Indiana runoff rules for pressure washing and bins

Pressure washing and bin cleaning both produce wash water, and Indiana has written down where it can and can't go. The storm drain is on the can't list. Here's the rule as the state and Indianapolis have published it, the three legal options, and what a compliant residential rig and a compliant bin truck look like under it.

What the state says

The Indiana Department of Environmental Management publishes a fact sheet on power washing, and it's the whole state-level answer.

Storm sewers and drains are conveyances to what Indiana Code calls waters of the state, and nothing in them is treated. Wash water carries detergent, oil, solids, metals, and, if you've stripped a deck, paint. So it can't go down the drain. The sheet says it in as many words: do not assume you are authorized to discharge power washing wastewater into the storm sewer system.

It gives three legal places for the water to go:

1. Into the sanitary sewer, with approval from the local wastewater utility. The state recommends getting that approval in writing.
2. Collected and transported to the wastewater treatment plant.
3. Onto soil on the property, with no chemical additives, until the ground is saturated or the water starts to run off.

The sheet also lists the collection methods it considers acceptable: wet/dry vacuums, sump pumps, berms made of sandbags or capped fire hose, containment pads, and commercial recovery systems. Paint chips from stripping may count as hazardous waste under a separate rule.

What Indianapolis says

Indianapolis runs its own stormwater program under the state's municipal storm sewer permit. It covers Marion County except Beech Grove, Lawrence, Southport, and Speedway, which have their own rules. The Marion County Public Health Department investigates complaints for the city, and its rule is short: the only things allowed into a storm drain are rainwater, snow and ice melt, lawn watering, and sump pumps discharging rainwater or groundwater. Anything else is an illicit discharge.

Carmel and Fishers run separate programs with the same rule. Carmel's stormwater page states that wash water in the gutter or storm drain is illegal, with an exemption for residential car washing and building washdown that uses no detergent.

One piece of local geography matters. Much of old Indianapolis sits on a combined sewer, where the street drain and the sanitary line share a pipe to the treatment plant until heavy rain overflows it into the river. Carmel, Fishers, and most newer neighborhoods run separated systems, where the street drain goes straight to the creek. The rule is the same in both. The suburban drain is just the one with nothing between it and the water.

The residential setup that's legal here

The state's option three is the cheap one, and it's a rig operators already use: block the drain with sandbags or water berms, set a sump pump at the dam, and run the discharge hose to a lawn or bed on the property. A burlap pre-filter catches the solids. The whole setup costs a couple hundred dollars plus a small generator or power bank.

The state's condition is no chemical additives, so this covers plain-water driveway, siding, and concrete work. A house wash with bleach or detergent in the mix doesn't qualify for soil discharge. That water needs to go into totes and then to the treatment plant, or into a sanitary clean-out with the utility's permission, which is options two and one.

In Indianapolis and most of the surrounding counties, the sanitary utility is Citizens Energy Group. It hasn't published a policy for mobile washers, so call before you rely on a clean-out and get the answer in writing, which is what the state recommends anyway.

How enforcement works

Indiana's stormwater enforcement is complaint-driven. The county health department publishes a reporting line, and the complaints that reach it come from neighbors and property managers. The jobs that draw regulators on their own are the ones with oil, grease, and visible chemicals: gas stations, dumpster pads, parking garages.

That's the shape of the risk. A plain-water driveway job pumped onto the lawn is legal. A bleach wash running into the gutter is an illicit discharge in every Indianapolis-area jurisdiction, and complaints usually arrive with a photo.

There is a real cost to doing it right. Setting up a berm and pump turns a one-hour job into closer to two. A truck-mounted reclaim system runs $15,000 to $20,000, and that's the version commercial and municipal bids require. For residential work, the $200 rig covers plain-water jobs and totes cover the rest.

Bin cleaning under the same rules

Trash-bin cleaning produces the same wash water with worse contents, and nothing in Indiana's rules carves it out. Water that has been through a garbage can is wash water with solids and whatever was in the can, and the three options above are its only legal destinations.

In practice that means a tank-based or closed-loop rig. The water goes into a holding tank on the truck, never onto the street or down the customer's storm drain. Deodorizer applied after the wash is fine. Detergent or bleach in the wash water takes soil discharge off the table under the no-additives condition, so the tank has to go to a sanitary line or the treatment plant either way. Emptying it at the shop into a sanitary drain requires the utility's permission, same as a pressure washer's clean-out. Hauling it to the plant is the other option.

A bleach-based sanitizer applied to bins may also be a pesticide-application question, which is covered in the licensing post.

On the quote

Put one line on the quote saying how wash water is handled. Commercial and municipal bids ask for it. Homeowners rarely do, but it costs nothing to say, and it's the line a property manager checks before hiring you for the lot.