The Sewer Line That Explains Why Summerset Is Building Again
In the summer of 2024, crews spent weeks boring a wastewater main under Interstate 90 on the east side of Summerset. It wasn't glamorous work, and it didn't make for much of a photo unless you count the groundbreaking ceremony that drew more than a hundred people to a dirt lot that would become the Highlands at Norman Ranch. But that pipe is the reason Summerset's housing market looks different this fall than it did two years ago, and it's a better explanation for the numbers than anything you'll find on a listing sheet.
If you've pulled up Summerset's stats recently, you've probably noticed homes sitting longer and selling for less than they were quoted at. That's true. It's also not the story people assume it is.
For years, Summerset's wastewater treatment plant was maxed out. Not close to capacity. At it. City officials confirmed to KOTA-TV in early 2023 that the plant had been at capacity long enough that new residential and commercial hookups simply weren't possible in parts of the city. Mayor Melanie Tarno put it plainly at the time, saying the city had "been at capacity for quite some time," and that the expansion project underway would double the plant's capacity so Summerset could keep growing on both the residential and commercial side.
That's an unusual problem for a growing suburb to have. Land wasn't the constraint. According to Summerset's comprehensive plan, more than half of the vacant land inside city limits is already zoned General Commercial, and much of it has sat undeveloped for years. The bottleneck wasn't zoning maps or available acreage. It was physical plumbing capacity, and until that got fixed, the city couldn't approve the kind of large-scale residential development that would have added real competition to the resale market.
The fix came through the South Dakota Department of Agriculture and Natural Resources, which approved a Clean Water State Revolving Fund loan of roughly $5.9 million plus an ARPA grant of about $3.6 million to expand the plant and double its treatment capacity. Construction on that expansion broke ground in February 2023.
With plant capacity freed up, Vanocker Development and Norman Ranch Subdivision LLC moved forward on the Highlands at Norman Ranch, a master-planned community on more than 300 acres on Summerset's east side. The project broke ground in July 2024 and is being built by TNT Homes & Construction of Rapid City, with financing led by Pioneer Bank and a group of Black Hills investors.
The first phase includes well over 100 homesites, a mix of single-family homes and townhomes, with new home prices starting in the upper $300,000s. Kyle Treloar of Vanocker Development described the location as strategic, noting it's "close to both Rapid City and Sturgis." Vanocker partner Megan Kingsbury tied the project directly to workforce housing needs along the I-90 corridor, pointing to the ongoing expansion at Ellsworth Air Force Base as part of what's driving demand. The private infrastructure investment required to serve the site, including that wastewater main crossing under I-90, ran just under $10 million, described at the time as one of the largest private infrastructure builds the state had seen in years.
That's the piece that changes the math for anyone shopping in Summerset right now. For most of the city's history since incorporating in 2005, if you wanted to live here, your options were whatever resale inventory happened to be on the market. Now there's a real new-construction alternative landing at the same time.
| Resale (existing homes) | New construction (Highlands at Norman Ranch) | |
|---|---|---|
| Median sold price | $414,726 as of August 2026, down 9.35% year over year | Starting in the upper $300,000s |
| Days on market | Rose from 66 to 93 days, comparing the three months ending May 2026 to the same period a year earlier | First homesites delivering in phases starting 2025 |
| Median list price | $459,000 to $465,000 across listings tracked in Feb. through June 2026 | Set by builder, not yet subject to resale competition |
The gap between what resale sellers are asking and what buyers are actually paying is worth sitting with. Listings are still priced closer to what the market looked like during the years when Summerset had almost no competing new-construction supply and homes moved fast. In one Summerset subdivision, homes that sold in 2024 spent an average of just 16 days on market and closed near 98% of list price. That's a market with no alternative for buyers to consider. It doesn't look like that anymore.
Longer days on market usually gets read as a warning sign. In Summerset's case, it's closer to a market catching up to a normal rhythm after years of being artificially constrained. When the only path into Summerset was resale inventory, buyers who wanted to be in this specific stretch of the Black Hills foothills had to compete for whatever came up, on whatever timeline the seller set. Now that new construction is actually available at a lower entry price, buyers have room to compare, negotiate, and wait for the right fit instead of the first fit.
That shows up in the numbers as softer sold prices and longer time on market. It doesn't show up as fewer people wanting to live here. The Ellsworth Air Force Base expansion and the I-90 corridor growth that Vanocker cited as reasons for building here in the first place haven't gone anywhere. What's changed is that sellers of existing homes are now pricing against a builder down the road instead of pricing against nothing.
If your search is focused on the older Sun Valley Estates section in north Summerset, it's worth asking sellers directly about basement and drainage history. The U.S. Geological Survey partnered with the City of Summerset on a groundwater study in that specific subdivision after high-precipitation years, including 2019, caused elevated groundwater levels in the unconsolidated soil there, which led to documented issues with stormwater systems, sewer infrastructure, and basements. It's a known, studied condition tied to the terrain in that particular part of the city rather than a citywide issue, and it's the kind of question a seller should be able to answer clearly.
Is Summerset's wastewater capacity problem still a concern? No. The plant expansion that broke ground in 2023 was designed to double treatment capacity, and it's what allowed the city to sign off on large developments like the Highlands at Norman Ranch in the first place.
Is new construction actually cheaper than buying existing in Summerset right now? Based on current pricing, yes, at least at entry level. Highlands at Norman Ranch homes start in the upper $300,000s, while resale listings across the city have been asking $459,000 to $465,000 through the first half of 2026, with sold prices coming in below that.
Does longer time on market mean something is wrong with a listing? Not necessarily. Given that Summerset spent years with almost no new-construction competition, a longer market cycle now often just means buyers are taking the time to compare options that didn't exist two years ago.
If you're trying to figure out whether a Summerset listing is priced against last year's tight market or this year's wider set of choices, that's exactly the kind of read I do for clients before they write an offer. Reach out to Cheyenne McGriff and I'll walk you through what's actually moving in this market right now.
Get assistance in determining current property value, crafting a competitive offer, writing and negotiating a contract, and much more. Contact Cheyenne today to discuss all your real estate needs!