Rules

What Can and Cannot Go in a Dumpster: The Local List

Most of what comes out of a Maricopa house or yard is fine. The exceptions are worth knowing before you are standing in a garage at six on a Saturday morning.

The short version

If it came out of a building, a yard or a household and it is solid, non-hazardous and not under pressure, it can almost certainly go in the container. If it is liquid, toxic, pressurised, electronic or contains refrigerant, it cannot.

That covers about ninety-five percent of questions. The rest of this is the other five percent, which is where the money and the headaches live.

What you can put in

Household and furniture

Sofas, armchairs, mattresses, bed frames, tables, wardrobes, bookcases, desks, carpet and underlay, rugs, window coverings, toys, books, paperwork, kitchenware, patio furniture, grills with the propane tank removed, exercise equipment and general clutter.

Construction and renovation debris

Drywall, timber, plywood and sheet goods, doors, windows, trim, kitchen cabinets, countertops, tiling, laminate and vinyl flooring, insulation, stucco, soffit and fascia, guttering, fencing and patio timber.

Masonry, block, concrete and tile

All fine, all extremely heavy. Block wall, concrete, pavers and roof tile belong in a 10 yard, part-filled, kept separate where you can — clean material has a cheaper route.

Roofing

Asphalt shingle, concrete tile, metal panel, felt and synthetic underlayment, flashing and decking. Weight is the constraint, not acceptability.

Yard and desert landscape debris

Branches, brush, palm fronds, cactus and succulent material, hedge trimmings, stumps within reason, sod, and general garden clearance. Old drip irrigation, emitters and poly tubing are fine too.

What is prohibited

• Liquids of any kind — paint, stains, solvents, thinners, oils, fuels and pool chemicals
• Batteries of every kind, lithium especially — a real fire risk in a loaded container and on a tipping floor
• Propane, gas and pressurised cylinders, including "empty" ones, and aerosols
• Electronics — televisions, monitors, computers
• Refrigerant-charged equipment that has not been professionally evacuated — and see the note on evaporative coolers below
• Asbestos-containing material
• Pesticides, herbicides and fertiliser
• Pool chemicals — chlorine, acid, shock — which deserve their own line in this market
• Medical and infectious waste, including sharps
• Tires
• Contaminated soil
• Fluorescent tubes and older ballasts

The grey areas people ask about

Pool chemicals

Common here and genuinely dangerous. Chlorine and pool acid are aggressive oxidisers and corrosives, they react badly with each other and with organic debris, and a container of dry timber is precisely the wrong place for them. Household hazardous waste, never the container.

Evaporative coolers

Still on plenty of Maricopa roofs and garages. A cooler with no refrigerant circuit is essentially a metal box, a pump and pads, and it can go in — drain it first. A refrigerated air conditioning unit is a different thing entirely and needs the refrigerant professionally evacuated.

Cactus and agave

Fine in the container. Worth a warning to whoever is loading: saguaro ribs, cholla and agave spines go straight through a work glove, and agave sap is a skin irritant for a lot of people. Long sleeves and proper gloves.

Palm fronds

Acceptable and bulky. Cut them down rather than loading them whole — a container fills alarmingly fast with intact fronds.

Treated timber

Acceptable in a mixed load, not in a clean-wood container. Patio, ramada and fence timber here is nearly always treated.

Old paint cans

Empty and fully dried with the lid off, generally fine. Anything with liquid paint in it is household hazardous waste. Worth noting the heat dries a part-used can far faster here than elsewhere — leaving the lid off in a garage in July does most of the work for you.

Scrap metal

Perfectly acceptable, but it has positive value, so pulling it out first usually pays. On acreage property clearances there is normally far more than people expect — fencing, irrigation pipe, equipment, old vehicles.

Heat makes some of this more dangerous

A section this list needs in Maricopa that it would not need elsewhere.

A steel container sitting in full sun through a summer afternoon gets extremely hot inside. Two practical consequences:

• Pressurised containers are worse here. An aerosol or a "nearly empty" propane cylinder that would merely be prohibited in a cooler climate is an active hazard in a closed steel box in July. Take them out of the pile before loading, not after.
• Lithium batteries fail with heat. Cordless tool packs, e-bike and scooter batteries and old phones are the ones we find. Damaged lithium cells in a hot container are a genuine fire risk, and a fire in a loaded roll-off is dangerous to the driver as well as expensive.

If you are clearing a garage in summer, pull the chemicals, cylinders and batteries in the cool of the morning and set them aside in shade before anything else moves.

Pool chemicals deserve their own warning

Backyard pools are close to universal in this city, so this comes up constantly and it is the one item on the prohibited list that can actually hurt somebody.

Chlorine products are strong oxidisers. Pool acid is strongly corrosive. Mixed with each other they react violently, and chlorine in contact with organic material — leaves, timber, rags, brake fluid — can ignite it. A roll-off container full of dry timber and cardboard in 110 degree heat is close to the worst place either could end up.

What to do instead:

• Keep chlorine and acid separated from each other the whole way, including in the car
• Leave both in their original containers with the labels intact
• Take them to household hazardous waste, never to a container and never to a bin
• Do not attempt to neutralise or combine anything yourself
• If a container has split or the contents have caked, say so when you hand them over

The same applies to a clearance where you find old, unlabelled tubs in a hot garage. Unlabelled pool chemistry is exactly the situation to hand to someone equipped for it rather than guess at.

Where the rest has to go

A pre-load checklist

• Walk the garage, shed and side yard and pull every chemical before anything else moves
• Pool chemicals first — chlorine and acid in their own place, well apart
• Check for batteries: power tools, e-bikes, scooters, solar garden lights
• Pull out propane cylinders and aerosols, including "empty" ones
• Set electronics aside for proper recycling
• Check whether an air conditioning unit is refrigerated or evaporative — they are handled differently
• Cut palm fronds and green waste down before loading; it routinely halves the volume
• Wear proper gloves and long sleeves for cactus and agave
• Separate the scrap metal; on acreage work, all of it
• Keep roof tile, concrete and soil out of the main container
• Load flat and heavy first, bulky on top, and stop at the rail
• In summer, do the sorting early in the morning