Virginia water and environmental permits for AI data centers

In short

Building an AI data center in Virginia requires a set of water and environmental permits from the Virginia Department of Environmental Quality (DEQ), the U.S. Army Corps of Engineers, and local governments. The key permits depend on whether your project disturbs land, withdraws water, affects wetlands or streams, or stores diesel fuel. Recent legislative and regulatory shifts are increasing scrutiny on water use and backup generators, and local opposition is reshaping where and how AI data centers can be built.

At a minimum, any project that clears or grades one acre or more must obtain coverage under the VPDES VAR10 construction stormwater permit. DEQ Construction General Permit page. If your site includes wetlands or streams, you will likely need a Virginia Water Protection Permit (VWP) and possibly a federal Clean Water Act Section 404 permit. Va. Code § 62.1-44.15:20. In designated groundwater management areas, wells pumping 300,000 gallons or more per month need a groundwater withdrawal permit. 9VAC25-610-40, 9VAC25-610-50. Aboveground diesel storage tanks above 660 gallons must be registered. 9VAC25-91. Projects in Tidewater Virginia must comply with additional Chesapeake Bay Preservation Act rules. 9VAC25-830-130(3)

What permits cover site clearing, grading, and erosion control?

Any land-disturbing activity in Virginia requires erosion and sediment control compliance. A land-disturbing activity of 10,000 square feet or more (or 2,500 square feet or more in a Chesapeake Bay Preservation Area) requires an erosion and sediment control plan submitted to the local VESCP authority, though the locality may reduce these thresholds to capture smaller projects. Va. Code § 62.1-44.15:51 et seq.

Local thresholds and minimum standards

The legal trigger is any land-disturbing activity. In practice, many Virginia localities set a specific square-footage threshold that requires a formal plan approval. Fairfax County, for example, requires a plan for any disturbance of 2,500 square feet or more. Fairfax County. Other localities may use 10,000 square feet.

Every approved plan must follow 19 minimum standards set by state regulation. 9VAC25-875-560. Those standards include the following.

Stabilize exposed soil within 7 days of reaching final grade.
Install sediment basins or traps as a first step.
Protect storm drain inlets from sediment.
Establish permanent vegetative cover.

The plan is often submitted to the local Virginia Erosion and Sediment Control Program (VESCP) authority. In localities that do not run their own approved program, the state DEQ administers the program directly.

What about stormwater runoff during construction?

Once you disturb one acre or more of land, or disturb less than one acre as part of a larger common plan of development, you need coverage under Virginia’s General VPDES Permit for Discharges of Stormwater from Construction Activities, known as VAR10. Virginia DEQ Stormwater Construction, DEQ stormwater construction.

How to get VAR10 coverage

Prepare a Stormwater Pollution Prevention Plan (SWPPP) and a stormwater management plan consistent with 9VAC25-875-500 and 9VAC25-875-510.
Submit the registration statement and plan to DEQ through the myDEQ Portal.
Receive a coverage letter from DEQ. You must have that letter in hand before the pre construction meeting.

You must submit the plan before any land-disturbing activity starts. The permit remains in effect for the entire duration of the disturbance.

Important dates for the VAR10 program

The current VAR10 permit runs from July 1, 2024, through June 30, 2029. 9VAC25-880. Plans submitted between July 1, 2024 and June 30, 2025 could follow either the brand new Virginia Stormwater Management Handbook v1.0 or the previous technical guide. After July 1, 2025, all plans must conform to the new handbook. WSSI

What if the project disturbs a stream, wetland, or other water body?

Any impact to surface waters in Virginia, even a temporary one, starts a series of permits. The two main layers are a state VWP permit and a federal Section 404 permit. A third layer, water quality certification, connects them.

