Storm drains in Lexington aren’t a second sewer. They carry water from streets, roofs, and parking lots to local creeks without treatment, which is why rinsing a driveway into the street matters more than it looks. Most of the confusion comes down to three questions: whether plain water is okay, whether soap changes the answer, and what changes when a pro does the job. This guide answers all three.
Where Does a Lexington Storm Drain Go?
A Lexington storm drain sends water to a local creek with no treatment along the way, so whatever goes in comes out in the stream.
The city’s illicit discharge program says only rain water and snow melt should go into a storm drain, and it names soaps, solvents, concrete, and grease from cleaning work as pollutants.
That’s why the street is part of the problem. Water that leaves a driveway runs along the curb to the nearest inlet and carries whatever it picked up on the way: dirt, oil drips, soap, and leaves. A hose that looks harmless on a sunny afternoon sends a small stream of that mix to the creek, and a whole street doing the same thing adds up.
The state gives the same advice in plainer words. The Kentucky Transportation Cabinet’s stormwater page tells residents to never dispose of wash water into the street or stormwater drainage, including drains, ditches, and streams.
What Counts as Pollution in Wash Water?
Wash water counts as pollution when it carries anything besides rain, and most driveway and parking lot rinses do. The city’s list includes used motor oil, antifreeze, detergents, soaps, solvents, concrete, grease, and solids like soil, grass, leaves, mulch, and fertilizer.
A pressure washer makes that list longer in a hurry. It pulls oil out of concrete, lifts algae and mud off siding, and pushes gum, grit, and rust flakes down the slope. Bleach mixes and degreasers add chemicals on top, and loose paint chips, mulch, and sediment ride along with the water.
Which Rule Applies to Your Wash Water?
Plain Water and Light Dirt
A rinse of plain water still carries sediment, leaves, and grit, and the city lists those solids as pollutants. The state advises washing over grass or gravel where the water can soak in, and that works for light dirt on a driveway or walkway when the ground can take the water. A curb, a street, or a storm drain doesn’t count as soaking in. Slopes that run to the curb need the water caught first. Our guide to grass, plants, and pets explains how we protect lawns and plants while we work.
Soapy Water, Bleach, and Cleaners
Soap changes the answer, because the city lists detergents and soaps as pollutants even when the label says biodegradable. Eugene, Oregon’s pressure washing handout explains why: soaps, even biodegradable ones, can cause low oxygen levels in stream water. Bleach and other strong cleaners need even more care, and the state tells residents to never pour cleaning products into a storm drain.
Oil, Grease, Hot Water, and Parking Lots
Oil and grease need the most care of all. Used motor oil is on the city’s list, and a parking lot wash can carry oil, grease, and gum residue across a whole property. Hot water adds heat to the mix, and some sewer utilities set temperature limits for what they accept. Any wash that makes oily water needs the water caught and filtered. Lots and loading areas are where that matters most.
Dry cleanup is the easiest habit to build, because dirt you sweep up never becomes wash water. Stains are the harder part, and our concrete staining guide covers which ones need more than a rinse.
Wash water is one of 6 common problems we run into on Lexington properties. See the other 5 in our full guide to Common Pressure Washing Problems in Lexington.
What Should a Homeowner Do With Wash Water?
A homeowner should plan the water before turning the washer on. Sweep or vacuum first, because the Kentucky Transportation Cabinet’s advice starts with dry cleanup. Block any storm drain near the work area with a barrier that won’t cause flooding, and wash so the water runs toward grass or gravel that can soak it up. Rain on the way makes it a bad day to wash, since a storm pushes loose runoff straight to the curb.
Steep driveways need more help. A berm or strips of absorbent boom at the curb steer water toward the lawn, and a wet vacuum or small sump pump moves pooled water off the pavement. Contractors on trade forums describe the same fixes: dam the water, pump it back onto the property, or vacuum it into a barrel. A driveway that slopes toward the house is the easy case, and one that slopes toward the street is where hiring a pro makes sense.
What Do People Get Wrong About Wash Water?
The biggest mistake is treating runoff as unavoidable. Trade forum threads show contractors who say driveway runoff can’t be helped and others who say most people just let it go, and one reply puts it plainly: rules exist even where enforcement is light. Lexington’s page says only rain and snow melt belong in a storm drain, so the fix is to catch the water or let it soak in.
Other mistakes are smaller but common. Eco soap goes down the drain because the label says biodegradable. A drain gets blocked with a bag and the water just pools. Leaves get blown toward a catch basin, which the state asks residents not to do. A homeowner hires a pro and assumes the water is handled. Some cities, like Eugene, Oregon, hold the property owner responsible even when a contractor does the work, and Lexington’s page doesn’t say either way, so ask any contractor how they handle the water before the job.
Where Can Collected Wash Water Go?
Collected wash water can go to a lawn that can soak it up or to a sanitary sewer, but the sewer needs permission. Sanitary sewers lead to a treatment plant, and each utility sets its own limits. San Diego allows disposal through an onsite sink, toilet, or lateral cleanout, and a Maryland sewer utility allows it only at the customer’s site with the customer’s permission, never through a manhole in the public right of way.
The Lexington pages we reviewed don’t list a pressure washing rule for the sewer, so ask the city’s Water Quality division before sending wash water there. Utilities also tend to limit oil, grease, and high heat. The Maryland utility caps temperature at 140 degrees, limits oily waste, and asks for a screen to catch solids first. That’s why we filter solids and oil, and why commercial wash water goes to a sanitary sewer only where the owner and the utility allow it.
How Do Professionals Handle Wash Water?
A professional handles wash water by covering the storm drains, collecting the runoff, and sending it to the right place. On our jobs, the drains get covered first, and berms and pickup keep the water from leaving the work area. On a driveway or house wash, the water can also go to a lawn that can take it. Heavy grease gets a degreaser and hot water first, and we filter solids and oil from what we collect.
On commercial jobs, the water goes to a sanitary sewer only where the owner and the utility allow it, and nothing goes to a storm drain. A pro should be able to explain this plan before the job in plain words, and carry insurance in case something goes wrong. A vague answer such as “we use eco-friendly soap” doesn’t describe a plan.
How Do You Report Wash Water in a Storm Drain?
Wash water in a Lexington storm drain can be reported to LexCall at 311 or (859) 425-2255. The city asks for the location and a description of what you saw, and you can leave a phone number in case an inspector needs more details.
Reporting early helps, because oil sheens and soap suds move downstream fast. The city’s page lists the U.S. EPA, the Kentucky Department for Environmental Protection, and local regulations as the enforcement side, but it gives no fine amounts, so we don’t quote one.
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