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National Clean Diesel Campaign (NCDC)
Please select from the topics below to submit your request. Depending on the complexity of your inquiry, we will respond within 3-5 business days for resolution of your issue.
If you have an immediate need, such as a grant application or project report deadline, please contact the NCDC helpline at 1-877-623-2322.
Please provide a description of your user account problem and we will get back to you within 3-5 business days
In the meantime, you can continue using the DEQ without logging in. If possible, download the Results Detailed Summary which lists your inputs and you will be able to replicate your results once your log in problem is resolved.
DEQ login E-mail (if different from E-mail entered above)
Please Explain Your Problem:
DEQ errors can be caused by high traffic volume or a number of other factors.
To help us resolve this issue, please provide the text of the error message (copy and paste) as well as the inputs listed below. Some errors will take time to replicate and may not be easily resolved. Please allow 5 business days for resolution of your issue.
As a workaround, try a different browser and/or not logging in. You can also try using the DEQ during non-peak hours (early in the morning, late in the evening, or on weekends/holidays).
Error Text: if available
All fields below are optional, however, we ask that you please fill out as many fields that apply to your calculation/question as possible. The more details and accuracy you provide, the easier it will be for us to pin-point the issue and find a solution.
Optional inputs to calculate cost effectiveness (EPA $, Other Federal $, CMAQ $, Local $, etc.)
Number of vehicles in the fleet
Class of equipment:
Engine model year for vehicles in group
Year in which the reduction technology will be installed
Currently used by the vehicle group
Annual miles per vehicle
Annual idle hours per vehicle
Annual engine hours per vehicle
Engine horsepower rating
Ferry / Excursion
Tugboat / Towboat
Commercial Charter Fishing
Crew and Supply
Liters per cylinder
Emissions Control Devices
Engine Replacement / Repower
Advanced Lubricant Technology Strategies
Engine and Truck Upgrades
Speed Management Policy
Idling Control Strategies
Number of vehicles to which you would like this technology applied
Idling hours reduced per vehicle (if applicable)
New model year of replaced vehicle/engine (if applicable)
User-input emission reduction percents for the pollutants (if applicable)
Unit and install cost in dollars per vehicle (if applicable)
Health benefits states, counties and percentages: (if applicable)
State & County:
State & County:
If you are having DEQ inputs or calculation problems, please review:
The DEQ Overview and Input Checklist pages describe what the DEQ can and cannot do. The DEQ FAQs document lists user questions that have been answered in the past including an extensive Table of Contents. Users who have reviewed these documents generally get more accurate and meaningful results.
To help us resolve this issue:
Some issues will take time to replicate and may not be easily resolved. Please allow 5 business days for resolution of your issue.
DEQ login Email (if different from Email entered above)
Describe your calculation problem and be as specific as possible:
All fields below are optional, however, we ask that you please fill out as many fields that apply to your calculation/question as possible. The more details and accuracy you provide, the easier it will be for us to pin-point the issue and find a solution
For questions about a specific emission factor or DEQ result:
This process will take time and may not result in a suitable answer or solution. All models have limitations, including those approved by the EPA.
Describe what you believe to be wrong and why. Please cite any outside sources which you are using for comparison.
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