Pressure washing generates wastewater. That is an unavoidable physical reality of the work: water that contacts a surface picks up whatever is on that surface, and when the cleaning is done, that contaminated water has to go somewhere.
In California, “somewhere” is the question that creates regulatory exposure for operators who have not thought carefully about their wash water management. The rules are clear, and the enforcement is real: wash water containing oils, detergents, heavy metals, food residue, or other contaminants cannot legally discharge to a storm drain, a street gutter, a waterway, or any point that could lead to surface waters.
For commercial pressure washing operations throughout Southern California, setting up a compliant wash water reclamation system is not optional. It is a baseline operational requirement.
At PSI Products, we supply wash water reclamation systems, containment equipment, and commercial pressure washers to operators throughout California.
Here is a practical guide to understanding the regulatory framework and setting up a system that meets it.
Understanding the Regulatory Framework
California’s approach to wash water management is governed at multiple levels. At the federal level, the Clean Water Act prohibits the discharge of pollutants to waters of the United States without a permit, and storm drains in most California jurisdictions discharge directly to surface waters without treatment.
At the state level, the State Water Resources Control Board administers the National Pollutant Discharge Elimination System permit program and issues the stormwater permits that municipalities operate under.
At the local level, cities and counties enforce the conditions of those permits through their municipal stormwater programs, which in Orange County, Los Angeles County, and the City of Long Beach explicitly prohibit non-stormwater discharges to the storm drain system.
According to the California State Water Resources Control Board, operators who allow wash water to reach storm drains are subject to enforcement that can include cease-and-desist orders, civil penalties, and cleanup and abatement orders. Penalties for significant violations can reach tens of thousands of dollars per day per violation. The regulatory framework is not ambiguous, and it does not provide exemptions for small operators or for operators who claim they did not know the rules applied to them.
The Three Core Components of a Compliant System
A compliant wash water reclamation system for commercial pressure washing has three core functional components: containment, collection, and disposal.
1. Containment
Containment means physically preventing wash water from leaving the wash area and reaching any storm drain inlet, street gutter, or other pathway to surface waters. This is accomplished using portable containment berms, including flexible barriers that surround the vehicle or equipment being washed and retain the wash water within a defined area.
Drain plugs or inlet covers placed over nearby storm drain inlets provide supplemental protection. The containment system must be adequate for the volume of water being used and the terrain of the wash area.
2. Collection
Collection means physically gathering the contained wash water so it can be managed. Portable vacuum recovery units (wet vacuums or pump-equipped recovery systems) are used to collect the retained water from within the containment berms.
The collected water is transferred to a holding tank for subsequent disposal. The capacity of the collection system must be matched to the volume of water generated by the washing operation.
3. Disposal
Disposal means legally discharging the collected wash water to an appropriate receiving system. In most cases, this means the sanitary sewer, the municipal wastewater treatment system that actually treats water before discharge.
Disposing of wash water to the sanitary sewer typically requires preauthorization from the local sewer agency, which may impose limits on the concentration of oil and grease or other parameters that must be met before discharge.
Some operators use mobile vacuum trucks or arrange for third-party disposal of collected wash water. Discharging collected wash water to the storm drain — even after collection — remains prohibited.
Sizing and Configuring Your System
The appropriate size and configuration of a wash water reclamation system depends on the scale of your operation, the types of vehicles or equipment you are washing, and the typical contamination levels in your wash water.
A single-operator fleet washing business cleaning a handful of trucks per day has different needs than a commercial vehicle wash facility processing dozens of units.
PSI Products can help you evaluate the right combination of containment berms, recovery equipment, and holding capacity for your specific operation.
Our line of commercial pressure washers and wash water management equipment is specifically configured for California operators who need to meet the state’s stormwater compliance requirements without disrupting normal operations.
Contact PSI Products today to discuss your operation and find the right system configuration.
