| 716 | REYNOLDS, INC. | 4520 N STATE ROAD 37 | ORLEANS | IN | 47452 | 812-865-3232 |
| 665 | CONTRACT DEWATERING SERVICES, I | 5820 W RIVERSIDE DRIVE | SARANAC | MI | 48881-0001 | 616-642-9415 |
| 794 | KELLEY DEWATERIING & CONSTRUCTION | 5175 CLAY AVE SW | WYOMING | MI | 49548 | 616-538-8010 |
| 709 | BRESNAHAN WELL DRILLING, INC. | 5293 HIGHWAY 175 | BATTLE CREEK | IA | 51006 | 712-365-4779 |
| 270 | ALTON WELL & CONCRETE OF ALLIANCE CONCRETE, INC. | 206 KANSAS AVE SW | ORANGE CITY | IA | 51041 | 712-756-8818 |
| 700 | LEUTHOLD PLUMBING, HEATING & ELECTRIC | 207 CLINTON ST | LESTER | IA | 51242-0070 | 712-478-4646 |
| 780 | GATOR BROTHERS, INC. | 728 PAR LANE | ROCK VALLEY | IA | 51247 | 712-470-1741 |
| 785 | MID-AMERICA DRILLING CORP | | OAKLAND | IA | 51560 | 712-482-6911 |
| 717 | MIDWEST THERMAL DRILLING, LLC. | 1802 CEDAR ROAD | PANAMA | IA | 51562-6007 | 712-489-2206/c 579-1642 |
| 738 | GINGERICH WELL & PUMP SERVICE, LLC | 1331 HWY 1 | KALONA | IA | 52247 | 319-656-2664 |
| 513 | LAYNE CHRISTENSEN CO | W229 N5005 DUPLAINVILLE RD | PEWAUKEE | WI | 53072 | 262-246-4646 |
| 770 | D.M.B. DRILLING CO., INC. | N 3308 STARKEY LAKE RD | SHELL LAKE | WI | 54871 | 715-653-4202 |
| 795 | GRIDOR CONSTRUCTION INC | 3990 27TH ST SE | BUFFALO | MN | 55313 | 763-746-9070 |
| 768 | E H RENNER & SONS INC | | ELK RIVER | MN | 55330 | 763-427-6100 |
| 766 | MINERAL SERVICES PLUS LLC | | GREEN ISLE | MN | 55338-2067 | 320-238-0195 |
| 670 | MOBILE ENVIRONMENTAL SAMPLING & ANALYSIS | 23007 BASELINE BLVD | JORDAN | MN | 55352 | 952- 297-2063 |
| 736 | DEDICATED GEOTHERMAL, LLC | 6450 PIONEER TRL | LORETTO | MN | 55357 | 763-432-4016 |
| 753 | T L STEVENS WELL COMPANY, INC. | 6250 HIGHWAY 12 WEST | MAPLE PLAIN | MN | 55359 | 763-479-2272 |
| 597 | BERGERSON-CASWELL, INC. | 5115 INDUSTRIAL ST | MAPLE PLAIN | MN | 55359-8610 | 763-479-3121 |
| 581 | NORTHERN DEWATERING, INC. | 14405 NORTHDALE BLVD | ROGERS | MN | 55374-9610 | 763-428-2616 |
| 663 | BRAUN INTERTECH CORP. | 11001 HAMPSHIRE AVE S | BLOOMINGTON | MN | 55438-2424 | 952-995-2308 |
| 615 | AECOM SUBSURFACE TESTING SERVICES, LTD. C/O AECOM | 161 CHESHIRE LANE NORTH SUITE 500 | PLYMOUTH | MN | 55441 | 763-852-4231 |
| 463 | STEFFL DRILLING & PUMP, INC. | 2295 66TH AVE NE | WILLMAR | MN | 56201-9183 | 320-235-8484 |
| 475 | THEIN WELL COMPANY, INC. | 11355 HWY 71 NE | SPICER | MN | 56222-0778 | 320-243-3344 |
| 787 | MIDWESTERN DRILLING | 1260 20TH STREET NW | HOLLOWAY | MN | 56249 | 320-394-2357 |
| 769 | WEST CENTRAL ENVIRO CONSULTANTS | 14 GREEN RIVER ROAD | MORRIS | MN | 56267 | 320-589-2039 |
