Pressure washing company license requirements in Texas.

Not a state trade license — Texas does not license pressure washing. You do need normal business registration: a city or county business license and a sales tax permit. The bigger compliance question is where your wash water ends up.

Generally yes. Under the federal Clean Water Act it is illegal to discharge pollutants into storm drains or waterways without authorization, and nearly every municipal stormwater ordinance separately prohibits washing pollutants into the storm system. That local ordinance is the rule inspectors cite most often.

The standard practice is to capture it and dispose of it properly — to the sanitary sewer with permission, to landscaping, or to a disposal facility. Containment mats or berms and wash-water recovery equipment are the usual setup. Because mobile operators cannot pre-permit each site, capture and disposal is the practical route rather than an NPDES permit per location.

Many do. Municipalities commonly require environmental or wastewater discharge permits for washing regardless of state rules, so check at the city and county level rather than assuming the absence of a state license means no requirements.