Exit sign disposal Chicago: why those glowing signs are more complicated than you think

An older woman called the blog last month, very upset. She had been clearing out the office building her late husband had managed for thirty years, and a hazardous-waste contractor had quoted her almost three thousand dollars to dispose of eleven exit signs. "Eleven plastic signs," she said. "How can that possibly be right?" The answer is: it depends on what is inside those signs. And in her case, it was probably right.

If you manage a commercial building in Chicago — or you have inherited one from someone who did — you need to know that not all exit signs are created equal. Three different technologies are sitting on three different ceilings in the average mid-sized office, and they all have to be disposed of differently.

The three kinds of exit signs

Electric (LED or incandescent)

These are the ones you can probably handle yourself. They run off building power, usually with a small battery backup. The lamps inside might contain trace mercury (if they are old-style fluorescent), but the units sold in the last fifteen years are LED. When you take them down, you have two waste streams: the unit itself (mostly metal and plastic — recyclable as e-waste through the Illinois Electronic Products Recycling and Reuse Act) and the backup battery, which goes through normal battery recycling.

Photoluminescent

These are the green-tinted plastic signs that don't need any power at all — they absorb ambient light and re-emit it. Totally inert. You can throw them in the dumpster. (You shouldn't, because there are construction-debris recyclers who will take the plastic, but you can.) These started becoming popular in stairwells after 2009. If you have one, it has a UL 924 marking on the back.

Tritium (self-luminous)

Here is where things get expensive. A self-luminous exit sign uses small glass tubes filled with tritium gas — a radioactive isotope of hydrogen — coated on the inside with phosphor. The tritium beta-decays into helium, and the energy excites the phosphor, and you get a green glow that requires no electricity and no maintenance. They are popular in places where running wiring is hard (industrial mezzanines, parking decks, mothballed equipment rooms). And they are technically a piece of byproduct material regulated by the Nuclear Regulatory Commission.

You can identify a tritium sign three ways:

• It glows in the dark with no power supplied to it.
• It has a yellow-and-magenta trefoil (the radiation symbol) on the back, plus a label saying "Caution: Radioactive Material" with a curie reading (typically 5–25 Ci).
• There is an NRC general license number on the manufacturer's plate, along with disposal instructions.

What the NRC general license actually means

When a building bought a tritium exit sign, the seller automatically transferred a general license to possess it under 10 CFR 31.5. There is no paperwork to file unless something goes wrong. But that general license comes with one binding obligation: when you remove the sign, you must transfer it back to a specific licensee — usually the original manufacturer or a licensed broker — within a defined window. You cannot throw it in the dumpster. You cannot give it to your usual scrap-metal guy. If you damage one during removal, you have to notify the NRC within 30 days.

The first time a building manager learns any of this is usually the day they break one. There is no good day to learn this.

Most manufacturers run mail-back programs. SureLites, Isolite, Lite-Lume, Brady — they will all take their own signs back. Cost is typically $100–$250 per sign, plus shipping (which is not trivial, because the signs ship as Class 7 radioactive material). For a building with a handful of signs, the mail-back is usually the cleanest route.

What Chicago facility managers actually do

For a building with a mix of exit-sign types, two batteries' worth of e-waste, some fluorescent tubes, and the assorted other oddities of a thirty-year-old office, it usually doesn't make sense to handle each waste stream separately. The cleaner approach is to schedule a single pickup with a Chicago commercial hauler that handles both regulated waste and standard hazardous waste disposal Chicago facility services. You get one manifest, one set of paperwork, and the radioactive items get routed to the appropriate downstream processor.

There are several outfits in the Chicagoland region that do this; American Waste Haulers is one I have personally used at a former job for a routine clean-out. There are others. Get two or three quotes — pricing on radioactive removal varies a lot, and not always in proportion to the number of signs.

The wider category: radioactive source disposal & recycling

Exit signs are the most common small radioactive source in a typical commercial building, but they aren't the only one. Older fire-detection systems used radioactive ionization elements. Some industrial gauges use Cs-137 or Co-60. Antique medical equipment occasionally has residual sources. The general rule is the same: anything with a trefoil symbol on the label belongs in the radioactive-source disposal and recycling stream, not the regular hazardous-waste stream, and the chain of custody matters more than the volume.

The 90-day window

One last thing, and this is the rule I have seen ignored most often: under 10 CFR 31.5(c)(5), if you transfer a tritium exit sign to a person who cannot legally accept it (your scrap-metal guy, a landfill, a dumpster), you have violated the general license. The transfer has to happen within a defined timeline — generally to a "specific licensee" — and you should keep the paperwork. Your contractor, if they are doing this right, will give you a copy. Keep it in the facility file.

If you read all of this and your reaction is "I just have one sign in a back hallway," call the manufacturer. They will mail you a return kit. It will take you twenty minutes and cost less than the consultant who would otherwise be writing you a memo about it.