| 792 | GLACIAL RIDGE DRILLING INC | 24985 5TH STREET NW | NEW LONDON | MN | 56273 | 320-354-1835 |
| 684 | ERVIN WELL COMPANY | 1312 WEST DEPUE AVE | OLIVIA | MN | 56277 | 320-523-1621 |
| 602 | REINART BROS. WELL DRILLING | 602 HWY 75 S | WHEATON | MN | 56296 | 320-563-8386 |
| 650 | KLIMEK BROS. WELL DRILLING, INC. | 702 1/2 COUNTY RD. 22 NW | ALEXANDRIA | MN | 56308-4955 | 320-762-8669 |
| 365 | STEVEN M. TRAUT WELLS, INC. | 754 CROSS COUNTRY LN SW | ALEXANDRIA | MN | 56308-6030 | 320-762-1528 |
| 63 | LEE WELL DRILLING INC. | 102 DAKOTA | HOFFMAN | MN | 56339-0143 | 320-986-2356 |
| 765 | BOART LONGYEAR CO. | 209 LE MIEUR STREET | LITTLE FALLS | MN | 56345 | 320-632-6532/800-422-6552 |
| 789 | MAJOR DRILLING | 14950 IRIS ROAD | LITTLE FALLS | MN | 56345 | 320-632-3010 |
| 610 | JENNINGS WELL DRILLING, INC. | 18938 STATE HIGHWAY 23 | RICHMOND | MN | 56368-0009 | 320-597-2482 |
| 751 | NASH DRILLING LLC | 34762 BIG MCDONALD LN | DENT | MN | 56528 | 320-412-6620 |
| 686 | GEOTECH OF MINNESOTA INC | 44362 454th AVE | PERHAM | MN | 56573 | 218-346-3250 |
| 791 | EKERN HOME EQUIPMENT CO INC | 815 2ND ST S | BROOKINGS | SD | 57006 | 605-692-4711 |
| 111 | LACEY WELL DRILLING | 47582 240th ST | DELL RAPIDS | SD | 57022-6113 | 428-5979 |
| 680 | MCLAURY ENGINEERING INC | 118 W MAIN ST | ELK POINT | SD | 57025-1130 | 605-356-2308 |
| 570 | BONDESEN IRRIGATION EQUIPMENT | 28468 SD HWY 19 | HURLEY | SD | 57036-6003 | 605-238-5482 |
| 478 | REINERS WELL DRILLING | 45805 281ST ST | HURLEY | SD | 57036-6012 | 605-238-5320 |
| 728 | SHUMAKER WELLS & REPAIR | 28208 467TH AVE | LENNOX | SD | 57039-5641 | 605-647-4395 |
| 515 | MARION WELL DRILLING | 27722 446TH AVE | MARION | SD | 57043-5418 | 925-4717 |
| 21 | KORANDA WELL COMPANY, LLC | 42719 307TH ST | TABOR | SD | 57063-2020 | 605-463-2244 |
| 796 | T & J REDDER WELL & ELECTRIC INC | 23949 476TH AVE | TRENT | SD | 57065 | 605-428-0108 |
| 666 | HAMMOND-WETMORE DRILLING | 27 N YALE ST | VERMILLION | SD | 57069 | 605-670-2321 |
| 775 | LONGSTEM GEOTHERMAL DRILLING | 1501 E MAIN ST | VERMILLION | SD | 57069 | 605-624-4754 |
| 640 | DENR - GEOLOGICAL SURVEY PROGRAM | USD - AKELEY SCIENCE CTR, 414 E. CLARK ST. | VERMILLION | SD | 57069-2307 | 677-5227 |
| 773 | QUALITY WELL SERVICE | 901 MULBERRY ST #1 | YANKTON | SD | 57078 | 402-841-0535 |
| 617 | AMERICAN TECH. SERVICES, INC. | 2301 E RICE ST | SIOUX FALLS | SD | 57103 | 605-339-3722 |
| 552 | GEOTEK ENGINEERING & TESTING SE | 909 E 50TH STREET N | SIOUX FALLS | SD | 57104 | 605-335-5512 |
| 648 | LEGGETTE BRASHEARS & GRAHAM, INC. | 140 E HINKS LANE SUITE 126 | SIOUX FALLS | SD | 57104 | 605-334-6000 |