Virginia Water Protection Permit

Any activity that permanently or temporarily impacts state surface waters requires a VWP permit. State surface waters include streams, rivers, lakes, and most wetlands. The law covers dredging, filling, excavating, permanent flooding, or impounding. Va. Code § 62.1-44.15:20, 9VAC25-210

The VWP program is broader than the federal Clean Water Act. Even after the U.S. Supreme Court’s Sackett v. EPA decision narrowed the federal definition of waters of the United States, Virginia’s definition of state waters remains unchanged. DEQ estimates that under the most conservative post Sackett interpretation, roughly 80% of non tidal wetlands in Virginia could fall outside federal jurisdiction but still require a state VWP permit. DEQ

Federal Section 404 permit (and Section 401 certification)

If the project will discharge dredged or fill material into a water of the United States, you need a Clean Water Act Section 404 permit from the U.S. Army Corps of Engineers. 33 U.S.C. § 1344. In Virginia, the Corps issues State Programmatic General Permits (SPGPs) that cover many common activities, and DEQ provides project review and verification on behalf of the Corps. DEQ

Any federal permit that may result in a discharge to state waters also needs a Section 401 water quality certification from DEQ. That certification confirms the discharge will meet Virginia’s water quality standards. 33 U.S.C. § 1341

Permit expiration and renewal

The current VWP General Permits and the 2022 SPGPs both expire August 1, 2026. New permits take effect August 2, 2026. If your project is not complete by the expiration date, you must apply for coverage under the new permits. DEQ

What permits are needed to withdraw water for cooling?

Most AI data centers in Virginia connect to a municipal water utility rather than pulling water directly from a river or aquifer. That means the facility itself often holds no direct withdrawal permit. Center for Secure Water, Univ. of Illinois. But the project’s water demand still matters, because the utility must have the necessary permits and capacity, and a developer that needs a new or expanded source may trigger its own permitting.

When a project does involve a direct withdrawal, the permit rules differ for surface water and groundwater, and for whether the source is tidal or nontidal.

Surface water withdrawals

A VWP permit is required for any permanent or temporary impact to state surface waters, including withdrawals. However, the regulations provide several important exemptions. A VWP permit is not required for the following.

Withdrawals from nontidal waters totaling less than 10,000 gallons per day. 9VAC25-210-310
Withdrawals from tidal waters for nonconsumptive uses or consumptive purposes under 2 million gallons per day. 9VAC25-210-310
Withdrawals for firefighting.
Surface water intakes that were already in existence on July 1, 1989 and have not increased in capacity. DEQ fact sheet

That exemption affects many existing withdrawals. In 2023, 76% of surface water withdrawals outside of power-generating facilities reported to DEQ were unpermitted legacy intakes. VCN. Developers should not assume a legacy withdrawal right on a site will automatically translate into available water, local opposition and agency scrutiny can still stall a project.

Groundwater withdrawals

If your site lies within a state declared Groundwater Management Area (GWMA), any well that withdraws 300,000 gallons or more in any single month needs a groundwater withdrawal permit from DEQ. 9VAC25-610

There are two GWMAs in Virginia. The Eastern Virginia GWMA covers all counties east of Interstate 95 plus the cities of Chesapeake, Franklin, Hampton, Hopewell, Newport News, Norfolk, Poquoson, Portsmouth, Suffolk, Virginia Beach, and Williamsburg. The Eastern Shore GWMA covers Accomack and Northampton Counties. 9VAC25-600-20

Outside a GWMA, groundwater withdrawals are largely unpermitted, but you still must report withdrawal volumes to DEQ under the separate reporting regulation discussed below.

Water withdrawal reporting

Even when no permit is required, Virginia law demands that any user who withdraws surface water or groundwater above certain thresholds file an annual report with DEQ. The trigger is an average daily withdrawal exceeding 10,000 gallons per day (or 300,000 gallons per month) for non-irrigation purposes. Reports are due by January 31 each year through the myDEQ Portal. 9VAC25-200

How are diesel fuel storage tanks regulated?

Most AI data centers maintain backup generators that run on diesel. The fuel storage tanks for those generators, whether above ground or underground, require registration and in some cases pollution prevention requirements.

