If you own a septic system on Eaglewood Drive, Lakeview Drive, Karen Drive, Russell Lake Drive, Mulberry Street, or Colony Court in Zionsville, the day your tank fails is not the day you decide how to fix it. That decision was made when the Town ran a sewer main down your street. Once sanitary sewer service reaches a property, Boone County Health Department will not permit a full septic system replacement there. Minor repairs get reviewed case by case. A full rebuild does not.
That single rule is the part of Zionsville's Sewer Extension Project that rarely makes it into a listing conversation, and it is the reason this post exists. The Town is not requiring anyone to hook up today. But it has quietly removed the fallback option that makes septic ownership low-risk in the first place: the ability to just replace a failed system with another one.
The geography this actually touches
The project targets six identified areas where homes still run on individual septic systems despite sitting close to Town sewer infrastructure. The streets named in the Town's own project materials include Eaglewood Drive, Lakeview Drive and Karen Drive, Russell Lake Drive East and West, and Mulberry Street near Colony Court. If you are shopping in one of these pockets, or your own home sits there, this is not a hypothetical.
Outside these zones, plenty of Zionsville and Boone County homes remain comfortably and legally on septic with no timeline pressure at all. The rule only applies once a public sewer main is actually in the ground and available for connection nearby. That is a narrower slice of the market than "anywhere with a septic tank," but it is a real one, and it is exactly the kind of detail that will not show up on a listing sheet.
What connection actually costs
The Town has been direct about the money, and it is worth laying out in full because the number that matters is not the biggest one. It is the fact that there are two of them.
| Cost item | Amount |
|---|---|
| Grinder pump unit, home-to-main piping, and septic tank decommissioning (contractor-quoted) | $15,000 to $20,000 |
| Town sewer availability fee, paid at connection | $4,000 |
| Town permit fee | $25 |
That puts a typical tie-in somewhere between $19,025 and $24,025, and every property is different enough that the Town itself tells owners to get individual contractor quotes rather than treat that range as fixed.
Here is the detail that reframes the whole decision. The Town's own outreach to local contractors found that the grinder pump and piping work costs about the same as installing a new septic system from scratch. In other words, connecting to sewer is not meaningfully more expensive than the septic repair a homeowner would have paid for anyway. What changes is who gets paid, and how many parties. A septic replacement is one check to one contractor. A sewer conversion is a contractor invoice plus a separate $4,000 check to the Town, due at the moment of connection, with no ability to shop that fee around.
So the real cost of this rule is not the dollar figure. It is the loss of optionality. A homeowner outside these zones who has a septic failure gets to choose their contractor, their timeline, and their financing. A homeowner inside one of these zones with a main already in the street loses the cheapest branch of that decision tree the moment the system fails.
Connection is optional, until it isn't
Indiana law lets a municipality require connection for any property within 300 feet of a sewer main. Zionsville has chosen not to exercise that authority on these extensions, so hookup today is voluntary for anyone whose existing septic system is still functioning. That is the calm version of this story, and it is the one most homeowners in these areas are currently living.
The other version arrives the day a system fails. At that point Boone County Health Department's rule takes over and a full septic rebuild is off the table, which makes the "optional" hookup effectively mandatory. The Town is not forcing the choice. Physics and plumbing code are.
There is also a piece of the process that matters for anyone doing pre-listing cleanup or buying a home where a septic system was already abandoned. Per the Town's requirement, any decommissioned tank has to be collapsed with rock or sand and completely backfilled, specifically so it does not rust out later and open a crater in the yard. A seller who paid a contractor to disconnect a tank without doing this correctly has handed the next owner a landscaping surprise with a plumbing cause.
Danny Gerald Jr., a Zionsville-based licensed plumber with the company 317 Plumber and Indy Water Heater and Softener, works these tie-ins regularly and lives in one of the affected neighborhoods himself. Describing the queue for this kind of work, he put it plainly:
"As of right now, we're about 45 days from being able to tie on the first property."
Lead times like that will shift with contractor demand and season, but the underlying point holds. This is not a same-week repair. Anyone managing a septic failure in one of these zones needs to budget for weeks of scheduling on top of the cost itself.
Why the pressure is likely to build, not ease
Zionsville's wastewater system gives some context for why this rule exists and why it is unlikely to loosen. The Town's treatment plant took its first rate increase since 2010 with a 28 percent jump, driven by rising operating costs and the need to fund equipment upgrades. Public Works Director Lance Lantz has been direct about the direction the Town wants to move, saying the goal is to make sure there are alternatives to septic available and to focus on eliminating the older systems still in use.
None of that changes the math on today's $19,000 to $24,000 range. But it is a reasonable signal that the Town's posture toward septic-to-sewer conversion in these zones is more likely to tighten over time than to relax.
What this means if you are buying or selling here
If you are looking at a home on septic in one of these six areas, the system's current condition matters more than it would elsewhere in Boone County. A septic system with visible age or a marginal inspection is not a routine repair candidate here. It is a $20,000 decision waiting on a failure date nobody can predict.
If you are selling a septic home in one of these streets, waiting for a buyer's inspector to raise the sewer main issue is the expensive way to find out about it. Getting ahead of the condition of your system, and confirming whether any prior tank abandonment on the property was done to the Town's collapse-and-backfill standard, gives you room to price and negotiate on your own terms rather than reacting to someone else's inspection report.
A few direct questions
Does every Zionsville home on septic face this rule? No. It applies specifically to properties in the identified sewer extension zones where a Town main is now available nearby. Homes on septic elsewhere in Zionsville and Boone County are not affected by this particular restriction.
Can I keep my septic system if it is working fine? Yes, for now. The Town has made connection optional rather than mandatory, and the rule only forces the issue if your existing system needs full replacement.
How do I find out if my street is on the list? The Town of Zionsville's Sewer Extension Project page names the affected streets directly, and it is worth checking against your specific address rather than relying on neighborhood reputation, since the boundaries follow sewer main routing rather than subdivision names.
If you are weighing a purchase in one of these neighborhoods, or you are sitting on a septic system in one and wondering what it actually means for your timeline and your equity, that is exactly the kind of local detail The Spillman Group walks through with clients before an offer gets written, not after. Schedule a free consultation and we will help you sort out what applies to your specific address before it becomes a surprise at inspection.