| 439 | DAVE PUTZKE WELL DRILLING, INC. | 1408 S DEERBERRY TRAIL | SIOUX FALLS | SD | 57106-3351 | 605-361-9333 |
| 296 | CHASE DRILLING | 25748 COTTONWOOD AVE | SIOUX FALLS | SD | 57107 | 605-543-5582 / 5583 |
| 4 | BULLIS BROS. WELL DRILLING | 1201 KAREN ST | WATERTOWN | SD | 57201-1151 | 605-886-4044 |
| 613 | SCOTT ENGINEERING COMPANY | 707 SOUTH MAPLE STREET | WATERTOWN | SD | 57201-1414 | 605-886-5725 |
| 653 | COTEAU ENVIRONMENTAL | 312 9TH AVE SE #C | WATERTOWN | SD | 57201-4856 | 605-886-4009 |
| 689 | KAISER WELL DRILLING | 45550 193RD ST | LAKE NORDEN | SD | 57248-6612 | 605-785-3813/ 881-5152 |
| 598 | KRANZ WELL & EXCAVATION | 14841 480TH AVE | MILBANK | SD | 57252-5944 | 432-6000 |
| 777 | M & S DRILLING INC | 47168 161ST STREET | STRANDBURG | SD | 57265 | 605-676-2499 |
| 672 | MILLBROOK INDUSTRIES | 41659 256th STREET | MITCHELL | SD | 57301 | 605-995-0241 |
| 704 | LEMKE DIGGING & GEOTHERMO DRILLING | 40374 259th STREET | MITCHELL | SD | 57301-5718 | 605-770-6467 (cell) |
| 786 | AFFORDABLE DRILLING | 24052 414TH AVE | ARTESIAN | SD | 57314 | 605-216-0860 |
| 42 | GROSZ DRILLING COMPANY | BOX 157 | DELMONT | SD | 57330-0157 | 779-2541/ 2801 |
| 722 | STRETCH'S WELL SERVICE, INC. | 39179 195TH STREET | HITCHCOCK | SD | 57348-0036 | 605-266-2128 |
| 599 | DAKOTA ENVIRONMENTAL, INC. | 1122 21ST SW | HURON | SD | 57350-0636 | 352-5610 |
| 213 | HUTMACHER DRILLING, INC. | 2700 E HWY 16 | OACOMA | SD | 57365 | 734-6631 |
| 257 | HICKEY WELL DRILLING | 410 2ND ST | OACOMA | SD | 57365-0032 | 605-734-6171/c730-2820 |
| 7 | CAIN DRILLING | 500 E 3RD ST NE | ST LAWRENCE | SD | 57373-2340 | 853-3455 |
| 440 | PULLMAN WELL DRILLING | 264 COMMERCIAL AVE. SE | WOLSEY | SD | 57384 | 605-883-4532 |
| 725 | HARV'S DRILLING, INC. | 321 COMMERCIAL AVE SW | WOLSEY | SD | 57384-2200 | 605-883-4275 (350-0044) |
| 209 | LENIUS WELL DRILLING | 701 ORANGE AVE | BRITTON | SD | 57430-5135 | 605-448-5234 |
| 288 | OLSON WELL DRILLING | 1310 N 6TH STREET | GROTON | SD | 57445-2191 | 605-397-8262 / 397-2740 |
| 234 | DAKOTA BORING COMPANY | 15144 328TH AVENUE | TOLSTOY | SD | 57475-0126 | 605-442-2569 |
| 575 | AMERICAN ENGINEERING TESTING, INC. | 3700 E SD HWY 34 | PIERRE | SD | 57501 | 224-9535 |
| 706 | MORRIS INC. | BOX 1162 | PIERRE | SD | 57501-1162 | 605-223-2585 |
| 642 | ADAIR DRILLING | | MARTIN | SD | 57551 | 605-685-2083 |
| 473 | BABBY WELL DRILLING | | MARTIN | SD | 57551 | 605-685-6951 |
| 681 | WILD GOOSE WELL DRILLING | 29361 216TH AVE | MARTIN | SD | 57551 | 605-685-1402/ 867-1341 |
