Depends on the bills they get ! We partner up with a couple of DAF , highthroughput filtration , and wastewater package plant manufacturers to put together all sorts of filtration and onsite treatment systems . Some are big , traditional systems that occupy several acres with permanent buildings . Some come on a few semi trucks and get hooked up in hours with a couple of flex hoses . A few are small enough to fit onto a 10 foot trailer . I ' m working on a new design for very small facilities for 1000 GPD that ' s intended to be transportable via two suitcases . If the local WWTP doesn ' t care about the demands a business is placing on them , then there ' s no reason to treat the waste stream internally if it can be sent down the pipes . Eventually , many municipalities get a little peeved if a plant is dumping large volumes of wastewater that ' s constantly higher in biological oxygen demand BOD or organic solids than normal waste streams . They ' ll start billing based on the load imposed on the WWTP rather than the fluid volume . Treatment quality can vary tremendously . Sometimes you just need to improve water quality to the level of a normal waste stream , while other times you may be trying to meet EPA discharge requirements and skip the municipal WWTP entirely . One place was sending whole chicken breasts down the pipe , along with a slurry that was about 500 times the standard BOD load per gallon . The city WWTP was not amused at them . I ' ve gotten phone calls on a Friday night with halfserious inquiries if we can have a solution onsite on Monday morning after companies get those bills .