Pest Control in St. Paul, Minnesota

A pre-war city, by the numbers

St. Paul counted 311,527 residents in the 2020 Census, according to a City of Saint Paul planning document that also divides the city into 17 neighborhood districts. What sets it apart for pest work is not its size but its age. In the Census Bureau’s 2024 American Community Survey one-year estimates, 57,082 of the city’s 135,910 housing units were built in 1939 or earlier — about 42 percent. A Minnesota Compass profile posted by the City, based on 2013–2017 survey data, put that share at 43.5 percent, so the pattern has held steady for years. Another large block of homes went up between 1940 and 1969.

A house that has stood for 85 or more years has been through a lot of change: coal chutes filled in, knob-and-tube wiring swapped out, radiators replaced, porches enclosed, and new plumbing and cable lines drilled through old stone or block foundations. Each of those projects can leave a gap. University of Minnesota Extension notes that mice look for warm shelter as fall approaches, that they fit through the tiniest spaces, and that barriers against them need to be airtight. In an older St. Paul foundation, the places to check are where utilities enter, around old window wells, and along the sill where wood meets masonry.

The same survey shows how the city lives. Of 128,572 occupied units in the 2024 estimates, 64,586 were renter-occupied and 63,986 owner-occupied — almost exactly half and half. That split is why the next two sections matter so much here.

The Fire Certificate of Occupancy program and what it means for renters

The Department of Safety and Inspections (DSI) requires every building except owner-occupied single-family homes and duplexes to have and maintain a Fire Certificate of Occupancy issued by its Fire Safety Inspection Division. Non-owner-occupied one- and two-unit rentals are covered too, and owners who register those properties receive a provisional certificate pending inspection. Tenants can look up a building and the most recent inspection grade it received on DSI’s public Certificate of Occupancy map, and prospective renters can review inspection records through the City’s property search portal.

DSI also tells renters that if a landlord is not making needed repairs, they can call 651-266-8989 and ask for an inspection, and it notes that state law prohibits a landlord from evicting a tenant or raising the rent because the tenant made a report. For a household dealing with cockroaches or bed bugs in an apartment, that is useful context: the city process and a private pest control visit are two separate tracks, and they can run at the same time.

Who is responsible for an infestation under city guidance

DSI’s page on rats, cockroaches and other vermin spells out a general rule that St. Paul landlords and tenants should both know. The City can require either the owner or the tenant to exterminate pests found inside a building. The owner is generally responsible when:

• two or more dwelling units are infested;
• common areas of the building are infested; or
• the infestation happened because the owner did not keep the building in a proper sanitary condition.

The occupant is generally responsible when only that one unit is infested. DSI adds that Code Enforcement can issue orders related to cockroaches, and that when an infestation is severe the City can condemn a building or unit as unfit for human habitation; it must then be vacated and cannot be re-occupied until the infestation is gone.

That rule lines up with what University of Minnesota Extension says about cockroaches. Extension identifies the German cockroach as the most common indoor cockroach in Minnesota, found near kitchen and bathroom plumbing and in cracks in cupboards, and it says control in multi-unit buildings means treating the infested unit and all adjacent units with a pest management service. It also advises against aerosol foggers, which do not reach the cracks where cockroaches hide. In a St. Paul fourplex or walk-up, one tenant spraying one kitchen rarely settles the problem, which is one reason the city guidance shifts responsibility to the owner once more than one unit is involved.

Bed bugs in a city of apartments and older duplexes

Saint Paul – Ramsey County Public Health describes bed bugs as parasites that feed on people and animals, notes that people can be bitten without realizing it, and says they are very difficult to eliminate on your own, recommending a pest control service instead. University of Minnesota Extension adds that bed bugs are skilled hitchhikers carried by travelers, and that research at the University found 76 percent of samples submitted for identification were not bed bugs at all. That last point is worth remembering before anyone throws out a mattress: confirm the insect first.

For items you can handle yourself, Extension gives specific targets: a two-hour core exposure at 120°F is considered the minimum for heat treatment, and freezing requires holding items at 23°F or colder for at least five days. Whole-unit work in a St. Paul apartment or duplex is a job for a licensed company, and under the city’s guidance above, whether the landlord or the tenant arranges it can depend on how many units are affected. Ramsey County also runs a program called HouseCalls, a collaboration between Saint Paul – Ramsey County Public Health and Minnesota Community Care, that offers financial assistance and support to keep families from becoming homeless because of safety and sanitation concerns. Ramsey County Public Health can be reached at 651-266-2400.

