Peosta Data Center Ordinance and New Construction: What to Know

According to KCRG, on September 16, a developer stood in a packed room at Peosta City Hall and told the city council he was prepared to wait a year for an ordinance to get written. A few miles down the same four-lane stretch of Highway 20, crews were pouring foundations on the newest phase of lots in Thunder Valley Estates, a subdivision that didn't exist a decade ago and is now on its fourth release.

Both things are true about Peosta right now. The city is filling in with new houses faster than almost anywhere else in the Dubuque area, and it's also in the middle of an unresolved fight over whether a different kind of development, a hyperscale data center, belongs on the same corridor. If you're comparing Peosta to Asbury or Epworth on price and lot availability alone, you're missing the half of the story that won't show up in a listing.

What's Actually Being Proposed

The developer at that September meeting was Jim Conlan, working alongside a company called Karis Critical. Conlan and Karis already own land south of Highway 20 in Peosta and want to build there. The proposal first surfaced quietly. Peosta city leaders said they were approached informally back in June, and the council's first real discussion happened at a work session that same month, not long after Dubuque County supervisors had approved their own one-year, countywide pause on data center development following public opposition. Peosta officials made a point of noting they're a separate municipality from the county and would need their own rules rather than borrowing the county's.

That distinction matters, because it means Peosta has spent the months since building its own process from scratch: researching how other cities have written data center ordinances, reviewing concept plans the developer submitted in August to help inform what regulations should look like, and holding a moratorium that gives the city time to figure out what it wants before anyone can build.

The Timeline, As Of Now

Here's where things actually stand. Peosta enacted a six-month moratorium on data center development earlier this summer. That pause is set to expire December 20, 2026. At the September work session, council members said they plan to extend it another six months while they hire a consultant to help draft the actual regulations, which means no ordinance exists yet, only a framework of topics the council is working through: water use, power demand, noise, construction and operations, and how the fiscal side would work.

A recent survey found 87 percent of respondents opposed any data center development in Peosta, and the room at that September meeting reflected it. Conlan told the council he supports strict rules rather than none:

As KCRG reported, "We're not going away, so if the ordinance takes a year, it takes a year."

City leaders have said they don't want to offer tax incentives to bring a data center in, and Alliant Energy has stated publicly that the developer, not existing ratepayers, would be responsible for any power infrastructure upgrades the project required. Council Member Jeff Buxton put the city's position plainly at the same meeting, as KCRG reported: "We work for the citizens of Peosta."

Settled Versus Still Being Decided

For anyone trying to track this before making a purchase decision, it helps to separate what's confirmed from what's still open.

Nothing here is resolved. That's the point. A buyer closing on a lot this fall is closing before the rules exist.

Why This Same Corridor Twice

It's worth asking why a subdivision and a hyperscale data center would both want the same few miles of road. The answer is the same infrastructure that makes Peosta attractive for new homes.

Highway 20 is four lanes through Peosta and puts Dubuque about 12 miles away, close enough for a daily commute but far enough to feel like its own place. The city's industrial park, sitting right along that highway, already employs an estimated 2,000 people across companies that include Mi-T-M, Michelin, Berry Global, and FedEx Freight. Northeast Iowa Community College's main campus is in Peosta too, recently finishing a $30 million renovation and adding baseball, softball, cross country, and dance programs in 2025 on top of roughly 1,525 enrolled students.

None of that changed because a data center got proposed. It's the same reason builders picked this stretch of road for Thunder Valley Estates, Oak Park, and Royal Oaks in the first place: highway access, room to grow, and a workforce base already in place. A developer looking for power, land, and connectivity is drawn to the exact same list of advantages a homebuilder is. That overlap is why this fight is happening here and not somewhere without an industrial park or a four-lane highway.

What The Permit Numbers Show, Separately

The residential side of Peosta's growth is its own story, and it predates the data center conversation entirely. The city's own figures show 23 building permits issued for new homes in 2024 and 16 more in 2025, with two subdivisions carrying a combined 130 lots under construction as of early this year. New-construction listings this fall have carried a median asking price of around $480,000, with typical listings spending about 47 days on the market before going under contract.

That's a meaningful amount of new supply arriving at once, across multiple builders working the same subdivisions. Nadermann Development has been building in Thunder Valley Estates. Steve Stackis Construction has worked in Oak Park. Boyko Custom Homes has built in Thunder Valley Estates' fourth phase. Different builders, similar finishes: quartz counters, walkout basements, open kitchens, the kind of spec that's become standard across new construction in this price range here.

Some of these subdivisions carry their own homeowners associations, and they don't all have the same track record. Thunder Ridge Estates has run its own HOA since 2010. Newer phases in Thunder Valley Estates don't have that history yet, which is a separate but real question to ask a builder or seller before closing, regardless of anything happening with the data center ordinance.

What This Means If You're Comparing Neighborhoods

If you're weighing Peosta against other Dubuque-area suburbs, the price and days-on-market numbers tell you what's happening this month. They don't tell you whether the land two miles down Highway 20 will host server farms in two years, what an eventual ordinance settles about water and power demand, or how a specific lot relates to the parcel Conlan and Karis already own.

That doesn't mean avoid Peosta. It means build a few extra questions into your timeline before you close: where does this lot sit relative to the site south of Highway 20, what does the city's own data center information page say about the ordinance's current draft, and is the council meeting schedule likely to produce a vote before or after your closing date. Alliant's statement that the developer would cover infrastructure costs addresses one common worry directly, which is worth knowing rather than assuming.

A Few Questions Worth Asking Before You Sign

Does the moratorium affect home-building permits? No. The pause covers data center development specifically. Single-family and subdivision permits are unaffected and continue to move through the city's normal process.

Where exactly is the proposed site? Land south of Highway 20 that Jim Conlan and Karis Critical already own, according to reporting on the September work session.

When will Peosta have a final ordinance? No confirmed date. The council plans to hire a consultant to help draft the regulations, and the developer has said he's prepared to wait as long as a year.

If you're watching a specific lot in Peosta or trying to figure out how this ordinance fight fits into your timeline, Jim Dix can walk through what's actually settled before you write an offer. Let's connect.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.