Before you schedule a mobile cleaning, pressure washing, fleet washing, or exterior-maintenance route, identify the government office that handles wastewater and stormwater in the places you will work. The U.S. Environmental Protection Agency’s National Pollutant Discharge Elimination System information explains the federal framework for certain discharges, while USA.gov can help you locate state and local government contacts. Requirements can vary by state, county, city, sewer district, site, and type of discharge, so confirm locally before your first job.
A business can be ready to wash, clean, or maintain property and still be unprepared for the wastewater it creates. The first route is when assumptions become real decisions. Water may flow toward a storm drain, sanitary sewer, landscaped area, private treatment system, ditch, or neighboring property. Each destination can involve a different rule, office, approval, or best management practice.
The goal of your first calls is not to sound like an expert. It is to give the right office enough clear information to tell you what applies. A short, accurate description of your work can prevent a costly mistake, a rejected discharge, or a job that must be stopped halfway through.
Who should you call first?
Start with the local office that manages wastewater, stormwater, or sewer connections in the area where the work will occur. Depending on the location, this may be called a pretreatment office, industrial pretreatment program, wastewater utility, environmental services department, public works department, stormwater division, drainage authority, or water-quality office.
If you are not sure which department has authority, call the city or county’s general information line, public works department, or business assistance office. You can also use USA.gov to find state and local government contact information. Ask to be transferred to the person who handles commercial wastewater discharges or mobile washing operations.
For jobs outside your home jurisdiction, repeat the process. The office that answers your questions at your shop may not control a different city, county, sewer system, or property.
What is the difference between pretreatment and stormwater?
Pretreatment generally concerns wastewater entering a sanitary sewer system before it reaches a publicly owned treatment works. A local sewer utility or pretreatment program may review discharges from businesses and may require controls, sampling, records, or approval before certain wastewater enters the sewer.
Stormwater concerns runoff or other water that reaches a storm drain, drainage channel, creek, river, lake, or similar surface-water pathway. Storm drains commonly have a different destination from sanitary sewers. Sending wash water into a storm drain is not automatically acceptable because it may bypass the type of treatment provided by a wastewater plant.
These categories can overlap. A job may involve sanitary sewer discharge, stormwater exposure, hazardous materials, sediment, or more than one regulator. Do not decide that a discharge is acceptable merely because the water looks clear.
What should you say when you call?
Use a short description that answers five basic questions:
- What service do you provide?
- Where will the work occur?
- What products or equipment will you use?
- How much water may be used?
- Where do you propose to collect, reuse, discharge, or dispose of the wastewater?
For example, you might say: “I operate a mobile exterior-cleaning business. I will wash commercial buildings, parking areas, equipment, and vehicles at customer sites. I am trying to determine whether the wastewater may enter a sanitary sewer, whether stormwater controls are required, and whether I need an approval or written procedure before starting.”
Be specific about detergents, degreasers, disinfectants, fuels, oils, paint residue, food residue, animal waste, heavy sediment, or other materials that could be present. If you do not know the expected volume, give a reasonable estimate and say that it is an estimate.
Should you call the stormwater office or the sewer utility?
Call the sewer utility or pretreatment office when you want to discharge collected wastewater to a sanitary sewer. Call the stormwater or environmental office when water may reach a storm drain or surface water, when runoff cannot be fully captured, or when the site has special drainage controls.
If you are unsure, call both or ask one office to identify the other agency. A sewer utility may control the sewer connection but not the public storm-drain network. A stormwater office may explain runoff controls but not authorize a discharge to a sanitary sewer.
Ask whether the property owner, tenant, general contractor, or your company is responsible for obtaining permission. The answer may depend on the site’s sewer connection, lease terms, construction status, or existing permits.
Do you need a permit before the first route?
Do not assume that every mobile washing business needs the same permit, and do not assume that no permit is needed because you are a small operator. The answer can depend on the work, discharge path, substances present, location, business structure, and local program.
Ask the responsible office these questions:
- Is a permit, authorization, registration, or written approval required?
- Does the requirement apply to the business, the property owner, or both?
- Is there a threshold based on discharge volume, frequency, location, or material?
- Does the rule change for restaurants, vehicle fleets, construction sites, industrial facilities, or municipal properties?
- Is a federal, state, regional, or local program involved?
- What must be completed before work starts?
The EPA’s NPDES resource is useful background for understanding federal discharge permitting, but it does not replace a conversation with the authority for the particular site. Ask for the program name, application instructions, and the office that makes the final determination.
Can wash water enter a storm drain?
Treat this as a question for the local stormwater authority, not as a field judgment. In many locations, storm drains are intended for stormwater rather than commercial wash water. However, the exact rule and acceptable controls depend on local requirements and the nature of the discharge.
Before the route, learn where nearby drains lead and how the office expects you to protect them. Possible controls may include drain covers, berms, vacuum recovery, temporary containment, diversion, dry cleanup, filtration, or collection for approved disposal. The correct method depends on the site and the material being removed.
Never place a cover over a drain without considering flooding, traffic, safety, and the direction of incoming water. Ask the local office whether the proposed control is acceptable and whether a trained person must monitor the work.
Can you discharge collected wastewater to a sanitary sewer?
Ask the sewer utility before connecting hoses, pumps, or tanks to a sanitary sewer. A utility may have limits on what can be introduced, may require pretreatment, or may direct you to a specific discharge point. Permission from a property owner is not necessarily permission from the sewer authority.
Provide the utility with the expected wastewater source and contents. Explain whether the water comes from building washing, vehicle washing, concrete cleaning, food-service areas, equipment cleaning, or another activity. Mention oils, solids, chemicals, metals, disinfectants, and unusual residues.
