Pittsburgh Water Collaboratory encounters commonly in its public outreach: Many Pittsburghers aren’t certain whether or not their rivers are protected.

 

Pennsylvanians have invested over US$1 billion in state funding over the previous 4 years to revive the Chesapeake Bay’s watershed high quality and ecosystem well being. Up north, policymakers in the U.S. and Canada are working together to maintain the Great Lakes intact.

Pennsylvania residents have a legal right to fishable, swimmable waterways — a normal the rivers of Pittsburgh haven’t at all times met.

As an associate professor of geology and environmental science, I examine how human exercise reshapes waterways and concrete landscapes. My discipline work with the Pittsburgh Water Collaboratory tracks adjustments within the metropolis’s streams and rivers over time.

The 3 rivers are bettering

Fifty years in the past, a fish population survey caught all the fish within the Braddock Locks, one of many 9 organizational buildings of the Monongahela River, and located a single fish. One fish.

In 2010, during a similar survey, over 23,000 fish, together with 32 completely different species, have been discovered.

That restoration is important, although fish populations alone don’t decide whether or not a river is protected for swimming.

“Swimmable” waters are a technical designation determined by regulators — primarily the Environmental Protection Agency and Pennsylvania’s Department of Environmental Protection — who estimate contamination thresholds above which swimming poses a significant well being threat. Below these thresholds, a physique of water is taken into account protected — although people nonetheless make their very own calculations.

Pittsburgh’s rivers are a problem

Dunker played college football in Iowa City, so the Iowa River gives a helpful comparability. It has its personal water high quality issues, together with dissolved nitrogen from fertilizer runoff and hog waste. But on this case, nitrogen is primarily a priority when you’re ingesting the water, not swimming in it.

Whether a river is formally “swimmable” and whether or not you wish to swim in it are two completely different questions.

Pittsburgh’s scenario is extra difficult, and it comes right down to sewage.

The metropolis has inherited lots of of sewer overflow factors all through town’s three rivers — the Allegheny, Monongahela and Ohio. There are lots of of factors within the sewer community the place heavy rain pushes a mixture of stormwater and raw sewage straight into the water. The Allegheny County Sanitary Authority, or ALCOSAN, is the regional sanitary authority. It says overflows can happen with as little as a tenth of an inch of rain.

The potential for publicity to uncooked sewage makes rivers within the ALCOSAN service space unswimmable for at the least 48 hours after rainstorms. The penalties of this are traditionally properly documented.

In 2002, a metropolis councilor selling the Pittsburgh Triathlon needed to swap the swim leg for a motorbike leg after an overflow. In 2013, triathlon racers reportedly fell sick after competing following a storm. The 2016 triathlon grew to become a “duathlon” — the swimming portion was canceled solely.

ALCOSAN warns of overflow impacts with orange flags at key factors alongside the rivers. Swimming throughout these intervals carries a significant threat of uncooked sewage publicity. For extra exact info, Three Rivers Waterkeeper, a nonprofit that helps shield and restore the water high quality of the Allegheny, Monongahela and Ohio rivers and their surrounding watersheds, samples the rivers and tributaries weekly every summer season as a part of its Swim Guide program.

Ultimately, ALCOSAN is working towards making overflows rare, although their planning horizon for these efforts stretches to 2046.

Even if Dunker retires as a beloved Steeler, the rivers at that time will seemingly nonetheless be unswimmable after rainstorms.

When is it protected to swim?

Even throughout dry stretches, Pittsburgh’s rivers carry the legacy of their industrial previous.

Abandoned coal mines and slag piles — mountains of waste left over from metal, mining and coal operations — proceed to contribute dissolved materials to southwestern Pennsylvania waters. And like nitrogen, their dangers to a swimmer aren’t properly understood. People are left making a private name with out a lot steerage.

Fishing has clearer path. Pennsylvania points specific advisories on how a lot fish you possibly can safely eat from a given stretch of river. These advisories account for that lingering contamination.

Dunker’s enthusiasm for the potential for fishable, swimmable rivers exhibits us what could possibly be.

Those who’ve lived in Pittsburgh for years have witnessed incidents, together with oil spills and sewage overflows, that invite skepticism about river security. But as we witness town’s rivers steadily enhance, a few of us wonder if they certainly will likely be fishable and swimmable within the close to future.

The march towards cleaner, more healthy rivers continues, and I consider joyous optimism like Dunker’s fuels this progress. But till we get there, Pittsburghers will all expertise intervals the place we can not freely fish or swim within the rivers that outline town.