| 742 | NATIVE PLAINS WELL DRILLING | 21823 OLD HIGHWAY 18 | MARTIN | SD | 57551-5905 | 605-685-5372 |
| 231 | GREGG'S DRILLING & EXCAVATING | 506 E 1ST ST | MOBRIDGE | SD | 57601-2702 | 845-3428 /c 848-1185 |
| 442 | PESICKA'S DRILLING | | DUPREE | SD | 57623-0211 | 605-365-5454 |
| 739 | RAPID DRILLING | 22478 BENNETT ROAD | RAPID CITY | SD | 57701 | 605-348-7169 |
| 783 | TETRA TECH INC | 420 E SAINT PATRICK ST # 110 | RAPID CITY | SD | 57701 | 605-348-5850 |
| 331 | TAYLOR DRILLING COMPANY | 2310 COMMERCE ROAD | RAPID CITY | SD | 57702 | 605-348-3600 |
| 195 | SAM BICE DRILLING | 3701 HOLLY COURT | RAPID CITY | SD | 57702 | 605-381-4331 |
| 788 | TERRACON | 2026 SAMCO ROAD STE 101 | RAPID CITY | SD | 57702 | 605-716-2924 |
| 541 | FMG INC | 3700 STURGIS RD | RAPID CITY | SD | 57702-0317 | 605-342-4105 |
| 705 | DAKOTA BICE DRILLING, LLC. | 3818 HAGEN COURT | RAPID CITY | SD | 57702-5013 | 605-348-3609 |
| 678 | AMERICAN ENGINEERING TESTING,INC. | 1745 SAMCO RD | RAPID CITY | SD | 57702-9336 | 605-388-0029 |
| 752 | GEO THERMAL DYNAMIC DRILLING | 3320 WILLOWBEND RD | RAPID CITY | SD | 57703 | 605-484-4783 |
| 511 | DENNIS V. JOHNSON DBA DBJ DRILLING LLC | | RAPID CITY | SD | 57709-0405 | 605-343-1540 |
| 714 | CLEARWATER CONSULTING & WATER MANAGEMENT | 7005 TIMBERLINE ROAD | BLACK HAWK | SD | 57718 | 605-787-5653 / C 484-7934 |
| 668 | CAMERON'S PUMP & DRILLING | PO BOX 19 | BLACK HAWK | SD | 57718-0019 | 787-6023 |
| 694 | ANTLER ENTERPRISES, INC. | 6111 OLD FOLSOM RD | BLACK HAWK | SD | 57718-0407 | 605-391-4620 |
| 363 | HOWE WELL DRILLING & EXCAVATING, INC. | | CUSTER | SD | 57730 | 605-673-4722 |
| 703 | HOWIE DRILLING | 15280 LOWER SPRING CREEK ROAD | HERMOSA | SD | 57744-6519 | 605-341-4988 |
| 324 | ALEXANDER DRILLING, INC. | 24172 S HIGHWAY 385 | HILL CITY | SD | 57745-0615 | 605-574-2331 |
| 171 | HAMM DRILLING | 12089 DEERFIELD RD | HILL CITY | SD | 57745-6508 | 574-2995 |
| 638 | AMAN DRILLING | 21734 OLD RIDGE ROAD | NEMO | SD | 57759-7625 | 578-1860 |
| 677 | BUZZ'S WELL DRILLING | 22782 161st Ave | NEW UNDERWOOD | SD | 57761 | 605-441-1968 |
| 450 | VICTOR J WANG DRILLING | 21388 STATE STREET | PIEDMONT | SD | 57769 | 605-347-1005 |
| 724 | J & M DRILLING | | PRINGLE | SD | 57773-0081 | 605-673-3176 |
| 93 | ELLINGSON DRILLING | 4 DOUBLE D DRIVE | SPEARFISH | SD | 57783 | 605-642-2418 |
| 197 | HEATON DRILLING | 3108 10TH AVENUE | SPEARFISH | SD | 57783-9775 | 644-0735/ 641-0719 |
| 568 | CIMARRON DRILLING, INC. | 9017 S RIDGE TRAIL | STURGIS | SD | 57785-2826 | 605-347-3071 |
| 528 | LAKO DRILLING | 325 COUNTY ROAD 34 | ARTHUR | ND | 58006 | 701-967-8333 |
