City of College Park, Maryland

Public Works

Click here for information from Maryland Department of Agriculture on Mosquito Control

Mosquito Workshop Slide Show


MDA spraying starts the last week in May (weather permitting)

From late spring through early autumn, the City of College Park cooperates with the Maryland Department of Agriculture (MDA) to identify and control mosquito populations. Larviciding treatments are made by MDA personnel. Requests for local spraying should be made to Public Works, which will be forwarded to MDA. MDA will survey the area of concern prior to spraying, using traps and landing rate counts, and MDA may request access to your property to place a trap. If count thresholds are met, MDA may make a control spray application. Wednesday night is the designated day when spraying for adult mosquitoes will occur in College Park.

To make a spray request, contact Public Works at 240-487-3590 or We will need the following information, name, address, phone, email, problem area, time of day when mosquitoes are the worst, and any area of stagnant water in the vicinity. Also need to know if we can have access to your property to set a trap.

Residents can request exclusion from the adult spray program by completing this exemption form and returning it to:
     Program Supervisor
     Mosquito Control Section
     50 Harry S. Truman Parkway
     Annapolis, MD 21401

The Asian tiger mosquito is active during the day and only breeds in containers of standing water (i.e. around humans). Residents are encouraged to eliminate the sources! Look for unused containers, buckets, toys, bird baths, flower pots and saucers, tarps, corrugated drainpipes, free-standing basketball hoops and store them so they don't hold water. Make sure gutters are clean and work with your neighbors to identify potential mosquito breeding areas.

For permanent areas of standing water (ponds, rain barrels, etc.), mosquito "torpedos" can be used to target and kill mosquito larvae. You can stop by Public Works to obtain a mosquito torpedo Monday through Friday, 7:30 a.m. - 4:00 p.m. Please click here for a list of FAQs from the manufacturer.

Safety Concerns

People and pets may be exposed to pesticides used in a residential misting system through direct contact with sprays, by touching plants or other objects in the treated area, or by inhaling small amounts of pesticide remaining in the air. EPA has assessed the human health and environmental risks of the pesticides most commonly used in misting systems. Most of these pesticides last only short periods in the environment, so long-term exposure to humans is not expected. Based on its assessment, using toxicity data and exposure estimates, EPA does not expect risks of concern to humans when these chemicals are used in outdoor residential systems according to labeling specific for use in these systems. However, excessive use or accidents may pose risks. No pesticide should be regarded as 100% risk free.

Since pyrethrins and permethrin are toxic to all insects, they may kill beneficial insects such as honeybees, ladybugs, butterflies and other non-target species. In addition, permethrin is very highly toxic to fish.

Chemical Information

Click here for product information on chemicals used for spraying.

Tips to Rid Your Community of Mosquito Breeding Sites

    1. Clean rain gutters to allow water to flow freely.
    2. Remove old tires or drill drainage holes in tires used for playground equipment.
    3. Store plastic wading pools inside or turn them upside down when not in use.
    4. Turn over or remove clay pots and plastic containers.
    5. Dispose of all empty beverage containers, plastic wrappers, discarded toys, etc.
    6. Check for trapped water in plastic or canvas tarps used to cover boats, pools, etc. Arrange the tarp to drain the water.
    7. Pump out bilges in boats. Turn canoes and small boats upside down for storage.
    8. Replace water in bird baths at least twice a week.
    9. Remove pet food and water dishes that are not being used.
    10. Flush livestock water troughs twice a week.
    11. Don't leave garbage can lids lying upside down. Be sure water does not collect in the bottom of garbage cans.
    12. Flush water in the bottom of plant holders twice a week.
    13. Fix dripping outside water faucets.
    14. Turn wheelbarrows upside down when stored outside.
    15. Check around construction sites or do-it-yourself improvements to ensure that proper backfilling and grading prevent drainage problems.
    16. Check ornamental ponds, tree holes and water-holding low areas for mosquito larvae. Call the nearest Mosquito Control Office (see below) if you find, or suspect, mosquito larvae are present.
    17. If ditches do not flow and contain stagnant water for one week or longer, they can produce large numbers of mosquitoes. Report such conditions to a Mosquito Control Office. Do not attempt to clear these ditches because they may be protected by wetland regulations.
    Harmful if swallowed. Harmful if absorbed through skin. Avoid contact with skin, eyes or clothing. Causes moderate eye irritation. Prolonged or frequently repeated skin contact may cause allergic reactions in some individuals.
    IF SWALLOWED: Immediately call a poison control center 1-800-214-7753 or doctor. Do not induce vomiting unless told to do so by a poison control center or doctor. Do not give any liquid to the person. Do not give anything by mouth to an unconscious person.
    IF ON SKIN OR CLOTHING: Take off contaminated clothing. Rinse skin immediately with plenty of water for 15-20 minutes. Call a poison control center or doctor for treatment advice.
    IF IN EYES: Hold eye open and rinse slowly and gently with water for 15-20 minutes. Remove contact lenses, if present, after the first 5 minutes, then continue rinsing the eye. Call a poison control center or doctor for treatment advice.
    IF INHALED: Move person to fresh air. If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth-to-mouth. Call a poison control center or doctor for further treatment advice.
NOTE TO PHYSICIAN: Product contains a petroleum distillate. Gastric lavage is indicated if material was taken internally. Vomiting may cause aspiration pneumonia.