The Zion Discount: What a Lower Price Doesn't Tell You About the Tax Bill

Why does a home in Zion that lists for roughly $70,000 less than the statewide median still cost about the same each month to carry?

That is the question a lot of buyers skip when they scan Lake County listings and land on Zion. The sale price looks like a genuine discount. Over the three months ending in June 2026, homes in Zion sold for a median of about $270,000, while the statewide median for Illinois in the same month sat at $343,923. On paper, Zion looks like one of the more affordable places to buy a house within an hour of Chicago's north side and the Lake Michigan shoreline.

The paper doesn't show the tax bill. And in Zion, the tax bill has a specific, traceable origin that most portal listings never mention: a nuclear power plant that shut down in 1998 and took more than half the city's tax base with it.

The Rate That Doesn't Match the Price

Every home carries two numbers that matter to affordability: the price you pay and the rate you pay it at. In most of Lake County, those two numbers move together, a lower price generally comes with a lower or comparable carrying cost. Zion breaks that pattern.

According to current property tax data compiled by Ownwell, Zion's median effective property tax rate is 3.41%. That is well above the Illinois state median of 2.33%, and more than three times the national median of 1.02%. Median annual tax bills in Zion run around $6,359, with homes in the 75th percentile paying north of $8,000 a year and the top decile clearing $9,650.

Run that rate against Zion's current $270,000 median sale price and the math gets uncomfortable fast. At 3.41%, a buyer is looking at roughly $9,200 a year, or about $767 a month, in property tax alone. Apply the Illinois state median rate of 2.33% to that same $270,000 purchase instead, and the bill drops to about $6,290 a year, or $524 a month. That's a gap of roughly $243 a month, over $2,900 a year, that has nothing to do with the house itself and everything to do with where it sits.

Here's the comparison side by side:

These are illustrative estimates based on current effective rates applied to Zion's own median sale price, not a substitute for an actual tax bill, which depends on assessed value, exemptions, and levy changes from year to year. But the direction of the gap is real, and it's large enough that a buyer comparing Zion to a similarly priced home elsewhere in the county needs to run this math before making an offer, not after closing.

Where the Rate Actually Comes From

This isn't an abstract quirk of Illinois tax policy. It has a name, an address, and a date.

The Zion Nuclear Power Station operated on 257 acres of Lake Michigan shoreline inside city limits from 1973 until its permanent shutdown on February 13, 1998. At its peak, the plant employed around 1,200 people and paid nearly $20 million a year in local property taxes, more than half of the city's entire tax base. When the plant closed, that revenue didn't get replaced. By 2016, the site was generating approximately $500,000 in annual tax payments, a small fraction of what it once contributed.

Cities don't absorb a loss like that quietly. Services still need funding, and the burden of covering that gap shifted onto the tax base that remained: homeowners. That's the direct line from a 1998 plant closure to a 2026 effective tax rate that runs a full percentage point above the state median.

Illinois did eventually build a partial offset. Under the state's 2021 Climate and Equitable Jobs Act, the operator now pays $15 per kilogram of nuclear waste still stored on the Zion site, a mechanism that ties a small ongoing revenue stream directly to the spent fuel sitting on the lakefront rather than to a plant that no longer runs. Zion has also carried state enterprise zone status, which offers redevelopment incentives aimed at drawing new commercial investment to the city. Neither has closed the gap the plant's closure opened.

What Actually Changed in 2023

For 25 years, redevelopment of the old plant site wasn't legally possible, regardless of who wanted to invest. The land was still classified as an active decommissioning project under federal oversight.

That changed on November 8, 2023, when the Nuclear Regulatory Commission released most of the 257-acre former plant site for unrestricted use. In practical terms, the NRC determined that residual radiation across the majority of the site fell below its regulatory limits and terminated the power reactor licenses covering that land. Constellation Energy, which now holds the Zion assets Exelon once operated, is free to use that portion of the site for any application it chooses. Only the spent fuel storage facility, a comparatively small footprint holding the plant's dry casks, remains under NRC licensing and oversight, and will stay that way until a permanent federal storage site exists somewhere else in the country.

This is the detail that matters for anyone thinking about Zion's tax trajectory over the next decade, not the next year. The legal barrier to commercial or residential redevelopment of most of the former plant site is gone. Whether an actual project materializes, and whether it ever restores meaningful tax revenue, is a separate and much slower question. Nothing about the November 2023 release guarantees new development, and nothing in current public records points to a specific project underway on the released acreage as of this writing. What it does mean is that the ceiling on what that land can become just moved for the first time in a quarter century.

What This Means If You're Comparing Zion to Somewhere Else

None of this means Zion is a bad buy. It means the comparison has to include the carrying cost, not just the sticker price.

A few things worth checking before you write an offer:

1. Ask your lender or your agent to pull the actual current tax bill for the specific parcel, not a citywide average. Zion's rate varies by school district boundary and special assessment area, and the number on last year's bill is the real starting point.
2. Confirm what exemptions the current owner has in place, such as the general homestead exemption, and whether those carry over or reset with a new owner.
3. If the assessed value looks out of step with a recent sale price, know that Zion Township's assessor's office values property at 33.33% of market value under Illinois Department of Revenue rules, and that residential owners can appeal directly to the Lake County Board of Review without hiring an attorney.
4. Factor the monthly tax difference into your budget the same way you'd factor in a rate difference on a mortgage. A few hundred dollars a month changes what a buyer can qualify for just as much as a quarter point on an interest rate does.

What a Zion buyer does still get for that tax rate is real. The Zion Park District maintains more than 825 acres of parkland and open space across 23 neighborhood parks and six major facilities, including two golf courses, a fitness center, and a community pool. Lakefront access, a lower entry price, and a shorter commute into the northern suburbs are still on the table. The point isn't that Zion is overpriced for what it offers. It's that the number worth comparing across Lake County isn't the sale price alone. It's the sale price plus what the rate actually costs you to hold it.

A Short FAQ

Is Zion's property tax rate the highest in Lake County? Current comparative data across every Lake County municipality wasn't part of this research, so that specific ranking can't be confirmed here. What's documented is that Zion's effective rate of 3.41% sits meaningfully above both the Illinois state median and the national median, and that the gap traces to a specific, dated event rather than a general regional pattern.

Could the tax rate come down if the old plant site gets redeveloped? It's possible in theory. New commercial or industrial use of the released acreage would add to the tax base for the first time since 1998. But the site was only cleared for unrestricted use in November 2023, and no specific redevelopment project on that land was identified in current public records at the time of writing. This is a multi-year question, not a near-term one.

Does the spent fuel still stored on site affect property values nearby? The storage facility remains under NRC oversight and is a fixed, monitored feature of the site until a federal or offsite storage solution exists elsewhere. Buyers with specific questions about proximity to the storage facility should raise them directly during due diligence rather than relying on general assumptions.

If you're weighing a purchase in Zion against another Lake County suburb and want the real monthly numbers run for a specific address, Deena Allie can walk through the current tax bill, the assessment history, and what it actually means for your budget before you write an offer. Schedule a consultation to get the full picture, not just the median.