Why cleanup method comes first in New Mexico
In most of the country, rodent droppings are handled sensibly and that is the end of it. Here the numbers argue for more care. New Mexico Department of Health records show 142 hantavirus pulmonary syndrome cases and 55 deaths in the state between 1975 and 2025, with 7 cases in 2025, 6 in 2024, 7 in 2023 and 3 in 2022, and two confirmed so far in 2026. Nationally the CDC has counted 890 cases since 1993, 94 percent of them west of the Mississippi. The exposure described is specific and ordinary: dried deer mouse droppings in a shed, cabin, garage or barn, stirred into the air by someone cleaning. That is not an exotic scenario in a state where most properties carry outbuildings that sit closed for months. So the sequence is fixed. Open the building and leave it alone for 30 minutes. Mix about 1.5 cups of bleach into a gallon of water. Spray until droppings and nesting material are thoroughly wet, wait a full five minutes, and pick everything up with paper towels that go into a sealed bag. The prohibited part is the part people default to when they are hot and in a hurry: a broom, a leaf blower or a shop vacuum on dry material.
Deer mice, house mice and rats do different jobs
The three species in New Mexico's rodent data occupy different parts of a property, and treating them as one animal leads to bad plans. Deer mice are outdoor and outbuilding animals. They live in woodpiles, brush, sheds and barns rather than kitchens, and they are the species behind hantavirus concern in the West. The controls that matter for them are keeping woodpiles off the ground and away from walls, sealing outbuildings, storing soft material in hard totes, and cleaning by the wet method. House mice are the indoor climbers. They use wall cavities, plumbing chases and gaps around wiring to reach kitchens and attics, they need almost no water, and they leave droppings in a tight line along a runway. Sealing and interior trapping are what work. Norway rats stay at grade and organize around water and food. In an 11-inch rainfall climate that means irrigated landscaping, leaking lines and feed storage. They burrow along foundations and enter at the bottom of the building. Ask any inspector which of the three they think you have, because the answer determines whether the work happens in the attic, along the foundation, or out at the shed.
In dry country, follow the water first
Most rodent guidance assumes food is the limiting resource. With roughly 11 inches of precipitation a year and humidity around 43 percent, moisture usually is. That makes an ordinary property audit worth doing before you spend anything on sealing. Look at hose bibs that drip, irrigation lines and emitters, valve boxes that seep, evaporative cooler overflow, condensate lines, stock and pet water left out overnight, and damp mulch under dense ground cover. Rats in particular need regular water and will arrange their entire range around a dependable source. There is a loop in it as well. rodents chew irrigation tubing to reach water, the chew creates a leak, and the leak becomes a better source than what they started with. People often find the infestation by noticing a wet patch in gravel that should be dry. So the order of operations is water, then food, then sealing. Repair the leaks, take the bowls in at night, move feed into metal, thin the cover that keeps ground damp. Exclusion done after that carries much more weight, because the property is no longer worth the effort of getting into.
Sealing stucco, block and adobe walls
The construction in Albuquerque, Rio Rancho, Las Cruces, Santa Fe and Roswell creates a predictable set of openings, and they are not the ones a guide written for wood-frame housing describes. Weep holes come first. They exist for drainage, they are exactly the size that matters, and the correct treatment is quarter-inch mesh rather than plugging them shut. Second, penetrations: every place conduit, plumbing, a cooler line or a low-voltage cable passes through a wall was sealed once with something that has since cracked under strong sun and a wide daily temperature swing. Third, the roofline. Parapets, canales, vent screening and the junction where roofing meets a wall all offer gaps that lead into an attic or a ceiling cavity. Fourth, doors: garage and service door sweeps sit at ground level and fail at the corners. Adobe and older masonry add their own issue, since patching has to be compatible with the wall rather than simply hard. Ask a contractor what material they intend to use, because metal mesh and appropriate mortar hold up where a bead of foam in a sun-exposed wall does not last a season.
One property, several buildings, one plan
a rodent job in this state is rarely just a house. Most properties carry a garage, a shop, a shed, sometimes a casita or a barn, and each of those is a separate structure with its own weak points and its own population. Outbuildings are usually worse than the house, for practical reasons. They are framed lighter and settle unevenly, they have large doors with worn seals, they store feed, cardboard, cushions and fabric, and nobody walks through them for weeks. A shop with a cracked door seal and a bag of dog food is better habitat than the residence beside it. That matters because animals move between structures as conditions change. Sealing the house alone does not reduce the population on the property, it redirects it, and when the shed gets cold or the feed runs out the pressure comes back. When you get a quote, ask whether it covers every structure or only the residence, and ask which building the company thinks is the reservoir. Starting with the feed building and the outbuilding that holds droppings is often more effective, and safer, than starting at the front door of the house.
What drives the price, and the questions that settle it
Nobody can price this from a phone call, especially on a property with several buildings. Spread comes first, both inside the house and across the outbuildings, since each area needs its own traps and its own hours. Second is the number of openings and how reachable they are. Screening weep holes and vents at ground level goes quickly; sealing at a roofline or parapet takes access equipment and time. Third is distance, because a property well outside town adds travel to every follow-up visit, and that shows up in the total. Fourth is cleanup, which is frequently the largest line. Removing contaminated insulation, disinfecting and re-installing on a home near the state median value of $215,000 deserves its own number rather than a footnote, so ask directly whether it is included. Fifth is what happens after: how many visits come with the job, and what the exclusion warranty covers, for how long, and what voids it. Ask both companies the same closing question, which is what happens if activity returns two months after the work, then compare those answers before the totals.