If you live in Spring Hill, the biggest thing happening in your city government is something most people have never heard of: since January, the city has been under a sewer moratorium. New construction can't get sewer connections. Businesses that want to expand are being told no. Building permits are at what the city administrator calls "new lows."

Your toilet still flushes. Your bill hasn't changed. If you didn't go to council meetings, you could live here for a year and never know. But it touches almost everything the city decides right now, and it's worth understanding. To write this, I went through every board agenda packet and meeting recording from 2026 — the packets run a couple hundred pages a meeting. Here's the plain version, so you don't have to.

What the moratorium actually is

On January 5, 2026, the Board of Mayor and Aldermen passed Ordinance 25-29, which does three things:

  1. Freezes new sewer capacity. New development can't get sewer taps, which in practice means new subdivisions, new commercial buildings, and most expansions are on hold.
  2. Allows swaps. An existing building can change tenants or uses as long as the new use produces the same amount of wastewater or less. A retail space can become another retail space. It can't become a restaurant.
  3. Sets aside a reserve. The board kept 100,000 gallons per day of capacity that it can hand out at its own discretion, case by case. In eight months it has tapped that reserve exactly twice — for an endodontist office and a medical infusion center.

Nobody made the city do this, at least not directly. The moratorium is self-imposed. But it exists because of something that was imposed: a consent order from the Tennessee Department of Environment and Conservation, WPC2025-0093, over problems at the city's wastewater treatment plant.

How it got to this point

Spring Hill's water reclamation plant sits on Mahlon Moore Road and treats the sewage for a city that roughly doubled in population in fifteen years. By 2025 the plant was in trouble: notices of violation from the state, nitrogen discharges far above permitted levels, broken solids-handling equipment, and wet-weather bypasses — times when partially treated water left the plant because it couldn't keep up.

In August 2025, the mayor and the city administrator held the first special work session on the TDEC consent order. The moratorium followed in January. In June 2026, the board declared a formal emergency at the plant and authorized hauling sludge away by truck because the plant couldn't dewater it on site.

The math behind the freeze is simple. The state says the plant can't reliably treat what it already receives. Every new tap adds flow. So the city stopped adding taps.

What it means in practice

For homeowners, almost nothing changes day to day. Existing homes keep their service. You can renovate, sell, and buy like normal.

For anyone trying to build or expand, it's a wall. The clearest example came at last night's board meeting. Nelly's Italian Cafe — seventeen years in town, five to six hundred pizzas out the door on a Saturday — wants to expand into the vacant tobacco shop next door and add roughly sixteen seats. The city's design tables assign 35 gallons per day of sewer demand to every restaurant seat. More seats means more calculated flow, more calculated flow means the request fails the swap test, and staff recommended denial. Not because anyone thinks Nelly's will actually overwhelm the plant — the engineering memo estimates the real increase at about 263 gallons a day, roughly what two households use — but because the ordinance scores requests on design tables, not water bills, and staff applies the ordinance as written.

The board spent twenty minutes visibly straining against its own rule. Several aldermen said outright they want to approve it from the discretionary reserve. A vote comes at a future meeting, and it's worth watching, because it will show how the city handles every similar request from here on.

The moratorium also shows up in the city's books. Development fees have collapsed. Permits are at record lows. The city administrator has said he doesn't expect that to reverse for at least a couple of years. Growth was quietly paying a meaningful share of the city's bills, and the city has chosen to stop growing until the plant catches up.

The part that's actually going well

Here's what surprised me reviewing last night's meeting: the plant itself is genuinely improving, faster than the city expected.

In April 2025 the plant was discharging about 95,000 pounds of nitrogen a month. It's now at about 24,000. There hasn't been a bypass since June 2, despite heavy rain events. New operational leadership and outside experts have the plant running close to its original design parameters for the first time in years.

That improvement had a concrete consequence last night: the board voted 9-0 to cancel the standalone $25–28 million centrifuge project that was supposed to fix the plant's solids problem. Staff's reasoning was that the project was designed three years ago, around assumptions of a poorly run plant, and a well-run plant doesn't need it — at least not in that form. Folding the work into the larger plant rebuild instead is expected to save $10–12 million. The city was clear that this does not delay the moratorium's timeline. It's a sign the crisis phase may be ending, not a sign the freeze is.

When does it end

There's no announced end date. What exists instead is a set of milestones:

  • The Columbia connection. The nearest-term relief is a planned 23,000-foot force main down Mahlon Moore that would send about 1.5 million gallons a day to Columbia's treatment plant. When that pipe is wet, the capacity math changes.
  • The plant rebuild. The long-term fix is a roughly $320 million overhaul of the city's water and wastewater system — new reservoirs on 250 acres already purchased, a rebuilt treatment plant, and an advanced purification loop that would be the first of its kind in Tennessee. The city's target for final commissioning is May 27, 2030. The mayor keeps a countdown clock above his office door.
  • The consent order. Ultimately TDEC, not the city, decides when Spring Hill has fixed enough to be trusted with growth again.

The honest reading: the freeze in something like its current form lasts years, not months. What may loosen sooner is the edges — the discretionary reserve, and possibly capacity clawed back from allocation holders who aren't using it. The board directed staff last night to produce a report in September on how allocated capacity is actually being used, with the stated possibility of reclaiming unused allocations for businesses that are ready to build now.

What to watch next

Three things, all with dates attached. The September utilization report, which will show for the first time how much of the frozen capacity is actually being used. The Nelly's vote, which will set the precedent for every small business that comes after it. And the city's Planning and Development meeting this Thursday at 9 a.m. at City Hall, where Spring Hill Water is scheduled to give a public update on the moratorium — open to anyone, and one of the few places you can hear this discussed in plain language.

This article draws on my review of every 2026 BOMA agenda packet and meeting recording, including the meetings of January 5 and August 17, the August 17 board packet, and the August 5 State of the City address. Figures are as stated by city officials in public meetings.