Complete list of State Agencies for Private Water Well Driller Licensing/Registration:
https://www.ngwa.org/connect-with-your-state/State-Resources
Alabama
http://adem.alabama.gov/programs/water/waterforms.cnt
Alaska
https://www.commerce.alaska.gov/web/
Arizona
https://new.azwater.gov/permitting-wells#Well_Drillers/Licensing
Arkansas
California
http://cslb.ca.gov/about_us/contact_cslb.aspx
Colorado
http://water.state.co.us/groundwater/BOE/Pages/default.aspx
Connecticut
https://portal.ct.gov/DCP/License-Services-Division/All-License-Applications/Well-Drilling
Delaware
https://dnrec.alpha.delaware.gov/water/supply/water-well-licensing-board/
Florida
https://floridadep.gov/Water/Certification-Restoration
Georgia
https://epd.georgia.gov/water-well-standards-act-forms
Hawaii
http://cca.hawaii.gov/pvl/boards/contractor
Idaho
https://idwr.idaho.gov/wells/driller-licensing.html
Illinois
http://dph.illinois.gov/topics-services/environmental-health-protection/private-water
Indiana
https://www.in.gov/dnr/water/3651.htm
Iowa
http://www.iowadnr.gov/Environmental-Protection/Water-Quality/Private-Well-Program
Kansas
http://www.kdheks.gov/waterwell/
Kentucky
http://water.ky.gov/groundwater/Pages/WellDrillersProgram.aspx
Louisiana
http://www.dnr.louisiana.gov/index.cfm?md=pagebuilder&tmp=home&pid=1217
Maine
https://www.maine.gov/dhhs/mecdc/environmental-health/dwp/professionals/wellDrillers.shtml
Maryland
Massachusetts
https://www.mass.gov/well-driller-program
Michigan
https://www.michigan.gov/deq/0,1607,7-135-3313_3675_3694---,00.html
Minnesota
https://www.health.state.mn.us/communities/environment/water/wells/lwcinfo/training.html
Mississippi
https://www.mdeq.ms.gov/permits/water-well-drillers/
Missouri
https://dnr.mo.gov/commissions-boards-councils/well-installation-board
Montana
http://dnrc.mt.gov/divisions/water/operations/board-of-water-well-contractors
Nebraska
http://dhhs.ne.gov/licensure/Pages/Well-Drillers.aspx
Nevada
http://www.water.nv.gov/WellDrillersLicensing.aspx
New Hampshire
https://www.des.nh.gov/organization/divisions/water/dwgb/wwb/index.htm
New Jersey
https://www.state.nj.us/dep/watersupply/g_boards_le.html
New Mexico
https://www.ose.state.nm.us/Statewide/driller.php
New York
http://www.dec.ny.gov/lands/4997.html
North Carolina
http://portal.ncdenr.org/web/eh/wcc
North Dakota
http://bwwc.nd.gov/well_contractors.html
Ohio
http://www.odh.ohio.gov/odhprograms/eh/water/pwstypes/wells.aspx
Oklahoma
http://www.owrb.ok.gov/welldrilling/index.php
Oregon
https://www.oregon.gov/OWRD/PROGRAMS/GWWL/Pages/default.aspx
Pennsylvania
https://www.dcnr.pa.gov/Conservation/Water/Groundwater/Pages/default.aspx
Rhode Island
http://www.crb.ri.gov/welldrillers/index.php
South Carolina
https://llr.sc.gov/env/pub.aspx
South Dakota
https://danr.sd.gov/OfficeOfWater/WaterRights/Wells/WellDrillerLicensing.aspx
Tennessee
https://www.tn.gov/environment/permit-permits/water-permits1/well-driller-or-installer-license.html
Texas
https://www.tdlr.texas.gov/wwd/wwd.htm
Utah
https://www.waterrights.utah.gov/wellinfo/default.asp
Vermont
https://dec.vermont.gov/water/groundwater/well-drillers
Virginia
http://www.dpor.virginia.gov/Boards/WWWOOSSP/
Washington
https://ecology.wa.gov/water-shorelines/water-supply/wells
West Virginia
http://www.wvdhhr.org/phs/water/index.asp
Wisconsin
https://dnr.wi.gov/topic/Wells/licenses.html
Wyoming