Ask whether you must filter solids, separate oil, measure pH, sample the water, use a designated connection, or keep discharge records. Get the instructions in writing when possible. If the utility gives verbal guidance, record the employee’s name, date, phone number, and a careful summary of what was said.
What if the customer says the discharge is allowed?
A customer may know the property well, but the customer’s approval is not a substitute for confirmation from the agency or utility that controls the discharge. Ask the customer for the site’s sewer and stormwater contact, existing authorization, drainage map, or written procedure. Verify the information yourself.
Put responsibility in the service agreement without promising an outcome you cannot control. You can state that the customer must identify available utilities and disclose site restrictions, while your company will follow applicable instructions and will not intentionally discharge wastewater without an approved method.
If the customer insists on sending wash water into a drain and you cannot verify that the practice is allowed, pause the work. A lost job is usually easier to manage than an avoidable compliance or cleanup problem.
What records should you keep after the call?
Create a jurisdiction file for each city, county, sewer district, or service area. Keep the office name, phone number, email address, website, contact person, date of contact, questions asked, answers received, and any forms or guidance supplied.
Also keep a copy of your service description, product safety information, discharge plan, training notes, photographs of controls, disposal receipts, and completed route checklists. If the office gives you a document, save the original file rather than relying only on a web page that may later change.
Records should help someone understand what you believed, why you believed it, and what you did at the job. Avoid writing “approved” unless the agency actually used that term. A more accurate note may say, “Staff member explained that the proposed method should be reviewed by the sewer utility before use,” or “Office directed us to submit the listed form.”
How much should you budget for compliance questions?
Budget separately for advice, equipment, training, permits, sampling, disposal, and unexpected site controls. The first phone call may cost nothing, but local applications, plan review, laboratory work, hauling, or disposal can create costs ranging from tens to several hundred dollars, and some projects may cost more.
These are planning ranges, not quoted fees. Do not publish a fixed compliance price until you confirm the local requirements and the job conditions. Ask the agency or utility for its current fee schedule and ask whether fees apply to your business, each site, each discharge, or each application.
Equipment costs also vary. A basic route may require containment and recovery supplies, while another may require larger tanks, pumps, filtration, testing equipment, or a disposal arrangement. Price the equipment after you understand the discharge method, not before.
What should be ready before you make the call?
Prepare a one-page operating summary. Include your business name, service area, typical customers, work types, products, equipment, estimated water use, expected wastewater, and proposed collection or discharge method.
Include photographs or a simple sketch showing how you expect to protect drains. Mark sanitary sewer access, storm drains, sloped areas, loading zones, landscaped areas, and places where water could leave the site. You do not need an elaborate engineering drawing for an initial conversation, but you should be able to explain the water path.
Bring product labels and safety information for detergents and chemicals. If you use several products, list them separately. The office may ask about concentration, intended use, storage, spill response, or whether a product is biodegradable. Do not describe a product as harmless unless you can support the statement.
What questions should you ask about chemicals and solids?
Ask whether the office has special instructions for oil, grease, fuel, paint, concrete residue, heavy metals, food waste, disinfectants, acids, caustics, or other contaminants. The same cleaning method may be treated differently depending on the surface and residue.
Ask how to handle collected solids. Sludge, swept debris, filters, absorbents, and contaminated materials may need separate containment and disposal. Do not pour settled material back into a drain or spread it onto the ground unless the responsible authority specifically allows that practice.
Keep chemical containers labeled, closed, and secured during transport. Train employees to stop work when they find an unknown substance, a spill, damaged drainage infrastructure, or a discharge path that differs from the site plan.
What should happen during the first route?
Use a pre-work inspection before turning on the water. Locate drains, observe the slope, check for standing water, identify nearby surface waters, and confirm the proposed collection point. Ask the customer about recent spills, maintenance work, or unusual materials on the surface.
Start with dry cleanup where practical. Sweep, collect loose debris, and remove absorbable material before washing. Position recovery equipment before water is released. Keep hoses and tools arranged so workers do not trip or create an uncontrolled flow path.
Stop if water escapes the containment area, equipment fails, a storm begins, or the material being removed is different from what the customer described. Record the condition and contact the customer or appropriate office before continuing.
What should your written procedure include?
Your procedure should identify who inspects the site, who places controls, who monitors wastewater, who stops the job, and who decides how collected water will be handled. Include a simple escalation process for spills, blocked drains, unknown contaminants, equipment failure, and customer pressure to use an unverified method.
Include a route checklist with these items:
- Jurisdiction and local contact confirmed.
- Discharge path identified.
- Storm drains and sanitary sewer access located.
- Products and residues reviewed.
- Containment and recovery equipment inspected.
- Customer instructions documented.
- Wastewater destination confirmed.
- Records and disposal documentation assigned.
Review the procedure whenever you add a service, work in a new jurisdiction, change products, buy new equipment, or receive different instructions from a utility or regulator.
How can you confirm the answer locally?
Use the federal information at EPA.gov for background, then contact the state, county, city, sewer utility, or stormwater program responsible for the actual location. Ask for the current office, form, guidance document, or written determination that applies to your work.
Confirm again when the property changes, even if the job seems identical. A hotel, factory, apartment complex, restaurant, parking garage, and private residence may have different drainage and wastewater arrangements. The safest route is the one planned around the actual site, not a generic assumption.
Make the calls before advertising a universal service promise such as “we can wash anywhere” or “all wastewater is safe to drain.” A reliable operator knows where to ask, describes the work honestly, documents the response, and confirms locally before the first route.