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S&B Division - Numbers of People Holding Credentials

October 27, 2009 - 80,535 credentials in 73 categories for 68,770 individuals
June 25, 2009 -  75,851 credentials in 71 categories for 65,446 individuals
May 18, 2009 - 74,079 credentials in 71 categories for 63,930 individuals
March 25, 2009 - 71,838 credentials in 67 categories for 61,897 individuals
August 15, 2008 - 69,105 credentials in 58 categories for 59,589 individuals
March 6, 2008 - 66,392 credentials in 57 categories for 56,916 individuals
September 6, 2007 -  64,949 credentials in 57 categories for 58,810 individuals  
December 13, 2006 - 56,186 credentials in 56 categories for 47,980 individuals

Download a 2-page PDF file of historical data from March 27, 2006, to June 25, 2009, on credential holder numbers. For a PDF listing historical data from August 15, 2008 to December 30, 2003, click here.

Download this PDF form to order custom lists of mailing data for selected categories of credential holders (the fee for these lists is partially based on the number of credential holders, which can be figured out using the most current data on this page).

Credential Categories 10-26-09 6-25-09 5-18-09 3-25-09 8-15-08 3-06-08 9-06-07
Automatic Fire Sprinkler Contractor 95 92 92 93 87 89 82
Automatic Fire Sprinkler Contractor - Maintenance 928 26 26 26 22 26 24
Automatic Fire Sprinkler Fitter-Maintenance 117 110 110 110 98 92 84
Automatic Fire Sprinkler System Apprentice 189 219 225 233 241 258 268
Automatic Fire Sprinkler System Tester 95 89 86 85 82 76 75
Beginning Electrician 500 563 552 544 495 499 459
Boiler-Pressure Vessel Inspector 166 155 153 149 183 181 183
Building Contractor 6,843 2,857 1,414 431
Class 1 Blaster 79 84 82 89 97 98 96
Class 2 Blaster 140 147 148 148 164 163 149
Class 3 Blaster 37 38 39 39 40 37 29
Class 4 Blaster 10 10 10 12 14 14 14
Class 5 Blaster 170 168 171 165 179 174 169
Class 6 Blaster 108 109 113 114 121 118 115
Class 7 Blaster 20 18 18 19 20 19 19
Commercial Building Inspector 670 691 686 678 673 672 656
Commercial Electrical Inspector 632 650 647 637 600 598 584
Commercial Plumbing Inspector 449 458 457 453 434 493 487
Cross Connection Control Tester 1,658 1,630 1,591 1,542 1,485 1,440 1,421
Dwelling Contractor  9,791 9,687 9,773 10,021 10,029 10,310 10,274
Dwelling Contractor - Restricted 8 7 6 5 3 5 6
Dwelling Contractor Qualifier  10,312 11,559 11,330 10,902 10,405 7,401 7,336
Electrical Contractor 645 461 415 399 302 299 277
Electrical Contractor - Restricted 147 158 159 158 158 156 154
Elevator Apprentice 135 132 130 121 0
Elevator Apprentice - Restricted 1 1 1 1 0
Elevator Contractor 45 36 35 26 0
Elevator Helper 32 30 30 30 0
Elevator Inspector 52 51 51 51 47 47 40
Elevator Mechanic 630 567 546 529 8
Elevator Mechanic - Restricted 15 13 13 12 0
Fireworks Manufacturer 9 7 7 8 9 9 9
HVAC Contractor 3,672 3,747 3,808 3,938 4,104 4,013 3,898
HVAC Qualifier 347 351 350 348 348 335 321
Journeyman Automatic Fire Sprinkler Fitter 658 637 628 618 558 587 539
Journeyman Electrician 3,452 3,384 3,350 3,244 2,986 2,856 2,700
Journeyman Plumber 3,075 2,987 2,961 2,943 2,813 2,901 2,817
Journeyman Plumber - Restricted Appliance 349 340 335 329 316 328 319
Journeyman Plumber - Restricted Service 352 348 347 342 331 362 353
Lift Apprentice 0 0 0 0 0
Lift Helper 19 18 18 18 0
Lift Mechanic 33 30 30 26 0
Liquefied Gas Supplier 234 54 8
Liquefied Gas Supplier - Restricted 139 16 3
Manufactured Home Dealer 185 187 185
Manufactured Home Installer 352 350 348 341 330 315 308
Manufactured Home Manufacturer 17 17 17 17 25 24 25
Manufactured Home Salesperson 643 618 664
Master Electrician 4,258 4,220 4,191 4,155 4,043 3,887 3,776
Master Plumber 2,961 2,910 2,893 2,870 2,786 2,818 2,778
Master Plumber - Restricted Appliance 244 241 240 238 231 241 238
Master Plumber - Restricted Service 633 626 626 623 614 625 631
Pipelayer 905 871 862 853 802 910 888
Plumbing Apprentice 873 976 1,000 1,019 1,094 1,161 1,158
Plumbing Learner - Restricted Appliance 118 127 129 133 158 162 161
Plumbing Learner - Restricted Service 130 128 127 126 149 155 162
POWTS Inspector 493 522 525 518 507 509 501
POWTS Maintainer 714 714 721 762 849 818 805
Refrigerant Handling Technician 9548 9,588 9,599 9,664 9,905 9,640 9,461
Rental Weatherization Inspector 359 403 400 394 390 395 391
Soil Erosion Inspector 368 395 374 302 293 262 262
Soil Tester 963 1,030 1,034 1,030 1,017 1,006 1,002
UDC Inspection Agency 128 134 132 133 148 149 147
UDC-Construction Inspector 1,096 1,191 1,194 1,186 1,166 1,186 1,170
UDC-Electrical Inspector 820 868 866 859 845 849 838
UDC-HVAC Inspector 969 1,056 1,054 1,048 1,034 1,062 1,048
UDC-Plumbing Inspector 682 741 739 737 729 733 728
Utility Contractor 416 413 413 412 399 409 394
Weld Test Conductor - Physical 95 92 92 91 88 79 77
Weld Test Conductor - Radiographic 12 12 12 12 13 13 13
Welder 4,826 4,726 4,688 4,679 4,630 4,328 4,030

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Email this page's manager, Norma Sampson, norma.sampson@wisconsin.gov or 608-267-7907.

The Department of Commerce Safety and Buildings Division is an equal opportunity service provider and employer. If you need assistance to access services or need material in an alternate format please contact us 608-266-3151 TDD Relay dial 711 in Wisconsin or 800-947-3529 or norma.sampson@wisconsin.gov.