| 727 | FALK DRILLING, INC. | 502 MAIN AVENUE NORTH | HANKINSON | ND | 58041-0069 | 701-242-7537 |
| 336 | FALK GROUNDSOURCE TECH. INC. | 502 N MAIN AVE UNIT 1 | HANKINSON | ND | 58041-0277 | 701-242-7252 |
| 480 | WIEBER WELL DRILLING | 134 WILEY AVE N | LIDGERWOOD | ND | 58053 | 701-538-4161 |
| 285 | MANIKOWSKI WELL DRILLING | 10020 COUNTY RD 19 | LIDGERWOOD | ND | 58053 | 701-538-4504 |
| 508 | WATER SMITH INC | 1740 E MAIN AVE | WEST FARGO | ND | 58078-2211 | 701-282-3856 |
| 690 | DAKOTA TECHNOLOGIES, INC. | 2201-A 12TH ST N | FARGO | ND | 58102 | 701-237-4908 |
| 562 | MIDWEST TESTING LABORATORY, INC | 4102 7TH AVE N | FARGO | ND | 58108-3042 | 701-282-9633 |
| 652 | INTERSTATE DRILLING SERVICES | 1575 N 73RD STREET | GRAND FORKS | ND | 58203 | 701-738-8001 |
| 744 | RED RIVER DRILLING INC | 6215 HWY 18 | PISEK | ND | 58273 | 701-360-2270 |
| 687 | NORTH DAKOTA ENVIRO DRILLING, INC. | 201 EMMERLING AVE. | WAHALLA | ND | 58282-0620 | 1-877-739-4750 |
| 434 | M & W DRILLING | 1316 N 14TH ST | OAKES | ND | 58474 | 701-742-2429 |
| 793 | GENERAL IRRIGATION INC | | Oakes | ND | 58474 | 701-742-3223 |
| 776 | WESTERN DRILLING INC | 3566 110TH AVE NE | BISMARK | ND | 58502 | 701-471-7890 |
| 646 | EARTH ENERGY & WATER SYSTEMS | 3890 JUDSON STREET | NEW SALEM | ND | 58563-4802 | 701-843-8479 |
| 465 | BOB'S DRILLING & EXCAVATING | 206 2ND AVE | ZEELAND | ND | 58581-0006 | 701-423-5622 |
| 643 | GREGORY WATER & ENERGY INC. | 3484 114 U AVE. SW | DICKINSON | ND | 58601-8263 | 701-225-1796 |
| 112 | KNUTSON WELL DRILLING, INC. | 201 E HWY 12 | HETTINGER | ND | 58639-0587 | 701-567-4126 |
| 507 | TYSVER WELL DRILLING, LLC | 505 6TH AVE N | SCRANTON | ND | 58653 | 701-275-6222 |
| 732 | R & P INSULATION, INC. | 1201 46TH AVENUE NE | MINOT | ND | 58703 | 701-721-4566 |
| 664 | BERTRAM DRILLING, INC. | 510 KLENCK LANE | BILLINGS | MT | 59101-2053 | 406-259-2532 |
| 757 | TERRACON CONSULTANTS INC. | 2110 OVERLAND AVE STE124 | BILLINGS | MT | 59102 | 406-656-3072 |
| 784 | ADAIR DRILLING | 334 N MAIN STREET | PLENTYWOOD | MT | 59254 | 406-765-2256 |
| 693 | THERMAL DRILL INC. | 12758 COUNTY ROAD 350 | SIDNEY | MT | 59270 | 406-798-3363 |
| 601 | SHARP DRILLING, iINC. | 601 8TH AVE SE | SIDNEY | MT | 59270-5148 | 406-482-5620 |
| 723 | BELOW GROUND SURFACE INC. | 1126 E 1823 RD | LAWRENCE | KS | 660446 | 785-865-2655 |
| 748 | ENVIRONMENTAL PRIORITY SERVICE, INC. | 7193 E BENFIELD RD | SALINA | KS | 67401 | 785-823-6205 |
| 797 | O'MALLEY DRILLING INC | 1987 KELLIE DR | BLAIR | NE | 68008 | 402-426-5791 |
| 559 | GRIFFIN DEWATERING NC, LLC. | 6414 S 84TH ST | OMAHA | NE | 68127 | 402-331-5000 |
