Understanding Water Rights: What Are They and Do You Need Them?

Here is the question you're really asking. You found a parcel. Can you drill a well on it and use the water, or can't you?

Almost every article on this subject answers a different question. They explain riparian rights and prior appropriation, tell you the West is first in time first in right, and leave you exactly where you started. That history matters, and I'll cover it, but it is not your answer.

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Buying Raw LandBuying Land to Build a Retirement Home: What to Check FirstThe parcel price is the part everybody checks and the part that almost never decides anything. What decides it is the soil, the water, how far you are from a hospital that admits patients, and when the title actually lands in your name. Three of those four you can answer before you spend a dollar.

Your answer is a number in your state's exempt well rule, and whether your particular parcel qualifies for it. That number ranges from two acre-feet a year in Nevada to fifteen thousand gallons a day in Oregon to, in some Colorado situations, indoor use only with no outside water at all. And in Texas, whether you get the exemption at all depends on whether your parcel is bigger than ten acres.

This article is about getting you to that number.

The three questions everybody smashes into one

This is the frame that makes the rest of it make sense.

One. Do you need a water right to use the water? That's the doctrine question, and for household use the answer is usually no. Most states carve out an exemption for a single family's domestic use.

Two. Do you need a permit to drill the hole? Almost always yes, and this one catches people. Exempt from the water right does not mean exempt from paperwork. Florida wants a well construction permit. Arizona wants a notice of intention to drill. Minnesota wants a notification and $325. North Carolina makes the county health department issue a construction permit with a site evaluation. Texas districts require you to register the well even when the permit is waived.

Three. Will the state actually issue one for your parcel? This is the question that kills deals, and it is the one nobody writes about. You can be fully exempt from the water right and still be told no, or told yes with conditions that change what the land is good for. Colorado is the extreme case. Nevada and Arizona have narrower versions of the same trap.

Keep those three separate in your head and the state rules stop looking like chaos.

The doctrine, briefly, and why it isn't your answer

Two systems, split roughly at the hundredth meridian.

Riparian is the older eastern system: the right to use water comes from owning land that touches it. It isn't quantified, it has no priority date, it isn't lost by not using it, and in a shortage everybody shares the shortage. In its pure form it says almost nothing about groundwater.

Here's where our ten states actually sit, and notice it is not a clean binary.

Four of those ten, Florida, Minnesota, North Carolina and functionally Arkansas, are regulated-riparian permit systems that behave more like each other than like textbook riparian. Which is the point: the doctrine label tells you less than the exemption number does.

Texas deserves its own paragraph, because it runs two systems at once. Surface water is state property, appropriated by permit through TCEQ. Groundwater is the opposite: the legislature says a landowner owns the groundwater under their land as real property, and the statute names the doctrine directly as the rule of capture. In plain terms, in Texas the water under your dirt is yours the way the dirt is, and your neighbor can legally pump your well dry so long as they aren't wasting it or being malicious. The only check is a local groundwater conservation district, and roughly a third of the state doesn't have one. One practical exception worth knowing: you can build a stock tank holding up to 200 acre-feet for domestic and livestock use without any permit at all.

The question that matters: can you drill a well

Here is the table this article exists for. Every figure comes from the state's own statute, rule or water agency.

Three things jump out of that table.

Exempt almost never means unregulated. Eight of the ten still want a permit, a notice, a registration or a construction permit before anyone drills. The two closest to genuinely paperwork-free on the water right itself are Nevada, outside a designated basin, and Oregon, and both still require a licensed driller and a filed log.

Oregon is quietly the best of the ten for a buyer. Its exempt use isn't a tolerated exception, it's a real water right: the statute says an exempt use constitutes a right to appropriate groundwater equal to a certificated right, and your priority date is the date on the well log. Fifteen thousand gallons a day for domestic use is also, by a distance, the most generous number in the table.

Colorado is the hardest, and it isn't close. It's the only state where the answer can be a permit that allows no outside water use at all. That gets its own section below, because we sell a lot of Colorado.

Two acreage thresholds that decide everything

If you take one practical thing from this article, take this.

