Lake Anna Water Level Update: Where We Stand, and the Data Center Question

LAKE ANNA WATER LEVEL UPDATE · WEEK OF SEPTEMBER 22, 2026

The lake is holding about 1.9 feet below full pond after a record-dry year. Here is what the permits and published numbers actually say about Louisa County's data centers and our water.

By Michael Boyce II, The M Group at Real Broker, LLC

Lake Anna sat at roughly 248.1 feet above mean sea level in the most recent reading, about 1.9 feet below the 250-foot full pond target Dominion Energy manages the lake to. The level has been essentially flat for the better part of three months.

That is the number. The more interesting story is that the number has barely moved since early July, and that it held through what turned out to be one of the driest stretches Virginia has recorded.

The second question we keep getting, in person and in our inbox, is whether the data centers going up in Louisa County are pulling water that would otherwise be in the lake. That deserves a real answer built on permits and published figures rather than on a comment thread. It is the second half of this blog.

Everything below is sourced and linked. Where our own arithmetic is doing the work, we show the conversion factors so you can check us. If we have something wrong, we want to know.

Where the lake stands

• Full pond target: 250.0 ft above mean sea level
• Recent reading: about 248.1 ft
• Below full pond: about 1.9 ft
• 7-day trend: stable
• 30-day trend: stable
• Early July 2026: about 248.2 ft
• Louisa County drought status: no drought category, as of the latest U.S. Drought Monitor

Put those last two together. In early July we reported the lake at about 248.2 feet and falling roughly an inch a day during the worst of the dry spell. It is now late September and the lake is at about the same place. It stopped falling.

The reason is rain. August came in about 1.36 inches above normal in this area, one of the wetter Augusts in more than a century of record, and the U.S. Drought Monitor now shows Louisa County out of drought entirely. Earlier in the year, Virginia was working through what was described as its second-driest water year on record, with a large majority of the state in some drought category at the end of July.

What actually controls the level

Three things move Lake Anna up and down, and only one of them is in anybody's control.

Inflow. Rain falling on the watershed upstream and running into the North Anna River and the creeks that feed the lake. This is by far the biggest lever and nobody operates it.

Evaporation. A 13,000-acre water surface in a Virginia summer loses a great deal of water to the sky. For scale, one inch of water across the whole lake is roughly 353 million gallons. Even a tenth of an inch a day is about 35 million gallons a day going up rather than downstream. This is the single largest term most people never think about.

Releases at the dam. This is the managed lever. Under the state discharge permit for North Anna, Dominion is required to provide a minimum instantaneous release of 40 cubic feet per second from the dam at all times, with one exception: when the lake falls below 248 feet, releases may be stepped down in roughly 5 cfs increments, at least 72 hours apart, to a floor of 20 cfs. Downstream users have to be notified in advance, and releases step back up to 40 cfs once the lake recovers above 248 feet.

That 248-foot threshold is worth remembering, because it is essentially where the lake has been sitting all summer. Forty cubic feet per second works out to roughly 26 million gallons a day leaving the lake by permit. Hold that figure. It matters for the next section.

One point people get wrong: the power station itself is not draining the lake. North Anna circulates roughly 2 million gallons a minute for cooling, but that water is borrowed, not consumed. It goes through the condensers, cools in the private lagoons of the Waste Heat Treatment Facility on the warm side, and comes back to the lake. The real consumptive loss from the station is the extra evaporation off a warmed water surface, not the flow rate through the plant.

Now the data centers

Here is what is actually documented, with the sources, and then an honest read on what it does and does not mean for the lake.

What is being built

Amazon Web Services has two data center campuses in Louisa County, the Northeast Tech Campus and the Lake Anna Tech Park. A third and considerably larger campus has been proposed on roughly 1,370 acres north of Northeast Creek Reservoir, with up to 7.2 million square feet of buildings and on-site substation capacity that would exceed the output of the North Anna station itself. That third campus moves through conditional use permitting at the county level, which means public hearings.