Aboveground storage tanks

An aboveground storage tank (AST) holding more than 660 gallons of oil, including diesel, must be registered with DEQ and with the local emergency services coordinator. If the total aggregate tank capacity at the facility exceeds 1,320 gallons, the facility itself must also register. 9VAC25-91

When a single tank or the combined capacity reaches 25,000 gallons, the owner must comply with pollution prevention requirements, including inventory control, periodic testing, secondary containment, and staff training. The facility must also obtain a DEQ-approved Oil Discharge Contingency Plan before placing the tanks into service. 9VAC25-91

Underground storage tanks

Underground storage tanks (USTs) storing diesel are subject to a separate regulation. They must be registered with DEQ and meet technical standards for installation, operation, maintenance, and release detection. 9VAC25-580

DEQ’s January 2025 air permit clarification guidance for data centers, Clarification 2025-02, expressly addresses these storage tank rules and confirms how they apply to AI data center sites. Trinity Consultants

What special rules apply near the Chesapeake Bay?

The Chesapeake Bay Preservation Act imposes additional requirements on land disturbance in the 84 Tidewater Virginia localities. If your project lies within a Chesapeake Bay Preservation Area (CBPA) and involves more than 2,500 square feet of land disturbance, you must go through a plan of development review process before a building permit can be issued. Va. Code § 62.1-44.15:67 et seq., 9VAC25-830

CBPA designation splits land into two management zones. Resource Protection Areas (RPAs) include a 100 foot vegetated buffer along tidal wetlands, tidal shores, and perennial water bodies. Development in RPAs is strictly limited. Resource Management Areas (RMAs) allow more flexibility but must still meet performance criteria. The exact boundaries are mapped at the local government level, so early coordination with the locality is essential. 9VAC25-830

A site in Tidewater that does not appear to have wetlands could still contain RPAs or RMAs that require protective buffers and development constraints. This rule often surprises developers who focus only on federal wetland maps.

What recent legislative and regulatory changes should developers know?

The regulatory landscape for water and environmental permits continues to change, driven by rising water consumption, local opposition, and new legal mandates.

Water use and transparency bills

The 2025 Virginia General Assembly passed no meaningful AI data center water legislation. Bills that would have required transparency on water consumption, allowed localities to obtain water estimates during rezoning, and mandated site assessments for high energy use facilities all failed. Nature Forward, Climate XChange

The 2026 session produced several laws with direct permitting implications. HB153 allows localities to require site assessments covering water, agricultural, historic, and forest impacts from AI data centers. SB94 requires AI data centers to provide noise impact assessments and to disclose the new electric utility infrastructure needed. Virginia Conservation Network bill tracker A bill that would have required local water authorities to report individual AI data center water use to DEQ, HB589, was defeated. Another bill, SB553/HB496, requiring a water use assessment, was awaiting the Governor’s signature as of mid-May 2026. MultiState, Law firm analysis

Air and diesel generator standards

DEQ issued three clarification guidance documents on January 17, 2025, dealing with air permitting for data centers. Clarification 2025-02 confirmed the storage tank registration and spill plan thresholds described above. More broadly, DEQ guidance memo APG-576, effective April 9, 2026, sets a new presumptive Best Available Control Technology (BACT) for diesel generator sets at AI data centers. Starting July 1, 2026, any air permit application for AI data center diesel generators received on or after that date must meet Tier 4 equivalent emissions limits using selective catalytic reduction for nitrogen oxides, a diesel oxidation catalyst for carbon monoxide, and a diesel particulate filter for particulate matter. DEQ

To put the scale of existing backup generation in perspective, Virginia AI data centers hold air permits for nearly 9,000 diesel generators with a combined capacity of over 12 gigawatts in Northern Virginia alone. A University of California, Riverside study estimated that just 10% of those permitted emissions could create an annual public health burden of $190 to $260 million across Virginia and neighboring states. VCN, VCN, citing Han et al. 2024

Regional water planning deadlines

Virginia is moving toward basin-based regional water supply planning. By 2029, 25 newly designated Regional Planning Areas must each submit a jointly developed regional water supply plan. VCN The state has allocated modest grants to support the work, but the new plans could eventually impose limits or conditions on large-volume users.

