6 Acequia Rules That Decide Who Gets Water in New Mexico
New Mexico’s Interstate Stream Commission measured 112.4 miles of the Rio Grande sitting dry between the Cochiti and Elephant Butte reservoirs this summer.
It was the driest stretch the agency has recorded since at least 2007.
New Mexico’s acequias felt it first.
When there isn’t enough water to go around, state law and centuries of local custom both step in to decide whose turn is next.
These are the acequia rules that decide who gets water in New Mexico.
Note: This is general information, not legal advice. Acequia governance and water-rights rules vary by ditch and can change, so confirm the specifics with your local acequia commission or the New Mexico Office of the State Engineer.
1. Prior and Paramount Rights
A priority list that starts above every ditch on the Middle Rio Grande anchors the acequia system.
Congress gave certain Pueblo lands along that stretch of river what federal law calls Prior and Paramount water rights, under acts passed in 1927, 1928, and 1935.
The Middle Rio Grande Conservancy District (MRGCD) spells out exactly what that means in a shortage: The district serves those lands ahead of every other acre it irrigates.
Everyone else waits.
Six Pueblos share that valley with the acequias: Cochiti, Santo Domingo, San Felipe, Santa Ana, Sandia, and Isleta.
The U.S. Bureau of Indian Affairs coordinates their deliveries straight with the district.
No acequia’s priority date, however old, outranks it.
2. First in Time, First in Right
One short sentence built the state’s entire water code.
Under New Mexico’s water code, Section 72-1-2, priority in time gives the better right.
Beneficial use, putting the water to work, sets the basis, measure, and limit of that right.
Two parciantes on the same acequia can farm side by side and still stand on opposite ends of a shortage.
The parciante whose family recorded a claim decades earlier draws water first.
The newer claim waits its turn, even on land right next door.
No exceptions.
Acequia commissioners don’t get to override that order by a vote.
3. Mayordomo’s Authority
Every acequia answers to one elected officer with the power to decide who waters on a given day.
State law gives the mayordomo “the superintendence of all work thereon, the distribution of the waters thereof and the collection of fines.”
That’s the repartimiento, the rotation that sets whose headgate opens and for how long.
Not a judge.
Not a legal authority, either.
The mayordomo also assesses the ditch-cleaning labor every parciante owes each spring.
Commissioners write bylaws to spell out the rest, so the exact schedule can look different from one ditch to the next.
Psst! Think you know your acequia facts from acequia myths? Flip these cards and find out.
4. Ditch-Duty Cutoff
Skipping ditch duty can shut off a parciante’s water, no matter how senior their priority date is.
Every owner on the ditch owes labor each year clearing it out, the annual limpia, or a cash assessment in its place.
Skip both after notice.
State law then bars that person from taking water off the ditch at all while the default continues.
Keep taking it anyway, and the penalty runs $100 to $200 for the ditch.
Seniority doesn’t cover it.
A senior priority date means nothing to a mayordomo watching an unpaid assessment.
5. Water Banking
An acequia can move water between neighbors without anyone losing their claim to it.
A ditch can set up a water bank that temporarily reallocates a parciante’s unused water to another parcel the ditch already serves.
No trip to the state engineer.
The point of diversion and purpose of use both stay put.
Nothing else changes.
A fallow field’s share can cover a neighbor’s short crop for a season.
That reroute decides who receives the water that season, not just who holds the underlying right to it.
6. Four-Year Forfeiture Clock
The state can take a water right away from a parciante who simply stops using it.
Go four straight years without putting the water to beneficial use, and state law lets the right lapse back to the public.
That threat applies to the underlying water right, acequia-served land included, not just the big irrigation districts downstream.
Gone.
A parciante who leases out their land, sells it, or just lets a field sit needs someone keeping that water moving.
Otherwise, the priority date that’s been in the family for generations can disappear for good.
New Mexico’s Forfeiture Timeline
New Mexico’s forfeiture clock on a water right doesn’t stop the moment four years of non-use passes.
The State Engineer first has to send a formal declaration of nonuser.
The water right holder then gets one more full year to fix it before the right is gone.
The State Engineer can also grant an extension of up to three years at a time for reasonable cause.
One dry season on its own rarely costs a parciante their water right.
This Year’s Delivery Cutoffs
This year put New Mexico’s Prior and Paramount rule to the test on the Middle Rio Grande.
The conservancy district expected those Prior and Paramount-only operations to begin as early as May 18, weeks ahead of 2025, when that threshold wasn’t reached until July.
Those conditions were already in force by the first week of June, cutting off every non-Pueblo delivery upstream of Isleta Pueblo.
By late August, the Interstate Stream Commission had measured 112.4 miles of the Rio Grande sitting dry between the Cochiti and Elephant Butte reservoirs.
That’s the most dry mileage the agency has recorded since at least 2007.
The cutoff didn’t stay put.
Rain brought brief resumptions in mid-June, late August, and early September.
Each time, the district pulled non-Pueblo deliveries again within days as the river dropped back.
The most recent suspension hit non-Pueblo acequias upstream of Isleta on September 4, just two days after the latest resumption.
The district asked farmers to weigh where that limited water would do the most good, rather than take it simply because their turn had come up.
Non-Pueblo irrigators from Peña Blanca down through Sile, Algodones, Bernalillo, and Albuquerque’s South Valley spent the second half of summer checking those upstream suspension notices more closely than any calendar.
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