How to Kill Mosquitoes in Water Fountains

Get rid of mosquitoes in a fountain by killing their larvae with a pet-safe larvicide that dissolves in water. It does not harm mammals, birds or fish.

Female mosquitoes lay their eggs in fountains, as well as ponds and any other places around your yard that hold or collect water.  Keep the fountain pump on to circulate water, which makes your fountain less attractive to mosquitoes. A natural, pet-safe mosquito-killing tablet decimates existing larvae before they hatch into mosquitoes. 

Getting Rid of Existing Mosquito Larvae

Using BTi Mosquito Larvicide

Most BTi tablets are made for small ponds and the usual dose is one disc for each 100 square feet of water surface, which covers most fountains.  Read the larvicide packaging as products vary.

Place one mosquito [larvicide disc](http://wwwplanetnaturalcom/wp-content/uploads/2013/04/mosquito-dunks-faqpdf) in the fountain, or in each level of the fountain, if more than one level contains water at all times.  For fountains with significantly less than 100 square feet of water surface, **break the disc** first and use only one-half a disc or less for each area. The discs float for a while and eventually sink, mixing in with the water.  Mosquito larvae eat the BTi and it kills them before the become adult, biting mosquitoes.


Add fresh larvicide to the fountain **every 30 days**, or whenever you replace the old water with fresh water.

Adult mosquitoes don't live in the water, but are naturally drawn to it and lay their eggs in it.  Controlling the larvae as they hatch prevents more mosquitoes from terrorizing your yard. To kill the larvae, add mosquito larvicide tablets to the fountain.  These larvicides are made from bacteria, _Bacillus thuringiensis israelensis_, also known as BTi. BTi, found naturally in soil, targets mosquito larvae specifically and is not harmful to mammals, birds or fish. 

Natural Ways to Nix Mosquitoes

Besides the larvicide treatment, the best way to **prevent mosquitoes** is to make the fountain area less attractive to them. 

* Keep the fountain **pump** on at all times -- mosquitoes prefer to lay eggs upon still or stagnant water
* If you don't use the fountain, **empty it and cover it** to prevent water from collecting when it rains  * **Trim** back any [tree branches and overgrown plants](http://ucanredu/blogs/blogcore/postdetailcfm?postnum=10847) that may serve as hiding places for adult mosquitoes.    * **Empty** plant pot trays, pet dishes and other objects that collect water  * Replace water in birdbaths or kiddie pools every several days to **prevent stagnant water** that attracts mosquitoes.

Things You Will Need

  • Two 2-gallon buckets
  • Water
  • One cup of bleach
  • Three rags
  • BTI (bacillus thuringiensis israeliensis) in pressed cake form

About the Author

Kathy Adams is an award-winning writer. She is an avid DIYer that is equally at home repurposing random objects into new, useful creations as she is at supporting community gardening efforts and writing about healthy alternatives to household chemicals. She's written numerous DIY articles for paint and decor companies, as well as for Black + Decker, Hunker, Landlordology, SFGate and others.