Teller County Septic Rules Are About to Change. Here's What Property Owners Need to Know.

Teller County Septic Rules Are About to Change. Here's What Property Owners Need to Know.

Colorado already moved. Teller County is next — and if you own property here, the time to understand this is before the hearing, not after.

Colorado's updated Regulation 43 took effect statewide on June 15, 2025. Teller County is now finalizing its local OWTS standards to match or exceed that new baseline, with a public hearing scheduled for May 7, 2026. Once adopted, these rules become the floor. The county may go stricter from there.

One of the clearest changes: cesspools — those old, unlined pits that predate modern septic standards — are no longer something you can quietly hand off to a buyer.

Under the new rules, if a transfer-of-title inspection finds a cesspool on the property, it isn't supposed to stay in service. The expectation is that the property comes into compliance with a real, permitted OWTS — before or after closing, depending on how the deal is structured. The only exception is when the site is so constrained that a variance or repair route has to be pursued instead.

That's a meaningful shift. Before, cesspools on existing properties could change hands with a shrug. Now, they're a deal item.

Most property owners assume that if a system has "worked" for decades, it's fine — and that any future buyer is taking it as-is. That's how it felt for a long time.

These new rules don't care how old the installation is.

There's also a change-of-use trigger that a lot of people haven't thought through yet. If a property changes how it's being used — a cabin that becomes a short-term rental, a home with more sleeping capacity than it was sized for — the septic may need to be revisited even without any new construction. Under the revised rules, counties can now size systems based on actual occupancy load, not just legal bedroom count.

The old mental model of "same building, same septic" doesn't hold anymore.

 
If you own property in Teller County and you're thinking about selling in the next few years, the smart move is to understand exactly what system you have — not what you assume you have.

Know whether it's a permitted, engineered system or something older that pre-dates modern standards. If you don't know, find out before a buyer's inspector does. That's a much better conversation to have on your timeline than theirs.

If you're planning a new build, addition, or converting a property to a rental use, expect more on the front end: more detailed soils work, more documentation, more engineering involvement on difficult sites, and more likelihood that your system will require ongoing maintenance and inspections after install.

For mountain lots specifically — the rocky soils, shallow bedrock, and slow-draining ground that are completely normal in Teller County — these changes mean the design process is going to reflect reality more accurately. That's not a bad thing. It just means the days of breezing through a soils report on a difficult site are over.

 
The simplest way I can put it:

The old question was: "Can we get a septic approved for this lot?"

The new question is: "Can we prove, with real soils data, proper design, and documentation, that this lot can support this specific use?"

That's a real shift — and whether you're buying, selling, or building in Teller County, it's worth understanding before it surprises you.

 
Peak DirtWorks is a licensed septic installer serving Teller and Park County, Colorado. Family-owned, locally rooted, voted Best of Teller. www.peakdirtworks.com