Juvenile coho salmon swim swim in a holding pond at the Cascade Fish Hatchery in Cascade Locks, Ore, March 8, 2017. The Oregon Department of Fish and Wildlife, working with the Nez Perce tribe, is trucking 500,000 baby coho salmon 300 miles from the hatchery outside Portland to a remote corner of northeastern Oregon to reintroduce the species to the Lostine River. The area once had plentiful coho, but the species vanished from the Lostine River more than three decades ago. (Gillian Flaccus/AP)

The team will need Washington state permits for transporting salmon from a hatchery to the Puyallup lab, but Meador says this is a "minor issue" for the study.

"We just need to ensure those fish do not enter any natural waters," he says. "It's a bit early at this point since we don't need the permit until May, and it only takes a few weeks for the review process. The main issue is notifying the hatchery manager so they know we would like several hundred fish for our work. They are always accommodating. We have been doing this for a few decades and have never had an issue with getting such a transfer permit."

The researchers will also be looking at stormwater’s contribution to the overall contamination of wastewater effluent, as stormwater frequently winds up in wastewater during heavy rain.

“We'll do sampling with high flow and low flow to see what the contribution is from stormwater to this whole mass of compounds coming out,” Meador says.

The team will look for contaminants of emerging concern — like pharmaceuticals and personal care products — as well as enduring industrial chemicals, like PCBs. Certain concentrations of some pharmaceuticals and personal care products can make it harder for fish to grow and reproduce, which may harm orcas by reducing overall salmon numbers and nutrition quality.

However, chemicals like PCBs can pass to orcas themselves. Where fish can metabolize many pharmaceuticals in their liver and effectively get rid of them over time (if they survive), PCBs accumulate in animal tissue indefinitely and concentrate as they move up the food chain. Orcas retain toxic substances in their blubber to such a degree that they boast some of the highest contamination levels of all marine mammals.

The study may help researchers predict how much contamination winds up in orcas as a result of eating salmon.

“Would [salmon chemical contamination] possibly affect orcas? I mean it's kind of removed another level so there will be nothing definitive on that, but we can make some predictions, maybe on bioaccumulation or something,” Meador says.

A novel study

Doing controlled effluent exposure tests will produce important data points, says Jim West, a senior research scientist at the Washington Department of Fish and Wildlife who is in charge of monitoring toxics in organisms throughout Puget Sound. West sometimes consults Meador to understand the significance of bioconcentration values he finds in local aquatic life.

“[This] study offers an alternative to a more ‘classic’ or simpler toxicology approach where fish or other organisms are typically exposed to one chemical at a time in controlled lab studies,” West says.

“We tend to single out chemicals that we know are impacting some of these organisms,” the Department of Ecology's Hobbs confirms. “This [is the] kind of study where you’re looking at the whole sort of mixture, to give you an idea of what the response of the organism would be [to effluent].”

The scope of chemicals monitored in this study is also noteworthy. Meador says that even though it's expensive and difficult to do, they’ll attempt to identify hundreds of compounds, looking especially for newer chemicals and those that occur in low concentrations.

“I think it would — depending on the chemical analyses that are in it — likely add additional information on a suite of chemicals that we don't have a lot of information about,” says Cheryl Niemi, a longtime Department of Ecology specialist in surface water quality.

Attempting to evaluate all of the chemicals in a water sample is difficult by itself, and figuring out which ones are creating problems — alone or together — is not likely within the scope of the study. Meador says that while his team plans to whittle down the list of possibly important chemicals, the effort can get “pretty tricky.”

But the need for that data is substantial — especially for counties attempting to budget for water treatment programs. Stormwater runoff is largely believed to be the most significant pathway to the ocean for key contaminants, and a recent Department of Ecology report suggests wastewater may be a more significant vehicle for pharmaceuticals and personal care products.

“You want to figure out how much contamination organisms can tolerate, because it's super expensive to get rid of [contaminants],” West says. “When do we say, we're done cleaning up, or we're done controlling the sources of these contaminants? You don't want to be spending billions of dollars controlling chemicals that are already low enough to not be bothersome.”

But eliminating the ever-increasing number of potent chemicals that could adversely affect salmon, orcas and other marine wildlife requires efforts that start well before they reach the treatment plants. Niemi notes that “sewage treatment plants aren't designed to remove this huge onslaught of new chemicals” that people flush down toilets or that run off roadways. But a significant step toward developing upstream solutions will be to connect the chemicals to impacts in the first place.

“There are thousands and thousands of chemicals out there in commerce, and we are responsive to ones that cause problems in general. If we could get ahead of that … and be more predictive in our approach, then I think that would be really great for us,” Niemi says.

Update: Crosscut updates this article at 2:07p.m. on Nov.7, 2019, to clarify the type of permits needed for the study.