For Tot swim lessons Try Arlington County Parks and Recreation.
I am taking Sat. morning Water-tots class at Washington - Lee HS pool.
The class is the best I have found ever!
The instructor has a great educational program for children as well as parents and my 2 year old is now swimming after only 2 sessions.
Instructor Liz is the best because she gives hands on class which is the only class that has your child swimming under water before age 3yrs. This was a big advantage to my now 3yr old to advance to the pre-fin class which allows no parents in the water with children.
My child is water safe and I can enjoy him swimming without the panic we both use to have. If you get a chance to sign up for one of these outstanding classes, you will definitely be impressed. Make sure you register early though, because there is a long wait list for her class after the first day of registration.
https://registration.arlingtonva.us is registration site make sure you get a house hold number before registration day!