Rats in the District are about to find their favorite trash alleys a lot less friendly. D.C. Health is launching a pilot program that will feed the city’s rodents non-lethal fertility-control bait, part of a rotating strategy meant to shrink the exploding rat population without relying only on poison. Inspectors will cycle through different tactics in three-week rounds, then stick with whatever appears to work best. Officials are stressing this is a controlled experiment folded into the city’s broader integrated pest management plan, not a sudden abandonment of traditional methods.
How the pilot will work
According to WUSA9, D.C. Health inspectors will rotate three approaches in three-week cycles: a non-lethal fertility-control bait, a first-generation anticoagulant tracking powder that rats ingest while grooming, and a second-generation anticoagulant bait placed directly in active burrows. The department told the station that after the first week, it will “continue to use the method that works” in weeks two and three, based on what inspectors see on the ground and how the rats respond. Officials reiterated that the birth control bait is being tested as one tool in the kit, not as an instant substitute for more familiar rodent-control tactics.
Past tests and evidence
Fertility baits are not entirely new to the District. SenesTech, the company that makes products such as ContraPest, reported in a 2020 press release that a multi-month pilot with D.C. Health produced camera-counted drops of roughly 51 percent to 88 percent at treated locations. An Advisory Neighborhood Commission resolution later cited camera monitoring that showed rat sightings falling by as much as 90 percent during that earlier trial. City officials, however, have not released a comprehensive, peer-reviewed dataset that tracks long-term results from those tests.
Why the city is mixing methods
Behind the scenes, the city is trying to solve a two-part problem: bring rat numbers down quickly while also avoiding unnecessary harm to other animals. A 2025 Washington Post analysis of samples from a local wildlife rescue found widespread anticoagulant exposure in dead and sick birds and mammals. That finding has turned up the pressure on cities to lean more on long-term, less toxic tools. D.C. Health officials say fertility control could help reduce the city’s dependence on lethal poisons while still keeping steady pressure on rat populations over time.
How residents can help
Residents are being urged to keep submitting rodent complaints through 311 so inspectors can pinpoint hot spots and measure how well the pilot is working. The department says it is coordinating with the Department of Public Works, the Department of Buildings, business improvement districts and neighborhood commissions to time and target treatments. As WUSA9 reported, the treatments will be focused on alleys and active burrows, and inspectors will keep using whichever approach proves most effective in the later weeks of each rotation. Officials say the pilot will be data-driven and will only be expanded if results hold up over time and unintended impacts on other animals stay low.
For more on how D.C. handles rodent complaints and what local rules require for abatement, D.C. Health posts guidance and regulations on its rodent control pages.
