The Weekly: How Maryland is Spending Its Conservation Dollars in Pennsylvania
Maryland is pioneering a cross-state conservation finance model to fund pollution reduction outside its borders while still meeting environmental obligations.
Maryland is pioneering a cross-state conservation finance model to fund pollution reduction outside its borders while still meeting environmental obligations.
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The Chesapeake Bay watershed covers 64,000 square miles, stretching from upstate New York through Pennsylvania and down into Maryland and Virginia. Water—and pollutants like nitrogen and phosphorus—flows regardless of state lines, but states sharing that watershed have, in many ways, managed their piece of it independently, a fragmented approach to an interconnected ecological system.
Maryland is now testing a different model: paying for pollution reduction across multiple states in the Susquehanna watershed, an eligible subwatershed of the Chesapeake Bay watershed.
Under the Chesapeake Bay Watershed Agreement, each state has nutrient-reduction targets to restore the Bay’s health. Through the Conowingo Pay for Success Program, Maryland has started spending its own conservation dollars on projects outside its borders, crediting the results toward its own nutrient-reduction obligations.
The model is administered through the Susquehanna River Basin Commission using $25 million in Maryland funding, and the model flips traditional conservation grant-making. Rather than reimbursing contractors for specific activities—a cover crop, a riparian buffer, etc.—the program purchases a single unit of environmental outcome: pounds of nitrogen kept out of the Bay. Applicants compete on cost per pound, meaning projects are selected and paid based on results rather than particular nutrient-reduction practices.
The legal predicate was Maryland’s 2022 Conservation Finance Act, which authorized the state to spend conservation funds outside its borders, provided the receiving state agreed to credit Maryland for the environmental outcomes achieved. “That was pretty radical at the time,” says Harry Huntley, agriculture policy lead at Environmental Policy Innovation Center (EPIC).
The common unit of measurement makes cross-state collaboration possible, says Grace Edinger, EPIC's Conservation Finance Policy Lead. “It can be very challenging to do a stream restoration project in Pennsylvania and compare that to a change in an agricultural practice in Maryland,” she says. Now, pounds of nitrogen kept out of the water become the common currency, which is easily quantifiable. “We all have the same outcome that can be compared apples to apples between states,” says Edinger. “Having that common language is a huge game changer.”
The communication infrastructure matters almost as much as the financing mechanism. “We have a Maryland program, a Pennsylvania program, a Virginia program, and the Susquehanna River Basin Commission that works across state lines, all with the same goal,” says Edinger. “Now they're all coming together and talking about it.”
Huntley and Edinger recently released a paper that examines the four programs to understand which aspects of their design lead to greater cost effectiveness. They found that each program makes choices the others could learn from.
“Maryland has these two things you can copy from Virginia; Virginia has this thing you can copy from Pennsylvania,” says Huntley. “Ultimately, everybody could have a better program.”
Maryland has always had a stake in what happens upstream, and this model makes that stake financially explicit. “If the outcome is Pennsylvania farmers using cover crops, why would Maryland fund Pennsylvania farmers?” says Huntley. “But when you can agree on this quantification methodology, it makes perfect sense that Maryland would pay for nitrogen reductions in the Chesapeake Bay, because we care about the Chesapeake Bay.”
It’s a replicable template, with three preconditions: a quantifiable outcome all parties agree to measure, authorization for one jurisdiction to spend outside its borders, and a coordinating body that can run the procurement.
Other states are paying attention: Washington has been conducting legal analysis on Pay for Success programs, California's Department of Water Resources runs similar outcome-based contracts, and lessons learned are finding their way to Missouri and Arizona. “For a long time in the Chesapeake Bay region, there were all these researchers saying, ‘Hey, this is the thing that makes sense’,” says Huntley. “Now there has been enough momentum here to show that not only can it be done, but it’s actually a great deal for taxpayers and waterways.”

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