Permit expiration dates to watch

VWP General Permits and 2022 SPGPs, which expire August 1, 2026. New permits take effect August 2, 2026. DEQ
VAR10 Construction General Permit expires June 30, 2029. 9VAC25-880

What are the biggest practical hurdles right now?

Beyond the black-letter permit requirements, several overlapping challenges make water and environmental permitting for AI data centers especially hard in Virginia today.

Water supply uncertainty

Virginia’s surface water permitting system has incomplete data. Roughly three-quarters of reported non power plant surface water withdrawals are unpermitted legacy intakes, and DEQ has acknowledged that its water supply models are flawed. VCN, Friends of the Rappahannock Some rivers may already be over allocated at low flow. The Potomac Aquifer in the Eastern Virginia GWMA is in decline, and DEQ is pushing localities to switch to surface water, shifting pressure onto rivers like the Rappahannock and James that themselves may face drought constraints. VCN

The ICPRB projects that if AI data center growth continues unchecked with standard cooling technologies, the industry could consume over 33% of the Potomac River basin’s water supply by 2050. Bay Journal Meanwhile, Loudoun County AI data centers used over 899 million gallons of potable water in 2023, a 250% increase since 2021. Moms Clean Air Force A single large AI data center can consume 5 million gallons per day, roughly the daily residential need of 50,000 people. Sierra Club

In practice, a developer evaluating a site cannot assume water will be available just because a utility’s distribution line reaches the property. Early water supply due diligence and coordination with the utility and DEQ are critical. The Caroline County Rappahannock River intake application is a clear example. DEQ initially issued a tentative decision to permit a surface water withdrawal that would have allocated 2.63 million gallons per day to AI data center campuses, but public opposition and additional environmental studies forced the county to remove the industrial cooling request. Friends of the Rappahannock

Local opposition and shifting zoning

Several Virginia localities have moved to tighten control over AI data center siting. Loudoun County eliminated by right AI data center development in March 2025. All proposals now face special-exception review and public comment. Moms Clean Air Force Chesapeake’s city council rejected an AI data center rezoning near a residential community in 2025 and moved to make AI data centers a conditional use rather than by right. Virginia Business The massive Wilderness Crossing project in Orange County, sited near a historic battlefield, drew national attention and an initial water withdrawal request was rejected by DEQ after it sought more water than the agency found supportable, though a permit at existing levels was subsequently approved. Virginia Mercury

Federal wetland jurisdiction in flux

As noted earlier, the Supreme Court’s Sackett decision has removed federal jurisdiction over many non-tidal wetlands. That can eliminate the need for a Section 404 permit on some sites, but it does not erase the VWP requirement, and it may increase the focus and mitigation demands DEQ places on the state permit.

Lack of facility-level transparency

No centralized public database tracks water use for individual AI data centers in Virginia. Because most facilities buy water through a municipal utility, consumption is rolled into utility-wide reports. The December 2024 JLARC report found that there is less oversight over how available water should be shared across various uses in a locality and recommended expressly authorizing local governments to require and consider water use estimates for proposed AI data center developments. JLARC

Key takeaways

Register for VAR10 stormwater coverage before any land disturbance on a site of one acre or more. Confirm whether your SWPPP must follow the new Virginia Stormwater Management Handbook v1.0, which became mandatory after July 1, 2025.
Check for wetlands and streams early. Even if federal Section 404 jurisdiction is limited post Sackett, Virginia’s VWP program still applies to most surface waters, and a VWP permit can take months.
If you plan a direct water withdrawal, determine whether the intake will rely on an unpermitted pre 1989 right and whether that right will withstand regulatory and public scrutiny. For groundwater in the Eastern Virginia GWMA, assume a permit will be required for any well above 300,000 gallons per month.
Register all aboveground diesel storage tanks over 660 gallons, and prepare an Oil Discharge Contingency Plan once total tankage hits 25,000 gallons. USTs must be registered under the separate underground tank rules.
Ask the local government whether the property lies within a Chesapeake Bay Preservation Area. The 100-foot RPA buffer can significantly constrain building footprints.
Watch the August 1, 2026, expiration of the current VWP General Permits and SPGPs. Any project that will not be finished by that date needs to secure coverage under the new permits.
Engage the water utility and DEQ early about supply availability, do not assume a municipal connection solves the water equation.
Monitor the Governor’s action on pending 2026 bills, especially any water use assessment legislation, and integrate community and noise impact data into the site plan upfront.

