"Watering a flower pot on your front porch technically would not be allowed." That's Sarah Brucker, deputy state engineer at the Colorado Division of Water Resources, describing what a household-use-only well permit actually means in practice. Not the septic tank in the yard. Not the wildfire mitigation everyone in the mountains talks about. The well. The thing most buyers assume comes with unlimited outdoor water simply because there's a pump and a pipe.
If you're touring homes in Evergreen with a five-acre lot and a mental picture of raised garden beds or a couple of chickens, that picture may not be legal on the property you're about to buy. Not because the well is weak. Because of what the permit says it's for.
The Permit Doesn't Care How Much Water The Well Produces
Colorado treats water rights as a separate legal question from land ownership, and nowhere does that show up more than in exempt residential wells. Under state rules that have been in place since a 1972 statute, most private wells drilled on parcels under 35 acres are permitted for household use only. That means water can be used inside the home for drinking, cooking, and sanitation, and nothing beyond the walls. No garden. No windbreak trees. No livestock. Colorado State University Extension's guidance on small acreages spells this out directly, and it's echoed by CSU Extension's Gilpin County office, which notes that many newcomers to the mountains are genuinely shocked to learn they can't water anything outside.
The math behind the rule is almost bureaucratic in its logic: a household-use-only well is assumed to consume roughly 10 percent of the water it draws, with the rest returning to the groundwater cycle through septic and evaporation. Outdoor irrigation breaks that assumption, so the state simply doesn't allow it on the smaller, more common exempt wells, which are capped at 15 gallons per minute regardless of what the aquifer could physically support.
Larger parcels get more room to work with. A well permit on 35 acres or more can typically serve up to three single-family homes, an acre of lawn and garden irrigation, and domestic livestock. That's a meaningfully different set of rights than the household-only permit sitting on the five-acre listing two roads over, and the only way to know which one you're looking at is to read the actual permit, not the well's flow rate.
This is where the low-producing well misconception comes in from the other direction. A well that tests at a modest yield isn't automatically a problem. It may simply need a storage or pressure tank to bank capacity for peak demand, which is a budget line, not a dealbreaker. The real question buyers should be asking isn't "how much water does this well make," it's "what is this well legally allowed to be used for." Those are two different conversations, and only one of them shows up on a flow test.
If you want to expand a household-only permit into outdoor use later, the fix usually runs through an augmentation plan, a court-approved arrangement that replaces the water you pump with water from another source. Colorado water law resources describe these plans as running from a few thousand dollars into the tens of thousands depending on the volume needed, which makes "we'll just get a bigger permit later" a far more expensive Plan B than most buyers expect walking into a showing.
One Evergreen Address, Two Different Sets Of Rules
Here's the part that catches people who've done their homework on Colorado water law and still get surprised locally: Evergreen isn't one jurisdiction. Jefferson County treats the area as a mountain community under its own planning framework, but the Evergreen Fire Protection District reaches into the easternmost edge of Clear Creek County, and plenty of well-and-septic properties sit on that boundary. Two homes that both list "Evergreen, CO" as their mailing address can answer to different county health departments, different septic regulations, and different permit timelines, depending on which side of an invisible line the parcel falls on.
That distinction isn't trivia. It changes how much runway you have during a sale.
The Septic Permit Has To Clear Before Anyone Signs Anything
Separate from the well question entirely, both Jefferson County and Clear Creek County require a septic Use Permit before a property with an on-site wastewater treatment system, commonly called an OWTS, can legally change hands, if any component of the system has been in use for more than five years. The two counties handle the mechanics differently, and the differences matter for timing:
- Jefferson County requires the use permit application at least 10 working days before closing, and once issued, the permit is valid until closing or six months, whichever comes first. Jefferson County's Board of Health adopted the requirement in a July 2003 regulation revision, effective January 1, 2004, specifically because failing or marginal septic systems were being passed to buyers who had no way to know.
- Clear Creek County uses the same five-year trigger, but the permit stays valid for a full 12 months instead of six, and the county's own FAQ lists the most common reasons a permit gets denied: an expired pumping receipt, a bedroom count that doesn't match the system's approved capacity, conflicting inspection records, or a failed transfer-of-title inspection.
A seller working with a Clear Creek County property has roughly twice the breathing room of a seller across the county line in Jefferson County. If you're listing a well-and-septic home near that boundary, that's not a footnote, it's the difference between a permit that comfortably outlasts a slow winter closing and one that expires while you're still negotiating repairs.
Neither county's septic use permit touches the well at all. Jefferson County's own FAQ says so directly: the use permit is limited to the wastewater system, and the department doesn't require inspection of well water quantity or quality as part of that process, even though it recommends buyers check both. That means a fully valid, fully approved septic use permit tells you nothing about whether the well down the driveway can legally water a lawn.
What To Ask For Before You Write An Offer
Local septic servicers who work these transactions daily, including South Platte Services, which handles the county-specific paperwork for wells and septic sales across the Front Range foothills, generally walk sellers through the same document trail buyers should be requesting independently. Before you get attached to a well-and-septic property in Evergreen, ask the listing agent or seller for:
- The well permit number and its allowed-use language, not just a flow test
- Age and depth of the well, plus any pump or storage tank records
- A current or in-process septic Use Permit, and which county issued it
- The septic system's approved bedroom count, matched against the actual bedroom count in the listing
- Recent water quality test results if the well serves drinking water
If any of those documents don't exist yet, that's not automatically a red flag. It just means the timeline needs to start earlier than most buyers assume, particularly if you're on the Jefferson County side of Evergreen with its shorter six-month permit window.
FAQ
Does a septic use permit mean the well has been checked too? No. Both Jefferson County and Clear Creek County limit their use permit inspections to the wastewater system. Well water quantity and quality are handled separately, and buyers who want that information need to request it directly.
If a well permit says household use only, is there any way around it? The permit governs the well, not the property owner's preferences. Changing the allowed use typically requires an augmentation plan through Colorado's water court system, a process that can cost thousands of dollars and take time, so it's worth confirming the permit's language before assuming a garden or livestock setup is possible.
How do I find out which county actually regulates a specific Evergreen parcel? Because Evergreen spans both Jefferson and Clear Creek counties, the safest step is confirming jurisdiction with the parcel's tax schedule number rather than relying on the mailing address, since "Evergreen" alone doesn't tell you which health department issues the permits.
Mountain properties reward buyers who read the permit file as closely as they read the listing photos. If you're comparing well-and-septic homes in Evergreen and want someone who already knows which county is going to ask for what, House2Home Real Estate has spent years walking Front Range and mountain clients through exactly this kind of paperwork. Let's make your house a home, call or email our Arvada team today.
