Committee hears concerns over funding, liability and timelines for Vermont’s 3-acre stormwater permit

At a Natural Resources & Energy committee session, state environmental staff outlined the rationale for a draft permitting program that would require stormwater controls on developed parcels of three or more acres as part of Vermont’s strategy to reduce phosphorus loading into Lake Champlain.

The committee heard that the three-acre threshold and technical standards are intended to capture larger, previously unregulated impervious areas and to help the state meet Total Maximum Daily Load (TMDL) targets tied to the Vermont Clean Water Act (Act 64 of 2015). Emily Burke, Clean Water Initiative Program staff, summarized funding proposed alongside the permit: “5,000,000 initial investment from the Clean Water Fund and then $1,000,000 every year thereafter for municipal 3 acre sites,” paired with the Clean Water State Revolving Fund, she said.

The program’s purpose and technical basis State environmental staff explained that the three-acre cutoff was selected as a balance point based on modeled average phosphorus contributions from impervious surfaces and to avoid either under- or over-including sites. The permit would require retrofits that manage a water-quality “one-inch” storm for 50 percent of existing impervious area; new development would be held to a higher (100 percent) standard. Staff framed the rule as one piece of a multi-sector approach—alongside agriculture and municipal roads—needed to meet Lake Champlain TMDL targets established after federal litigation and EPA involvement.

Municipal officials outline costs, capacity and liability concerns David Pietro, public works director for the City of South Burlington, told the committee the city has identified 44 three‑acre sites totaling about 409 acres of impervious surface. “For 3 acre sites in South Burlington, we’ve got 44 sites, and that’s about 409 acres of impervious surface,” Pietro said, later noting cost experience: “Pre‑COVID it was about $70,000 an acre to treat sites,” and for more difficult projects his staff now estimate about $112,000 per acre.

Applying Pietro’s per‑acre figures to statewide inventories raised a funding gap concern: the statewide inventory cited in testimony identifies about 724 sites and roughly 5,800 acres; at $70,000 per acre that translates to an order‑of‑magnitude funding need in the hundreds of millions of dollars. Pietro contrasted that need with the bill’s funding level, which testimony described as a $5 million initial infusion and $1 million annually, and warned of municipal staffing and maintenance commitments for constructed stormwater systems.

Deadlines, MS4 permits and the risk of workload spikes Municipal speakers pressed the committee on timeline interactions. Several witnesses said extension of private‑property deadlines could create a concentrated workload later and complicate municipalities’ ability to meet federally required MS4 (municipal separate storm sewer system) flow‑restoration schedules. Pietro said that if many projects are deferred until the end of an extended compliance window, municipalities will face a shortfall of engineering and construction capacity: “We put our projects out to bid, and there’s only so many firms that will bid on them in the state.”

Regionalization, staffing and maintenance Testimony also covered regional approaches and examples of municipal cooperation. Pietro described shared services in Chittenden County and a recent example partnering with Shelburne, noting the potential efficiencies of shared equipment and technical staff but observing that many towns lack the staffing or budget to adopt full stormwater utilities. South Burlington’s current maintenance staffing was offered as context: a four‑person maintenance crew plus several superintendents and project managers support the city’s program.

Prioritization and technical questions Committee members and municipal officials asked whether proximity to waterways or hydrologic connectivity should influence project prioritization. Staff replied that modeled contributions, hydrologic connectivity and existing conveyance infrastructure can mean that even more‑distant impervious surfaces can transport pollutants to receiving waters, so prioritization is complex and context dependent. Staff and municipal witnesses asked the committee to consider incentives and clearer prioritization to avoid simultaneous large construction demand.

Public education and co‑benefits State staff highlighted programs such as the Green Schools Initiative as educational opportunities tied to on‑the‑ground stormwater practices; staff also agreed to provide supporting studies and resources to help municipalities and property owners understand how individual sites contribute to phosphorus loading.

What remained undecided at adjournment No formal vote or committee action occurred during the session. Committee members concluded the hearing and indicated they would return to the item at a later date.