DEC: Vermont about 35% toward Lake Champlain phosphorus goal; models, not full-scale monitoring, drive reported progress
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Summary
Department of Environmental Conservation officials told the House Appropriations Committee they are using modeled estimates calibrated with targeted monitoring to track progress toward Lake Champlain's TMDL; the state reports about 35% of the needed phosphorus reductions have been achieved and stressed continued investment and capacity-building.
Gianna Petito, deputy director of the Water Investment Division at the Department of Environmental Conservation, told the House Appropriations Committee on April 15 that the Clean Water Initiative is an interagency, statute-based effort that combines programs, staff and financing to meet Vermont's water quality standards and provide "reasonable assurances" to the U.S. Environmental Protection Agency.
"This is an interagency initiative...founded in state statute," Petito said, describing the role of the Clean Water Board in prioritizing and recommending the Clean Water Fund budget and related capital appropriations. She noted Vermont's large nutrient TMDLs, including Lake Champlain and Lake Memphremagog for phosphorus and the Connecticut River basin for nitrogen, drive policy and funding choices.
Claire Madden, tracking and accounting supervisor in DEC's Clean Water Initiative program, told the committee the Lake Champlain TMDL sets a net reduction target of "212.4 metric tons per year of phosphorus" over a 20-year implementation period and that the state currently has quantified roughly 35% of the reductions needed to reach that target.
"We collect data for this reporting exercise once a year...and many programs that contribute data operate on funding and reporting cycles that don't align perfectly with our data-collection time frame," Madden said, describing data lags and the agency's approach of using strategically collected monitoring to inform models that then estimate phosphorus reductions across thousands of practices.
Committee members pressed DEC on whether modeled reductions reflect field measurements. Petito and Madden acknowledged that field sampling is expensive and that the modeling approach is informed by monitoring, targeted long-term sampling (including the LaRosa partnership), and research projects, but added that statewide TMDL accounting relies primarily on modeled estimates calibrated with monitoring rather than continuous, basin-scale sampling.
DEC officials said the agency is expanding tracking and accounting systems, investing in partner capacity, and using tactical basin plans and a tiered prioritization (prioritizing voluntary landscape projects, municipal regulatory projects, then private regulatory compliance) to guide spending. They emphasized the long time scales for many projects and the need for predictable funding to sustain implementation.
The committee paused to discuss specific programs that flow from Acts 64 (2015) and 76 (2019), which created the statutory framework and a state funding floor for the Clean Water Initiative. Petito said the board and fund are central to meeting the initiative's goals but are only one part of a wider network of state and federal investments.
The committee adjourned the presentation after members asked follow-up questions; the chair noted additional bills and updates will come before the committee in subsequent meetings.
