Stormwater Mag has a new article on SWM Maintenance. Maintenance of Stormwater BMPs | stormh2o.com. Much to be said on this topic…. It is amazing that millions (billions???) of dollars of infrastructure goes in the ground and a small portion of it is maintained. … which results in increased pollution. It is the hidden pollution source of stormwater. Of course, we are a bit jaded, ’cause SWMaintenance is one of the things we do.