The North American Industry Classification System NAICS is a six-digit industrial classification system.
| ARC | 2+ Digits Required | |
| NAICS | 3+ Digits Required | |
| SIC | 2+ Digits Required | |
| 3+ Characters Required for Products | ||
Tracking of the NAICS for ITAC assessments begin in 2003.
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NAICS | Description | Assessments Assmt's | Recommendations Rec's | Potential Savings | ||
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221xxx | 221xxx: Utilities | 424 | 2,392 | $238k avg | ||
| selected | 2213xx | 2213xx: Water, Sewage and Other Systems | 420 | 2,370 | $234k avg | ||
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22131x | 22131x: Water Supply and Irrigation Systems | 125 | 654 | $127k avg | ||
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22132x | 22132x: Sewage Treatment Facilities | 288 | 1,683 | $284k avg | ||
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22133x | 22133x: Steam and Air-Conditioning Supply | 7 | 33 | $87k avg | ||