Where their water comes from

This is the part that answers the question most people are actually asking. According to Louisa County's own published answer, raw water for the data centers comes from the Northeast Creek Reservoir, which has a stated safe yield of 3.2 million gallons per day. The county states plainly that the method "will not utilize groundwater, so it does not contribute to any increased demand for groundwater," and that AWS pays for the water and sewer infrastructure serving both campuses.

So the water table concern, at least as to these campuses, is not the mechanism. They are not drilling into the aquifer that your well draws from. They are drawing surface water from a county reservoir.

The connection that is real

That said, it would be dishonest to stop there and say the lake is unrelated. Northeast Creek Reservoir sits in the same watershed, and Northeast Creek runs into Lake Anna. Water held back or drawn out upstream is water that does not arrive downstream. That is not a theory. That is just how a watershed works, and it is a fair thing for a lake resident to want accounted for.

Some of it does come back. Permitting documents describe the Northeast Tech Campus discharging up to 460,000 gallons a day of treated cooling water into Northeast Creek, and a draft permit for the Lake Anna Tech Park allowing up to 280,000 gallons a day into Sedges Creek. Both creeks feed Lake Anna. Cooling water that is discharged rather than evaporated returns to the same system.

The numbers, and the gap in them

Reporting on the third campus application put average daily water use across the AWS campuses at roughly 660,000 gallons a day, with peaks that could exceed 7 million gallons a day on the hottest stretches of summer. Amazon has said its evaporative cooling systems run only about 4 percent of the year, with outside air doing the work the rest of the time. Separately, reporting on four Virginia counties that have committed water to Amazon put Louisa's figure at about 7 million gallons a day, part of a four-county total near 19.6 million.

That is the number people are arguing about, and it deserves to be stated next to the reservoir's capacity rather than on its own. Northeast Creek Reservoir's stated safe yield is 3.2 million gallons a day. A peak-day draw above 7 million gallons is more than double that. The county's position is that at full build-out, average daily demand plus projected potable needs still leaves a substantial buffer against safe yield. Both of those statements can be accurate at the same time, because one describes an average and the other describes a peak. Whether peak days are capped in the permits, or only averages are, is a legitimate question and it is the one we would ask at a hearing.

Putting it against the lake

Now the arithmetic, because scale is what usually settles this kind of worry. These are straightforward conversions from the figures above, not projections, and you are welcome to check them.

• One inch across the whole lake: about 353 million gallons
• Dam release at 40 cfs, the permit minimum: about 25.9 million gallons a day, or about 0.073 inch of lake per day
• Data center peak-day figure: about 7 million gallons a day, or about 0.020 inch of lake per day
• Data center average-day figure: about 660,000 gallons a day, or about 0.002 inch of lake per day
• Treated discharge back into the creeks: up to about 740,000 gallons a day, returning to the same system

Read down that list. At the average figure, a full month of data center water use is on the order of six hundredths of an inch of lake elevation, and the permitted discharges alone are larger than the average draw. At a sustained peak, which is not the documented operating pattern, a month would be in the neighborhood of six tenths of an inch. The dam release required by permit moves more water than the peak figure does, every single day, and summer evaporation moves considerably more than that.

So is this worth paying attention to?

Yes, but not for the reason that gets the most airtime. The quantity question is small against the size of this lake. Two other things are more substantial.

Water quality, not water quantity, is the live issue. The DEQ public hearing held in Louisa in June was about what is in the discharge, not how much is taken out. DEQ's position is that the cooling water never contacts IT equipment, is treated before release, carries limits on metals such as zinc and copper, and is capped at a discharge temperature of 89.6 degrees. Documented pretreatment chemicals include sodium hydroxide, sulfuric acid, sodium bisulfite and polyaluminum chloride. The open item is PFAS. As Virginia Mercury reported, neither Virginia nor EPA currently requires data center discharge to be tested for PFAS, and recent state legislation requiring PFAS testing for wastewater plants, airports and firefighting operations does not cover data centers. The draft Sedges Creek permit does include language allowing that requirement to be added later.

