The tire’s tread isn’t the only thing you should be looking out for, though– the sidewall is also a good indicator of potential tire problems. Inspect the car’s sides for cracks or cuts; being able to see these with your naked eye is a red flag that you should get it checked by a mechanic as soon as possible. Leaks might be the least of your problems in this case, since a ripped sidewall can make your tires prone to blowing out.
An efficient DC mechanic should be able to repair or replace your worn out tires for you. Don’t ignore any potential tire problem that you spot, unless you want to spend the better part of your morning calling a tow truck because your tires blew out in the middle of traffic.