Larval surveillance is a part of NOMTRCB’s mosquito‑control program and is conducted year‑round throughout the city. This work focuses on identifying and monitoring mosquito larvae in standing water before they become flying, biting adults. By locating larvae early, we can apply targeted treatments that reduce mosquito populations efficiently and prevent the emergence of disease‑carrying adults.
Our field inspectors routinely inspect a wide range of habitats, including storm drains, ditches, containers, abandoned pools, construction sites, waste tires, and natural low‑lying areas. To check for larvae, technicians use two primary tools: a standard mosquito dipper for open water and a turkey baster for small or hard‑to‑reach areas. These tools allow us to sample water accurately and identify the presence of mosquito larvae at various developmental stages. When needed, samples are collected and brought back to the laboratory for identification, either as larvae or reared to adults for more precise species confirmation.
Potential larval habitats are monitored using a software system, allowing our inspectors to periodically re-inspect these locations and treat them until they can be permanently fixed. NOMTRCB shares this information with other city agencies to alert them to water issues that are harboring mosquito larvae.
Our larval surveillance program provides essential information about where mosquitoes are laying their eggs and assists with targeted control efforts to reduce adult populations.
See mosquito larvae or standing water?
If you see mosquito larvae like those shown in the video above, or find standing water that concerns you, please report it to 311. One of our inspectors will come out to inspect the area.