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Pollution Prevention (P2)

By being "green", businesses save money and become more competitive.


EPA's Designed for Environment is a program that's partners with manufacturers.

Generator Assistance Program - FREE assistance in understanding hazardous wastes and other environmental regulation, call 1-888-568-1831 x3415

Database of State Incentives for Renewables & Efficiency- federal, state & local incentives

EcoCycle - view website of local recyclers for hard-to-recycle items and list of recyclers that serve businesses.

Reduce, Reuse, Recycle

Fluorescent Light Bulb Recycling

Regulatory Links

Link - Environmental Permits

Industrial Pretreatment Program

Stormwater Quality Program

Industry Specific P2 Info

Automotive Industry

Dental Industry

Dry Cleaning Industry


P2 Program

501 East 1st Avenue

Longmont, CO 80501

Phone (303) 651-8667

or email

Resource Conservation |Industrial Pretreatment Program|Wastewater Treatment |Public Works & Natural Resources|City of Longmont


P2 Tips for the Automotive Industry


Antifreeze Disposal

Commercial businesses cannot discharge antifreeze down the drain.

The State of Colorado's Hazardous Waste Division categorizes spent antifreeze according to the disposal option used. Spent antifreeze is a hazardous waste unless it is recycled.

Can spent antifreeze be flush down the drain? NO. The Municipal Code forbids the discharge of any hazardous wastes to the sewer. If you discharge hazardous wastes to the drain, you are required to report the discharge to the City of Longmont's Industrial Pretreatment Program, State of Colorado and EPA.

Can antifreeze be discharged to a storm drain? NO. Antifreeze is toxic. Storm drains lead directly to the St. Vrain River without treatment.

What is the proper disposal option? Spent antifreeze may be taken off-site for proper disposal by a hazardous waste hauler OR taken off-site for recycling OR recycled on site.

What recyclers are servicing the Longmont area? Download a brochure (pdf file, 98 KB) for a current list of recyclers and haulers.

Can't view pdf files? More information is available for installing Acrobat Reader.
Or call (303) 651-8667 for hardcopies.

BUSINESSES LISTED IN BROCHURES AS THOSE SERVICING THE LONGMONT AREA- Businesses listed in the above brochure are provided for your convenience. Inclusion or omission of any business listed in no way implies endorsement or rejection by the City of Longmont or the Industrial Pretreatment Program. Any business servicing Longmont for antifreeze disposal or recycling may call 303-651-8667 to be included in future printings.


Additional Hazardous Waste Information

The State of Colorado Department of Health and Environment offers more information about Hazardous Waste. Please visit their website at:

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Pollution Prevention For Dry Cleaners

In case of discharge reaching the sanitary sewer, immediately call the Industrial Pretreatment Program at (303) 651-8667.


State Requirements for Small and Large Quantity Hazardous Wastes Generators

Per the CDPHE Hazardous Waste Division's 2005 requirements, all Longmont dry cleaners using PERC must provide letters from the City stating that the City is aware of and approves of treatment and disposition of wastewater. Contact the IP Program at (303) 651-8667 to schedule an inspection to obtain this letter.


Nationally, 82% of Dry Cleaners use PERC (perchloroethylene). PERC is a hazardous material. Discharges of hazardous materials/wastes to the City's sanitary sewer is prohibited by the Municipal Code (Section 14.08.310). Discharges of PERC or PERC-containing wastewater to the sanitary sewer can seep into ground water or expose City sewer workers to hazardous environments. Long term discharges may result in requirements for expensive clean up operations when ground water or soil becomes contaminated.

In case of discharge reaching the sanitary sewer, immediately call the Industrial Pretreatment Program at (303) 651-8667.

PERC wastes, filters and still bottoms are required be taken offsite for hazardous waste disposal per RCRA requirements. Aqueous wastes containing PERC may be taken offsite for hazardous waste disposal or evaporated. Keep all manifests for hazardous wastes disposal on site and available for inspections for a minimum of 3 years.


Wastewater Discharge Permits - Zero Discharge Permits

  • The CDPHE requires all Small Quantity Generators (SQG) and Large Quantitiy Generators (LQG) of Hazardous Wastes to obtain a zero discharge permit from the City if any wastes are treated on site prior to any disposal. (If wastes are reused/recycled, they are not considered "hazardous wastes".)
  • The City's Municipal Code requires any business that holds wastes in any kind of tank prior to discharge to the sanitary sewer to obtain a discharge permit from the City.

The Municipal Code prohibits the discharge of any PERC or PERC-containing wastes to the sanitary sewer.


PERC is soluable in water. Per RCRA, any water coming into contact with PERC is also hazardous waste. Aqueous wastes are generated during the washing cycles (from humidity, spot cleaning or water added to machine to dissolve detergents) and from condensers.

Aqueous wastes may be evaporated or taken offsite for hazardous wastes disposal.

  • Do not flush aqueous wastes to the sanitary sewer or ground.

  • Do not flush aqueous wastes to boilers as these may flush to the sanitary sewer or ground during blow down. PERC will also cause corrosion of your boiler.

  • Do not use injection wells for aqueous waste disposal (ground water contamination potential).

Monitor the amounts of aqueous waste generated. An increase may indicate a leak.

PERC will cause corrosion of metal pipes or equipment. When PERC comes in contact with copper pipes, PERC or the PERC-containing wastewater will be colored blue indicating high copper contamination. Discharge of blue wastewater would most likely exceed the local limits for copper (Municipal Code 14.08.312) - another reason PERC-containing wastes (whether it's blue or not) cannot be discharged to the drain.

The best way to protect the sewer is to cap all floor drains so that accidental spills cannot enter.

Spill Response Plan

All Longmont Dry Cleaners that use PERC should have a Spill Response Plan to train employees in case of an accidental spill and/or entry into the sanitary sewer. The Plan should include:

  • chemical safety and storage (MSDS);

  • spill containment;

  • any special considerations for delivery of solvents and pick up of hazardous wastes;

  • spill cleanup - protecting the sewer, plugging floor drains;

  • emergency response - including emergency phone numbers for City; and

  • training of employees and documentation of training.

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CDPHE Website: Compliance Guidebook for Colorado Dry Cleaners


This page was updated August 16, 2013

City of Longmont Public Works & Natural Resources

Environmental Services

Pollution Prevention Program