The North American Industry Classification System NAICS is a system for classifying industries by a six-digit code. [Wikipedia]
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TOP Description Asmts Reccs
back 221xxx Utilities 174 1,053
back 2213xx Water, Sewage and Other Systems 171 1,035
22132x Sewage Treatment Facilities 119 731
221320 Sewage Treatment Facilities 119 731
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