In Pagosa Springs, the Newer Septic System Might Be the Riskier One

Most people assume the opposite. An older septic system means more wear, more scrutiny, more reason to ask questions before closing. A newer one gets a pass. In most of the country, that assumption holds.

In Archuleta County, for one specific five-year window, it doesn't. A septic system installed anywhere from 2018 through 2023 can be young enough to skip the standard pre-sale inspection and still carry a design flaw the county itself has confirmed. That's not a hypothetical. It's the finding that led the Archuleta County Board of Health to rewrite its wastewater regulations this year, and it changes what a buyer or seller in Pagosa Springs should actually be checking before they sign.

What "Passed" Actually Means at Closing

Every property in Archuleta County served by an on-site wastewater treatment system, the technical name for a septic system, needs a certified inspection and a signed Acceptance Document from the county's Water Quality Department before the sale can legally close. That requirement has been in place since 2019, and it isn't going anywhere. A certified inspector checks the tank, the distribution box, and the drain field, then submits the report so the county can issue the paperwork that makes the transfer legal.

There's one carve-out. If the entire system was installed within the last four years and the closing falls inside that window, the county can issue a waiver letter exempting the sale from the standard inspection. On paper, that's a reasonable convenience. A four-year-old system hasn't had time to fail.

The problem is that "hasn't failed yet" and "was built correctly" aren't the same question, and for a specific stretch of permits, the county now knows the answer to the second one was sometimes no.

The Five Years Nobody Was Checking

From 2018 through the end of 2023, septic permitting across La Plata, Archuleta, and San Juan counties was handled by a regional agency, San Juan Basin Public Health, before it dissolved and permitting authority moved to each county's own health department. During that stretch, the Archuleta County Board of Health later learned, the agency had been approving a design shortcut that didn't match state rules.

Colorado's Regulation 43, the state standard for septic design, allows engineers to shrink the size of a system's soil treatment area by 30 percent if the field uses proprietary distribution products and at least 90 percent of that area is covered by them. San Juan Basin Public Health allowed the size reduction without requiring the 90 percent coverage that makes the smaller footprint safe. The agency also permitted more spacing between effluent chambers than the state allows.

Archuleta County's Water Quality Manager, Kevin Torrez, told the Board of Health that a sample review turned up a pattern. Some local engineers built systems the state's way regardless of what the old agency would accept. Others didn't. Two of the six or seven engineers who design septic systems in the county had been consistently building undersized systems since 2018. The county estimates between 1,200 and 1,500 systems were permitted countywide during that period, and it hasn't finished sorting out how many of those actually fall short.

County Attorney Todd Weaver's read on the situation was direct: the prior agency's practice didn't meet the state's minimum standard, and local rules aren't allowed to be looser than that standard. He also noted that liability would likely land on the engineers who cut the corner, not on homeowners who applied for and received what they believed was a proper permit. That's a meaningful distinction if you own one of these systems, but it doesn't change what a buyer needs to verify before writing an offer.

What Changed in 2026

The state moved first. Colorado adopted an updated version of Regulation 43 in March 2025, effective that June. Archuleta County followed with its own regulations aligned to the new standard, approved by the Board of Health at a special meeting on June 15, 2026. The county's Water Quality Department also confirmed it began checking every new design against the tightened standard back in mid-2024, once the gap was discovered.

That closes the door going forward. It doesn't resolve what's already in the ground. As of this writing, the county has discussed several paths for the systems permitted between 2018 and 2023, ranging from doing nothing to requiring inspections tied to any future transfer of title, short-term rental permit, or repair. No single policy has been finalized publicly for how every one of those legacy systems gets checked. That's the open question a buyer or seller should be asking about directly, not assuming has already been settled.

Here's how the eras line up for a property changing hands today:

A system from that middle row could be five years old, exempt from the standard inspection under the four-year rule if it happens to sit right at the edge, and still be one the county would flag if it looked closer. Age protects you from wear. It doesn't protect you from a design decision made before anyone caught the problem.

What Buyers and Sellers Should Actually Ask

The paperwork requirement hasn't changed. What should change is the specificity of the questions behind it.

1. Ask the county for the property's existing OWTS permit history by emailing the Water Quality Department directly, rather than relying only on what the seller has on hand.
2. Find out the exact permit or installation date, not just whether the system is "new" or "old." A system permitted in 2019 and one permitted in 2025 face different levels of scrutiny even if both are technically within a four-year window at different points in time.
3. If the system falls in the 2018 to 2023 range, ask who designed it. The county has already identified specific engineers whose historical designs are more likely to fall short. That information is part of the permit record.
4. Don't treat a four-year exemption waiver as proof of compliance. It waives an inspection requirement based on age. It says nothing about whether the original design met the 90 percent coverage standard.
5. If you're selling a system from that window, consider having it independently reviewed against current Regulation 43 standards even if a waiver would otherwise apply. It's a smaller cost now than a repair demand during someone else's due diligence period later.

None of this changes the legal process. An Acceptance Document is still required for most transfers, and the four-year exemption is still real. It just means the paperwork alone doesn't tell the whole story for one specific slice of the local housing stock, and a good buyer's agent or seller's agent should know which slice that is before the inspection period starts.

FAQ

Does this affect homes on Pagosa Springs' municipal sewer system? No. This issue is specific to individual on-site septic systems regulated by the county's Water Quality Department. Homes connected to the Pagosa Springs Sanitation General Improvement District run through a different piece of infrastructure entirely, one with its own known challenges. The town's collection system has had recurring pump and equipment failures since coming online in 2015, and voters approved a dedicated sales tax in November 2025 to fund repairs over the next several years. It's a separate system with a separate fix underway, and it has nothing to do with the OWTS design issue described here.

What if my system was installed before 2018? Then it predates the flagged design practice. The standard Transfer of Title inspection and Acceptance Document process applies exactly as it always has, with no additional wrinkle from this issue.

What if it was installed after the state's 2025 update or the county's 2026 regulations? These are the systems most likely to have been checked against the current standard, since the county began reviewing new designs for full Regulation 43 compliance starting in mid-2024.

Can I actually find out who engineered a specific septic system? In most cases, yes. Permit records held by the county typically include the designing engineer, and the Water Quality Department can provide that history on request. It's a small step that turns a vague assumption into an actual answer.

If you're buying or selling a septic-served property anywhere in Pagosa Springs or the surrounding parts of Archuleta County, this is exactly the kind of detail that belongs in the conversation before you write or accept an offer, not after an inspector shows up. Eric Roark has spent years coaching clients through the parts of a Southwest Colorado transaction that don't show up on the listing sheet. Let's Coach You Home. Schedule a Relocation Strategy Session and get the questions answered before they become closing-week surprises.