Owning a Mountain Rental — Water, Septic, Snow, and Other Realities

We get a call about once a month from someone who just bought a mountain cabin as a long-term rental investment. They're excited. They've underwritten the deal. The numbers look good. And then we walk through the questions they hadn't thought to ask.

The well

Most mountain properties above 7,500 ft are on a private well, not municipal water. That means:

• Annual water testing. Boulder County recommends annual coliform and nitrate tests. We schedule and pay for these on managed properties; if you self-manage, the responsibility is yours.
• Pump replacement. Well pumps last 8-15 years. Replacement is $2,000-$5,000 depending on well depth.
• Drought sensitivity. Some shallower mountain wells go dry in late summer of a low-snow year. We disclose well-depth and historical-low-water info on every listing.

The septic

Not city sewer. That means:

• Pumping every 3 years per Boulder County code, $400-$700 each time.
• Inspection at sale is required by Colorado law as of 2017. Plan on $400 inspection and any required repairs at closing.
• Tenant-education matters. No flushing wipes, no grease down the drain, no garbage-disposal use beyond minimal. We add a septic-care addendum to every mountain-property lease.

Propane

Most mountain homes heat with propane, not natural gas. That means:

• A 500- or 1000-gallon tank in the yard, owned by the homeowner (not the propane company, in most cases — verify at closing).
• Tenant pays for propane usage, typically by setting up an account with Suburban Propane or AmeriGas. We coordinate the account setup at lease signing.
• Tank refills require winter access. We ensure the driveway is plowed for the propane truck.

Snow removal

CDOT plows the highways but not your driveway. Most mountain leases need to address:

• Who plows. Most Pinecrest mountain leases include owner-paid plowing November–April for the driveway and walkway. The cost runs $80-$150 per visit, $400-$1,200 per season depending on property and snow year.
• What triggers a plow. We use a 4-inch trigger for the driveway, morning-after for the walkway.
• Tire chain requirement. Colorado statute requires chains or dedicated snow tires on Magnolia Road, Sunshine Canyon, and most upper-canyon roads November 1 to April 30. We add a tire-chain addendum to mountain leases.

Wildfire mitigation

This one's gotten serious post-2020 fire seasons. Boulder County requires defensible-space mitigation on most properties in the WUI (wildland-urban interface). That means:

• Zone 1 (0-5 ft from house): non-flammable materials only. No mulch, no woodpile.
• Zone 2 (5-30 ft): thinned vegetation, removed dead and down material.
• Zone 3 (30-100 ft): spaced trees, removed ladder fuels.

We coordinate with vendors on initial mitigation work and with the county on annual re-inspection.

What this means for the underwriting

A mountain rental's expense ratio runs 25-30% of gross rent. A comparable Boulder townhouse runs 15-20%. Don't underwrite a mountain property at townhouse expenses.

More questions? Talk to an owner advisor — Hana handles our owner accounts and has walked through this conversation with about a hundred owners over the years.