Cumulative build-out is the thing to watch, not any single campus. One campus against a 13,000-acre lake is arithmetic noise. Three campuses, plus whatever follows, drawing from a reservoir with a 3.2 million gallon per day safe yield, is a different question, and it is a question about Louisa County's drinking water system as much as about the lake. The county water authority issued mandatory restrictions during the June dry spell. That is a municipal supply story, separate from the lake's elevation, and worth following on its own.

What protects the lake level

Four things, in rough order of strength.

The reservoir itself. Thirteen thousand acres of stored water is an enormous buffer. This summer demonstrated it against the rest of the state's reservoirs.

Dominion's own need for it. The lake exists to cool a nuclear station. Dominion's operational interest and lake residents' recreational interest point the same direction, which is not true at every lake in this country.

The release permit. The 248-foot trigger that allows reduced downstream flow is, functionally, a lake-preserving mechanism. It exists precisely so that a drought does not drain the reservoir to protect downstream flows.

Public permitting. Every new withdrawal and every new discharge runs through DEQ permitting and county land use approval, in public, with comment periods. That is where residents have actual standing, and it is a great deal more useful than arguing about it online. Worth noting: the June DEQ hearing limited speaking to people who had already submitted written comments, which frustrated a lot of attendees. The lesson is to submit written comment during the comment window, every time, whatever your position.

If you own on the water

Practical translation. A lake sitting 1.9 feet below full pond is a depth issue in shallow coves and at the ends of fingers, not a lake-wide problem. Depth at your particular dock, especially at winter drawdown, is the variable that matters and it is measurable. If you are buying, measure it before you write. If you are selling, know it before a buyer asks. We have written separately on what you can build on the shoreline and whether a dock conveys with the house.

Lake Anna touches Louisa, Spotsylvania and Orange counties. The data center activity described here is Louisa County specifically. County rules, water authorities and land use processes are not the same across the three, so do not assume a Louisa answer applies to your parcel if you are on the Spotsylvania or Orange side.

We want to hear from you

This is an emotional subject for a lot of people who live here, and for good reason. It is also a subject where the facts are largely public, and where the loudest version of the story is usually not the most accurate one in either direction.

So tell us what you are seeing. Are you noticing something at your dock that the gauge is not capturing? Have you been to a county meeting or read a permit we should be looking at? Do you think we have a number wrong, and can you point us to a better source? We will correct anything we get wrong and say so plainly.

What we are not going to do is trade in speculation about anyone's motives. We would rather publish a boring, correct blog than an exciting, wrong one.

Why we reported it this way

We could have written the version of this blog that gets shared the most. It writes itself: the lake is down, the data centers are going in, connect the two, collect the comments. It would have taken twenty minutes and it would have been wrong.

Here is what we actually did instead, because the difference is the whole point.

We read Louisa County's published answer on where the raw water comes from rather than repeating what people say it says, and it turned out to contradict the most common version of the story. We pulled the 40 cubic feet per second release requirement and the 248-foot trigger out of the state discharge permit itself. We converted flow rates into inches of lake elevation ourselves and published the conversion factors next to the result. When the peak-day figure and the reservoir's safe yield did not line up, we printed both numbers and named the gap instead of quietly using whichever one supported a tidier conclusion. And when the research undercut the premise we started with, we changed the blog, not the facts.

What that looks like when it is your money

The lake version of this blog has a real estate version, and it is not a metaphor. It is the same work.

Depth at your dock gets measured, not estimated. A sounding at the end of the pier, and an honest read on what happens at winter drawdown, rather than a summer impression and a hopeful adjective in the listing.

Shoreline classification and dock permit status get pulled before anyone plans a lift. Not the neighbor's dock as evidence. The file on your parcel.

Comps get filtered by which side of the lake they sold on before they are ever put in front of a seller, because averaging the private side and the public side together produces a number that is wrong for both.

Covenants get read line by line. "The HOA allows rentals" is a sentence, not a finding. The finding is in the recorded document, the amendment provisions, and who has the votes.

And when the number is not there, we say the number is not there. That is the least popular part of the job and the part that matters most. An agent who will not tell you something you do not want to hear about a blog is not going to tell you something you do not want to hear about your price.