Field data
Two buildings. Five months.
Here's what happened to the rat population.
Track counts from two independent urban sites — monthly comparisons against a Week 1 baseline, August 2025 through January 2026. What went down, by how much, and over what timeframe.
Location A — primary field study
Urban deployment, Aug 2025 to Jan 2026.
Five-month monitored deployment at a dense urban site. Track count plates placed at 12 station locations. Monthly comparisons against Week 1 baseline.
79%
reduction in rodent track presence
Percentage of monitored station locations showing zero track activity by month 5, compared to full activity at baseline
88%
drop in track density
Average tracks per monitoring plate at active stations declined even where some residual activity was still detected
5 months
continuous monitoring period
Uninterrupted deployment from August 2025 through January 2026 with monthly check-in documentation
The 79% and 88% figures measure different things. One counts how many station locations went silent. The other counts how many tracks were left at stations that were still active. Both dropped. That's not one story told two ways. It's two independent signs of the same decline.
Location B
Independent 5-month deployment.
A second independent urban deployment ran concurrently over the same five-month period. Location B showed a 50%+ reduction in rodent track presence — a meaningful decline given a different site profile, food source distribution, and surrounding block pressure than Location A.
Two independent sites producing positive outcomes over the same period gives the data more weight than a single-site result. The mechanism isn't site-specific. The biology is consistent across urban environments.
50%+
reduction in track presence
Station locations showing zero track activity by month 5
71%
drop in track density
Location B — independent 5-month urban deployment, same monitoring period
Fertility reduction
Up to 90% fertility reduction potential.
The maker of Evolve tested how much it reduces rats' ability to reproduce when used alongside active pest control. Their data shows up to 90% fertility reduction. That's the mechanism that prevents the replacement colony from forming after knockdown.
The 79% and 88% results are what a 90% fertility reduction looks like in practice over a monitoring period. The fertility figure tells you what direction the population should go. The track count data shows it actually did.
90%
fertility reduction potential
Documented in active pest control programs that include Evolve fertility management
Hong Kong — June 2025
High-density mixed-use building with persistent rodent activity. Within three months of deployment: sightings fell, bait consumption declined as the population shrank, and no new litters were detected.
Source: SenesTech, Inc. — June 26, 2025
San Francisco — June 2025
Heavily trafficked neighborhood with recurring infestations. Clear reduction in visible rodent activity, reduced poison usage overall, and a measurable drop in new rodent births over the deployment period.
Source: SenesTech, Inc. — June 26, 2025
"These successes prove that fertility control isn't just an idea — it's a practical tool that helps pest professionals get ahead of chronic infestations faster and with less rodenticide."
Joel Fruendt, CEO — SenesTech, Inc.
City-level adoption
The same program running at scale.
Fertility management for urban rodent control has been adopted at the municipal level. These are city-funded programs, not vendor marketing claims.
New York City
2025NYC City Council passed a rat contraceptive pilot bill in October 2024. Deployment of ContraPest — a fertility management product made by SenesTech — began in designated rat mitigation zones in April 2025.
Baltimore
2025Baltimore adopted Evolve for its city-run rodent control program in 2025. The program runs through the city's public health department as part of a broader effort to reduce the rat population citywide.
Chicago
2026The Wicker Park corridor deployment showed positive population results through early 2026, contributing to growing municipal interest in fertility management as a complement to traditional rodent control programs.
Monitoring methodology
How track counts work as a measurement standard.
Track count monitoring uses tracking plates at each bait station. These are cards coated in a medium that shows footprints. Rats moving through the area walk across them. The number of tracks per plate per visit gives you a consistent measure of activity at that location.
Baseline plates are placed in Week 1 before fertility management begins. Monthly visits replace the plates and record the track count. The comparison against baseline shows whether activity at each station is declining, stable, or increasing.
This is the same measurement standard used by city rodent control programs. It produces a documented record you can hand to an inspector or property owner as evidence of active, consistent management.
Week 1 baseline
Tracking plates placed at each station location. Rodent activity recorded across all sites before fertility management begins.
Month 1 check-in
Plates replaced, track counts recorded. Evolve bait stations checked and replenished. Early comparison against baseline.
Month 2 check-in
Second data point against baseline. Population trend becoming measurable. Stations maintained.
90-day summary
Full comparison across all station locations. Track presence percentage, density comparison, documented trend line. Delivered as written record.
Start building your own 90-day record.
The field data above came from properties that started the same program. Tell us about your property and we'll put together the outline for yours.