Two studies of Virginia's Coastal Plain aquifer system — one USGS (April), one DEQ (released in July, six months past its legislative deadline) — cover the same geology and reach compatible conclusions.
The USGS found that reduced pumping from 2010 to 2023 produced modest aquifer recovery across the coastal plain. But the deepest, most-tapped layer receives only about 7% of surface rainfall as recharge. Recovery was real and geologically slow, and per the DEQ study, it peaked around 2021. Regional declines are projected to resume within five to ten years at current pumping levels.
The DEQ study modeled what happens when a single large industrial user — 3 million gallons per day, roughly what a hyperscale data center running evaporative cooling requires — taps in east of I-95. It failed state permitting criteria at every location tested. The most favorable site could sustain 360,000 gallons daily. Near the I-95 corridor where data centers cluster: under 30,000.
Data centers currently account for under 0.5% of Virginia's statewide water withdrawals. Neither study identifies them as a driver of current aquifer conditions. The aquifer's problem is capacity, not blame: there is almost no room for new industrial withdrawals at the volumes being proposed.
The permit gap: Between 2014 and 2017, DEQ cut the 14 largest users' combined permitted withdrawals from 147 to 74 million gallons/day. Most pump below even those reduced limits. But the DEQ study projects declines resuming at current permitted volumes — the gap is headroom on paper for existing users, not available capacity for new ones.
Eastern Shore, still depleting: Unlike the mainland, the Eastern Shore's confined aquifer is near its highest-ever withdrawal rate. Storage loss continues, with rising saltwater intrusion risk.
Hampton Roads vulnerability: The region injects treated wastewater underground to reverse land subsidence. Per the DEQ report, one significant new industrial user could undermine that effort.
What Virginia enacted (June 2026): After January 1, 2027, new data centers east of I-95 must use air cooling, 100% recycled water, or closed-loop systems — effectively banning new evaporative groundwater cooling. By 2032, existing facilities in designated scarcity areas must retrofit.