Colorado's line is 35 acres. Texas's is 10. In Colorado, a parcel of 35 acres or more can generally get a Domestic permit, with three dwellings, an acre of lawn and garden, and livestock watering. Under 35 acres in an over-appropriated drainage, which Colorado's own water agency says is most of the state, you're generally looking at Household Use Only: inside one house, no outside use, no livestock. In Texas, the statutory exemption from a groundwater district permit requires a tract larger than 10 acres. A 5-acre Texas parcel inside a district gets no exemption at all and has to apply under district rules.

So a 20-acre parcel is small in Colorado and large in Texas. Same twenty acres. That is the kind of thing that never shows up in a listing and changes what the land is worth to you.

Texas has a second trap in the same statute: the exemption does not apply if the groundwater will supply a subdivision that requires plat approval. And the districts can still apply their spacing rules.

Colorado, because it is the hardest and we sell there

Colorado's Division of Water Resources issues two kinds of exempt well permit and the difference between them is the whole ballgame.

Household Use Only is what it sounds like: ordinary household use inside one single-family dwelling, and, in DWR's own words, no outside water use or livestock watering. No garden. No hose. No stock tank.

Domestic allows up to three single-family dwellings, irrigation of one acre or less of lawn and garden, and watering domestic animals and livestock. That's the one you want.

Which one you get comes down to four things: how big the parcel is, when and how it was created, whether it sits in an augmentation plan, and whether there's already an exempt well on it. Thirty-five acres is the hinge. DWR's own parenthetical on over-appropriation is worth quoting: most stream systems in Colorado are over-appropriated, and only a few limited areas on the western slope are not.

So what does that mean for a real parcel? Take Costilla County, where a lot of our Colorado inventory sits. It's in the Rio Grande division, it's not a Designated Basin, and the Rio Grande is over-appropriated. A five-acre parcel there fails the 35-acre test.

Rather than guess at what that means in practice, I pulled Colorado's own permit records. Since January 2021, Costilla County has issued 516 residential well permits. Four applications were denied countywide in that period. Of the 516, 229 are Household Use Only, 169 are Domestic, and 102 are Domestic with stock.

So the honest answer for a five-acre Costilla buyer is: you will almost certainly get a well permit, and it will almost certainly be indoor use only. The Domestic permits in that data are going to the county's 35-acre-and-up tracts. If your plan involves a garden, a few chickens and a hose bib outside, that plan needs a bigger parcel or a different county.

Two more Colorado things worth carrying. A permitted well is not necessarily a producing well: DWR sizes household demand at 75 gallons per person per day, so a family of four needs about 300 a day, and a low-yield well can still work with storage and controlled pumping. And since 2009, if you buy a property with an existing unregistered well, registering it is on you.

The part DWR will not do for you, in their words: the division cannot confirm that a particular well permit will be issued without completing an evaluation, and cannot guarantee issuance of any permit before that review is done. They say it in writing, in two separate publications. Which means nobody, including a seller, can promise you a permit.

What you can do is better than a promise. Colorado publishes a searchable well permit database. Look up the neighboring lots in the same subdivision and read the allowed uses printed on their permits. That is the single most useful pre-purchase move on a Colorado parcel and almost nobody makes it. If you want certainty, file the application. It's $100, and the state has 49 days to answer.

Does the deed convey the water rights?

It depends on which system you're in, and this is where buyers get hurt.

In riparian and regulated-riparian states, Arkansas, Florida, Minnesota and North Carolina, the right to use water comes with owning the land and was never separable. There's usually no separate instrument to hunt for. What can exist separately is a permit, which is issued to a person for a use and has to be transferred administratively.

In prior appropriation states, Arizona, Colorado, Nevada, New Mexico, Oregon and Texas for surface water, a water right is separate property with its own chain of title, and it does not automatically ride along on a deed of the dirt. Colorado's DWR puts it plainly in its home-buyer fact sheet: water rights are conveyed through deed, stock certificate or other legal documents, and a property owner is not entitled to use the ditch or stream on their property without a water right. Other people may have a right to use water flowing through your land, and a right to come onto it to maintain the infrastructure.

Several states have an active market in severed water rights. In Colorado, ditch and reservoir company shares are bought and sold apart from land as a matter of course. In Nevada and New Mexico, permitted rights transfer with State Engineer approval and sellers commonly keep them. And in Texas, because groundwater is real property, the groundwater estate can be severed and conveyed separately from the surface exactly like minerals. Most land buyers have never heard of that and it is worth asking about on any Texas purchase.

