These are some common examples of places where water collects.

Check sources around your home to prevent mosquito breeding. 

Stagnant water in a small birdbath.

Stagnant water in a rain gutter.

A large, decorative cement pot filled with water and aquatic plants.

A plastic kiddie pool filled with dirty stagnant water.

Stagnant water with algae in a neglected pool.

Stagnant water in a large bird bath.

Stagnant water on the bottom of an upside down plastic garbage can.

Stagnant water inside of a PVC pipe sticking out of the ground.

Stagnant water in a metal pail.

Small pocket of water in the folds of plastic construction sheeting on the ground.

Top view of a bromeliad plant with water collected at the top.

A water puddle in a street gutter.

Water collected in a discarded plastic bag on the ground.

Ceramic plate filled with water under a large potted plant.

Stagnant rainwater that has collected in a pocket created in the folds of plastic construction sheeting.

Freshly cut stalks of "Lucky bamboo" kept in plastic buckets filled with water