Frequently asked questions

Q:What is the threshold for needing a VPDES construction stormwater permit?

A:Any land-disturbing activity of one acre or more, or less than one acre if it is part of a larger common plan of development, requires coverage under the VAR10 general permit. Virginia DEQ Stormwater Construction

Q:Do I need a VWP permit just to connect to the municipal water system?

A:Generally no. If the AI data center receives all its water from a public utility and does not withdraw water directly from a surface water body or well, no individual VWP or groundwater withdrawal permit is required at the facility level. The utility itself holds the necessary permits. Center for Secure Water, Univ. of Illinois

Q:How do I know if my site is in a Groundwater Management Area?

A:DEQ’s website publishes maps of the Eastern Virginia GWMA and the Eastern Shore GWMA. If your property sits in one of those areas, any well that produces 300,000 gallons or more in a single month needs a groundwater withdrawal permit. 9VAC25-610

Q:What counts as a land-disturbing activity for erosion control?

A:Virginia law defines land-disturbing activity as any man-made change to the land surface that may result in soil erosion or has the potential to change its runoff characteristics, including the clearing, grading, excavating, transporting, and filling of land. Va. Code § 62.1-44.15:51 et seq. If your activity exceeds the local square-footage trigger, you must submit an erosion and sediment control plan.

Q:How long does it take to get a Section 404 permit?

A:The timeline varies. For activities that qualify for one of Virginia’s State Programmatic General Permits, the process with the Corps and DEQ typically takes a few months. Individual permits, required for larger or more complex impacts, have a target schedule of 150 days. DEQ

Q:Can I use a pre-1989 surface water intake without a VWP permit?

A:A surface water withdrawal that existed on July 1, 1989, is exempt from the VWP permit requirement although a permit may be required to increase the withdrawal. DEQ fact sheet However, the exemption can be contested, especially if the withdrawal affects other users or if the intake was not documented well. Public and agency scrutiny can still delay a project.

Q:What is the difference between a VWP permit and a Section 404 permit?

A:The VWP is a state permit required for any impact to Virginia’s surface waters. The Section 404 permit is a federal permit required for discharge of fill or dredged material into waters of the United States. In Virginia, many wetlands are subject to both. Because Virginia’s definition of state waters is broader than the federal definition, a project may need a VWP even when no federal Section 404 permit is required. DEQ

Q:When must I file a water withdrawal report?

A:If your project directly withdraws surface water or groundwater and the average daily withdrawal during any single month exceeds 10,000 gallons per day (300,000 gallons per month) for non-irrigation purposes, you must file an annual report with DEQ by January 31. 9VAC25-200

Q:Does the Chesapeake Bay Preservation Act apply to my Northern Virginia site?

A:Probably not directly. The Bay Act applies to the 84 Tidewater Virginia localities, which are generally east of Interstate 95. However, some Northern Virginia counties may be included. Check the official list of Tidewater localities. If your site is in one of those localities, even a small disturbance within an RPA can trigger buffer and plan requirements.

Q:What happens if I start clearing land without a VAR10 coverage letter?

A:Proceeding without required stormwater permit coverage exposes the developer to enforcement by DEQ, including stop-work orders, fines, and the obligation to retroactively install controls. Early coordination with DEQ and the local program authority is the prudent step.

The Compute Law Brief is a free weekday newsletter on the law of AI infrastructure across tax, real estate, construction, power, and deals. The big US build markets and federal law. Three minutes a morning. No paywall, and no email gate to read the blog. Subscribe if you want it in your inbox.

Junde Liu, JD, LL.M. (Taxation) candidate at UF Law. Originally published on Compute Law Blog. This article is general information and does not constitute legal advice. Reading it does not create an attorney client relationship. The reader should not act on the basis of any content here without first consulting a licensed attorney in the relevant state. Last reviewed for accuracy May 23, 2026.