Oregon runs the other direction, usefully. State law says water used in Oregon stays appurtenant to the premises where it's used, so the right travels with those specific acres. But OWRD is blunt that it isn't automatic: water rights are not automatically conveyed to new owners when property ownership changes, and somebody has to file an ownership update. Oregon also requires a seller, on accepting an offer, to tell the buyer in writing whether the documents evidencing a water right are available and to hand them over at closing.

What actually goes wrong

Three failure modes, and all three are documented by the agencies themselves rather than by me.

The permit comes back narrower than you planned for. Colorado's home-buyer FAQ says it outright: certain properties may not qualify for a well permit, and those that do may be limited to in-house use only. Not all wells labeled domestic allow the same uses. Read the permit, not the word.

The well goes dry because the basin was over-allocated. Oregon has a statute creating a state program to replace, repair or deepen domestic wells affected by declining groundwater in the Greater Harney Valley. Legislatures do not fund well replacement grant programs unless a lot of households' wells failed.

The state restricts you later. Nevada requires the State Engineer, where water levels have declined over ten consecutive years, to order withdrawals restricted to conform to priority rights, and the statute says expressly that this includes domestic wells. Domestic wells get a floor of half an acre-foot a year, metered. In revocable-permit areas a buyer can later be barred from repairing the well and required to connect to a public system at their own expense, and Nevada records a notice at the county recorder saying so. Pull it.

The pre-purchase checklist

Every item here traces to a state agency's own guidance.

• Pull the well permit or well log for the parcel and its neighbors, and read the allowed uses. Not whether a permit exists. What it allows.
• Confirm how and when the parcel was created. Subdivision plat, pre-1972 deed, county exemption resolution. In Colorado this determines eligibility outright.
• Check the acreage against your state's threshold. Thirty-five acres in Colorado. Ten in Texas.
• Check the parcel against the state's restricted-area map. Colorado Designated Basins and the Denver Basin, Arizona's Active Management Areas, Oregon's 22 groundwater administrative areas, New Mexico domestic well management areas, Nevada designated basins, North Carolina capacity use areas.
• Ask whether an exempt well already exists on the parcel. Most states allow only one.
• If there's a well, get a pump test and a water quality test before closing. A permit is not a promise of yield.
• Ask for the water right documents themselves, not the seller's description of them. Decree, certificate, permit, stock certificate, report of conveyance.
• In Arizona, demand the affidavit of disclosure. State law requires a seller of five or fewer unsubdivided parcels in an unincorporated county area to give the buyer a written affidavit at least seven days before transfer, and you get five days to rescind after you receive it. It asks whether the property is served by a well, a shared well, a water hauler or nothing. A waiver of the seller's liability for what's left out is not binding.
• In Colorado, when it matters, just file the application. A hundred dollars and 49 days beats a guess.

Having water rights and having safe water are different subjects

Worth saying because people conflate them. Colorado's water agency says flatly that it does no water quality testing. Different agency, different law.

And here's the one most private well owners don't know: EPA states that drinking water from private wells is not regulated under the Safe Drinking Water Act, nor by most state governments. About 43 million Americans, roughly fifteen percent, are on private wells, and EPA's position is that the owner is responsible for delivering safe water to the household. Nobody is testing it for you.

EPA's recommendation is to test annually for total coliform bacteria, nitrates, total dissolved solids and pH, more often if there are small children or someone pregnant in the house, and immediately after flooding or any other event that could have changed things. Use a certified drinking water lab. Two of our states build it in: Minnesota requires the contractor to have a sample tested for bacteria, nitrate and arsenic at construction, and North Carolina's county permitting program includes testing.

So do you need water rights?

For a house and a garden on a rural parcel, in nine of the ten states we sell in, no. You need to fit inside an exemption, and you need a permit to drill. That's a different and much smaller problem than the phrase “water rights” makes it sound.

Where it gets serious is when the parcel doesn't qualify for the exemption, or qualifies only for the narrow version. That's a fact about the specific dirt, not about the state, and it is knowable before you buy. The state publishes the database. The neighbors' permits are public. The acreage threshold is written in statute.

Go look. It takes an afternoon and it is the difference between land you can use and land you can only visit.