Washington is currently offering a rebate program for rain barrels. Here is a link to their site.
Here is some info from their site:
How much is the rebate?
$100—For rain barrels that hold 75 gallons or more
$50–For rain barrels with a capacity of 50-74 gallons **
* Limit of two (2) rain barrel rebates per property
**Rain barrels less than 50 gallons are not eligible for rebate
Why is the District government offering rebates on rain barrels?
Rooftops comprise a large percentage of the impervious area in Washington, D.C. Rain water that flows off impervious surfaces such as rooftops, driveways, and roads flows over these surfaces to our streams, picking up pollutants on its way. In addition to water conservation, rain barrels help the environment in two ways: by allowing water to seep back into the ground slowly, naturally filtering the water and recharging the water table; and by reducing the amount of water going into our streams and rivers during heavy storms, easing stream erosion.
I just bought and installed an 80 gallon rain barrel. I’m very happy with it. That’s 80 gallons less water in the sewers during the most recent flood. My barrel cost about $200.00 and qualifies for the $100.00 rebate.
I bought my barrel from a company called Aquabarrel. It’s located out beyond Gaithersburg, about one hour from Bloomingdale. The guy runs this company out of a shed in his back yard. He is very knowledgeable about rain barrels. He has several different styles, just make sure to get one of the DC approved models, and make sure that you have a vehicle large enough to hold the barrel. He can also sell you parts that you may need to connect the rain barrel to your existing system. Here is a link to his web site.
Every gallon of rainwater removed from the sewer system will reduce the amount of flooding we are experiencing and you can use the water later to water your garden. I’m actually considering adding a second barrel to my system.