| 661 | THIELE GEOTECH, INC. | 13478 CHANDLER ROAD | OMAHA | NE | 68138-6174 | 402-556-2171 |
| 548 | TERRACON CONSULTANTS INC | 15080 A CIRCLE | OMAHA | NE | 68144-550 | 402-330-2202 |
| 577 | DIETZ WELL & PUMP COMPANY | | NORFOLK | NE | 68702-1263 | 402-371-1191 |
| 586 | SIOUXLAND WELL COMPANY INC. | 1004 ITHACA WAY | DAKOTA CITY | NE | 68731 | 402-632-4405 |
| 444 | CHRISTENSEN WELL & IRRIGATION, | 88005 HWY 57 | HARTINGTON | NE | 68739-4038 | 402-254-6809 |
| 273 | CHARLES SARGENT IRRIGATION COMPANY, INC | 84797 HIGHWAY 14 | NELIGH | NE | 68756-0009 | 402-887-4112 |
| 189 | GROSCH IRRIGATION CO., INC. | 119 N 4TH STREET | ONEILL | NE | 68763-1504 | 402-336-1438 |
| 667 | DAKOTA DRILLING & BACKHOE, INC. | 507 142ND ST | SOUTH SIOUX CITY | NE | 68776-4500 | 402-494-5208 |
| 763 | SALMON WELL COMPANY | 307 OAK STREET | WAKEFIELD | NE | 68784 | 402-287-2236 |
| 778 | GEOTECHNICAL SERVICES, INC (GSI) | 2960 NORTH DIERS AVE | GRAND ISLAND | NE | 68803-1243 | 308-381-1987 |
| 790 | DOWNEY DRILLING INC | 402 N GRANT ST | LEXINGTON | NE | 68850 | 308-324-2303/C-325-9890 |
| 782 | TWIN RIVERS TESTING & ENVIRONMENTAL LLC | 602 E WALKER RD | NORTH PLATTE | NE | 69101 | 308-534-5131 |
| 546 | BILL FREW DRILLING | 90398 NORDEN AVE | VALENTINE | NE | 69201 | 402-376-2149 |
| 108 | REIMERS WELL DRILLING | | VALENTINE | NE | 69201-0004 | 402-376-3707 |
| 377 | BECK'S WELL & IRRIGATION, INC. | 355 N CEDAR | AINSWORTH | NE | 69210 | 402-387-2052 |
| 427 | FORSTER WELL DRILLING | 5959 STATE HIWAY 27 | GORDON | NE | 69343-5030 | 308-282-0267 |
| 582 | GEOENGINEERS INC | 11955 LAKELAND PARK BLVD #100 | BATON ROUGE | LA | 70809-4217 | 225-293-2460 |
| 740 | BRECHTEL & SONS DRILLING | 13270 NORTHCLIFF CT | ELBERT | CO | 80106 | 719-648-8421 |
| 771 | ROCKY MOUNTAIN GEO-DRILLING, INC. | 14250 E EASTER PLACE #B | CENTENNIAL | CO | 80112 | 303-841-8858 |
| 718 | VISTA GEOSCIENCE LLC | 130 CAPITAL DRIVE #C | GOLDEN | CO | 80401 | 303-277-1694 |
| 774 | HYDRO RESOURCES - ROCKY MOUNTAIN, INC | 13027 COUNTY ROAD | FORT LUPTON | CO | 80621 | 303-857-7540 |
| 745 | DAVIS DRILLING, INC. | PO BOX 2302 | GILLETTE | WY | 82717 | 307-682-5950 |
| 747 | TRINITY EXPLORATION LLP | 207 S OSBORNE AVE | GILLETTE | WY | 82717 | 307-682-1153 |
| 698 | WATER SYSTEM DRILLING, INC. | | GILLETTE | WY | 82717-0368 | 307-686-1747 |
| 205 | TYVO, LLC | | UPTON | WY | 82730 | 307-468-2466 |
| 604 | WESTON ENGINEERING, INC. | 1401 HWY 16 EAST | UPTON | WY | 82730-0260 | 307-468-2427 |
| 532 | GREGORY DRILLING, INC. | 17609 NE 70TH STREET | REDMOND | WA | 98052-4915 | 425-869-2372 |
