Does the wash water go into the storm drain?

Start with what the county code allows to reach its drains, because that list is specific. Sec. 54-72(4) of the county's Water Pollution Control and Prevention Ordinance exempts a set of discharges “provided they do not cause a violation of water quality standards.”

The list includes water line flushing, rising ground water, air conditioning condensation, springs, neutralized swimming pools and pool overflow from properly functioning systems, firefighting activities, “uncontaminated roof runoff” and “any other water source not containing Pollutants.” It carries one washing item, and a narrow one: non-commercial washing of vehicles or boats, with phosphate-free cleaners of the kind the code describes.

No listed item is building or roof wash water from a working crew. The roof item is runoff that is uncontaminated, which is rain off a roof, not wash water, and every item on the list is conditioned on water quality standards. The code also sets a burden that runs the other way: after the County reasonably determines there is a pollutant discharge violation, “it is the responsibility of the discharger to prove the Discharge does not contain Pollutants.”

The exemptions matter because of how the code frames the problem. Sec. 54-65 defines an illicit discharge as substances not composed entirely of stormwater that may enter a stormwater management system or waters of the state, except as exempted in Sec. 54-68 and Sec. 54-72. The ordinance reaches the unincorporated county, and a city only if its governing body agrees by resolution. Whether the City of Naples has agreed is not settled by the code as read here, and the city is the one to ask.

With the exemptions set aside, the prohibition is blunt in both codes.

Collier's Sec. 54-67 reads “Discharge of Pollutants is prohibited” and makes it unlawful to discharge pollutants into surface water, canals, lakes, ponds, drainage ditches, ground water, wetlands, onto the ground, “or into a Stormwater Management System (SMS).” The ordinance defines that system as the public or privately owned conveyances, including roads with drainage systems and detention and retention ponds, down to the “catch basins, curbs, gutters, ditches, man-made channels, or storm drains” used for collecting, storing, treating or conveying stormwater. In that definition the stormwater system takes in the curb and the gutter, not only the grate.

The City of Naples writes its own version. Sec. 42-5(b) makes it unlawful for any individual, partnership, corporation or other entity to “discharge pollutants into any bay, lagoon, estuary, or other waterway, lake, pond, drainage ditch, or part of the city's stormwater conveyance system.” Sec. 42-5(a) defines pollutants to include “detergents or surfactants used to disperse other pollutants.” As the city code was read, Sec. 42-5(c) has four exemptions, a fuel tank overfill sheen, herbicide application for algae or plant blooms, an ordered washdown of an accident scene and the sheen from a sunk vessel, and none of them is building or roof wash water.

The editions read were Collier Supplement 126, updated online July 9, 2026, and Naples Supplement 74 Update 1, updated online July 13, 2026.

The city's Streets and Stormwater division put the rule in six words across the top of its pollution prevention page: “ONLY RAIN DOWN THE STORM DRAIN.”

That page, as archived on March 19, 2022, states that “Illicit Discharges are prohibited,” that it is illegal to dump pollutants of any kind into storm drains, ditches, canals, streams or bays in the city, and it defines an illicit connection to include any conveyance that allows non-storm water, including “wash water to enter the storm drain system.” It asks residents to report paint, soap or other pollutants going into a storm drain to Code Enforcement, and one image on the page carries the label “Power washing soap entering stormdrain.”

FDEP's guidance shows what keeping wash water out of a drain looks like in practice, including where it can fail.

The document is FDEP's recommended practice for mobile vehicle and equipment washing, not a rule for house or roof washing. Before washing, it recommends identifying every stormwater drain, grassy swale, ditch and sanitary sewer manhole at the wash area, and observing the slope of the ground to find where wash water can be contained “without the possibility of release of a pollutant into the waters of the state of Florida.” Its containment methods include these:

• Storm drain covers and mats sit on top of the grate to seal it, so the water collects on the drain “until it can be collected and properly disposed.”
• Protective barriers go around a drain to keep water out of it. FDEP warns that berms “can be ineffective or less effective when the storm drain is located at the bottom of a slope or if there is a large amount of wastewater generated.”
• Onsite swales are, in FDEP's words, “Shallow, grassy low areas designed to collect runoff and allow it to seep into the ground without discharging to a stormwater system or to otherwise leave the site.”

Behind the methods is FDEP's disposal line: discharging wastewater to stormwater systems, such as drains, ditches and retention areas, or to surface water “is prohibited without an NPDES wastewater permit,” and FDEP recommends the sanitary sewer where practicable, with the utility's prior approval. FDEP's ninth practice, washing vehicles on an impermeable surface so the water can be collected, and the county's rule sending washing water to a pervious surface or a recycling or reuse system are separate documents with separate scopes, and they are not read here as one instruction.

A driveway that slopes to the street puts the grate at the bottom of a slope, the case FDEP's caveat names for barriers, and water on the slope runs toward it. The water rules that apply to a paver driveway are set out on the paver cleaning page.

Whether a particular stream of wash water broke a particular code is not decided by a code summary, a homeowner or a cleaner.

• In the unincorporated county: the county's Pollution Control section, under the code whose burden rule is quoted above.
• In the City of Naples: the city's Code Enforcement Division, which the city's archived page lists at 239-213-5030, and the city itself on whether the county's Chapter 54 applies there.
• A spill with offsite environmental impact or of significant volume: FDEP's guidance says to report it to the local FDEP District Office or the city or county environmental program as soon as possible.

The drain is only one of the places wash water can go. The county's washing rule says the water “must drain to a pervious surface or to a water recycling/reuse system,” and what that means on the ground, limits included, is set out under what happens to the runoff from roof cleaning. Whether the job itself needs any paperwork is a separate matter, answered in whether a permit is needed for exterior cleaning.