Rats, alleys and the City’s own response

In St. Paul, outdoor rat complaints are handled differently from indoor ones. DSI’s prevention advice is plain: use proper garbage cans, keep trash picked up, cut weeds and tall grass, and stack firewood one foot off the ground. If you see evidence of rats or other vermin, the City asks residents to call its Information and Complaint line at 651-266-8989, and DSI says Animal Control can come out, test rat holes and bait sewer lines in the area.

What the City does not do is exclusion and trapping inside your house or business. Once rodents are in a basement, wall cavity or restaurant storeroom, that is private work. A licensed company will usually combine trapping with sealing entry points, and Extension cautions that cats, birds and other animals can eat mice that have taken poison — a real consideration in neighborhoods where pets and wildlife share the same yards.

The Mississippi River, the bluffs and mosquito season

The Mississippi runs through the middle of St. Paul, and the City’s Great River Passage initiative describes 26 miles of riverfront in Saint Paul. The whole urban stretch is part of the Mississippi National River and Recreation Area, which Congress established in 1988 to cover a 72-mile reach of river through the Minneapolis–Saint Paul area. The National Park Service says it owns only 67 of the roughly 54,000 acres inside the park’s boundaries; the rest is city and regional parkland, a state park, a national wildlife refuge, and private businesses and homes. For the houses along the bluffs, the flats and the river valley neighborhoods, that means wooded slopes, backwaters and low ground close by.

Mosquito control in St. Paul starts with a public agency. The Metropolitan Mosquito Control District was created by the Minnesota Legislature in 1958, now serves Hennepin, Ramsey, Anoka, Washington, Dakota, Scott and Carver counties, and lists its main office at 2099 University Avenue West in Saint Paul, phone (651) 645-9149. Its field work relies on the larvicides Bti and methoprene. What it does not do is routine yard spraying: MMCD states that it does not spray private property unless there is a threat of mosquito-borne disease in the area, although it may treat a property if mosquito numbers are extremely high and the treatment would benefit more than one household. Barrier treatments around a single St. Paul backyard are handled by private applicators with the appropriate Minnesota license.

The fall invasion, and why termites are rarely the answer

The National Weather Service office for the Twin Cities puts the normal date of the first fall freeze between October 1 and October 10. The weeks before that are when St. Paul homeowners start noticing insects on sunny siding. University of Minnesota Extension says boxelder bugs are drawn to buildings with a lot of southern or western exposure, that fall is the time to control them by sealing openings, and that once they are indoors the only practical control is physical removal. Tall old houses with wide south-facing walls can collect them in large numbers.

Wood damage in an older home is a common worry, but Extension describes termites as uncommon to rare in Minnesota and generally seen only in the southern third of the state. Carpenter ants, which it calls very common here, are the more likely culprit in damp porch framing, window sills or roof edges. Getting the identification right changes the whole plan, so it is worth describing where the insects appear and whether there is sawdust-like debris when you call.

ZIP codes served

Exterminator Dispatch routes requests across St. Paul ZIP codes, including:

Postal ZIP boundaries do not follow city limits exactly, and some of these codes also include parts of neighboring suburbs. Give your ZIP when you call and the request will be routed to a licensed company that covers that address.

Verifying that a St. Paul exterminator is actually licensed

St. Paul adds a city-level layer on top of the state license. The City issues its own Pest Control License under Chapter 334 of the Saint Paul Legislative Code, for controlling insects, vermin, rodents and pest birds inside or outside any structure. According to DSI, the application requires a Minnesota Department of Agriculture Structural Pest Control Master license, a list of employees with their state license numbers, and proof of insurance, and the city license is renewed annually.

At the state level, the MDA licenses structural applicators who apply pesticides in, on, under or around structures. An applicator must be employed by a licensed structural pest control company with a Master applicator, and becoming a Master requires at least two years as a licensed Journeyman. To check a company, get its full business name and the name of the technician, look both up in the MDA’s online license lookup, and ask whether the company holds a current City of Saint Paul Pest Control License. Exterminator Dispatch routes St. Paul requests only to companies expected to hold the appropriate licenses, and callers are always free to confirm them before any work begins.