The best way to start answering this question is with the vehicles. All motor vehicles have certain limits on the weight they can tolerate, and the same goes to trailers attached to such vehicles, therefore when we specify for example, a maximum weight of 2 US tons (4,000 pounds), we do so to ensure we are safe driving out there. By that we include our drivers, pedestrians as well as drivers and passengers in other vehicles; all of the above we are protecting by ensuring that our own vehicles are being driven at capacity.
Also there are regulations on the items themselves that we can accept and this ties back to facilities where we can dump, being the County's Landfill, Transfer Station, Solid Waste and Garbage Disposal, etc. They all have their own set of rules, but for the most part coincide on a few universal principles.
Anything that is inflammable is strictly prohibited, simply because most of these places will process the waste and let an internal combustion process to occur or even provoke the combustion, if there is the presence of Chemicals, Fuel, Paint, Pressurized Contents or similar products, it could cause a fire or even an explosion.
Another important aspect is that these facilities charge per weight. Therefore a control in the weight is needed since we agree on a fixed rate prior-hand estimating the weight that will be disposed.
Similarly, items like Tires, Concrete, Bricks, Pavers, Metals, Batteries, Electronics, Toilets, Sinks, Pressurized Recipients and Tanks; are among another list of prohibited items and have a different treatment. In other words we can accept them but we need to separate them from regular waste. The biggest reason behind that is because they don't break normally or they don't burn, therefore causing a huge damage to the facilities and the equipment they use. Again we can dump them, but in specific places, so we ask you to let us know prior hand.
We hope that this explanation helps understand why we stress the 2 points of Weight and Items that go into our dumpsters.
Please stay tuned for more content to come soon.