| St. John's River Water Management District-SA |
611 |
| Earth Tech, Inc. |
452 |
| SRP Salt River Project |
374 |
| American Water Company, Inc. |
373 |
| Lower Colorado River Authority |
357 |
| Nalco Company |
354 |
| Kiewit Pacific |
340 |
| Los Angeles Department of Water and Power |
330 |
| Michael Baker Corporation |
313 |
| Pentair, Inc. |
287 |
| City of Anaheim |
211 |
| Covanta Energy Corporation |
191 |
| Veolia Water North America |
172 |
| United Water Resources |
162 |
| Board of Water Commissioners, City and County of Denver, Colorado |
148 |
| Aqua America, Inc. |
144 |
| East Bay Municipal Utility District |
138 |
| Orlando Utilities Commission |
128 |
| Severn Trent Water Ltd |
126 |
| Carollo Engineers, P.C. |
116 |
| San Francisco Public Utilities Commission |
116 |
| Gainesville Regional Utilities Inc. |
113 |
| Las Vegas Valley Water District |
111 |
| Imperial Irrigation District |
105 |
| Southwest Water Company |
102 |
| Chelan County Public Utility District |
100 |
| Washington Suburban Sanitation Commission |
92 |
| The O'Brien & Gere Companies |
88 |
| Severn Trent Services |
87 |
| GE Water and Process Technologies |
85 |
| California Water Service Company |
84 |
| American States Water Company |
84 |
| Yorkshire Water |
84 |
| Hancor Inc |
79 |
| Memphis Light, Gas and Water Division |
78 |
| Parametrix, Inc. |
77 |
| EMA Services Inc |
73 |
| Detroit Water and Sewage Department |
69 |
| Northumbrian Water Ltd. |
68 |
| Three Valleys Water PLC |
64 |
| American Water Works Association |
63 |
| Southern Water |
60 |
| Anglian Water Services Limited |
59 |
| Paulus Sokolowski & Sartor |
57 |
| County of Olmsted |
57 |
| Wolseley Mechanical |
56 |
| General Chemical Corporation |
56 |
| Freese and Nichols, Inc. |
54 |
| Heritage Environmental Services, LLC |
54 |
| Gundle/SLT Environmental, Inc. |
52 |
| Greeley and Hansen, |
52 |
| Telvent |
51 |
| The Metropolitan District |
51 |
| Golden State Water Company |
50 |
| Wessex Water |
50 |
| Fairfax Water |
47 |
| Henderson Water Utility, the |
47 |
| Aqua-Chem, Inc. |
45 |
| WaterOne |
43 |
| Lojic |
42 |
| Eaga Partnership Ltd |
41 |
| Padre Dam |
41 |
| Aquarion |
40 |
| Birmingham Water Works |
39 |
| Middlesex Water Company |
39 |
| south central CT regional water authority |
38 |
| Inland Empire Utilities Agency |
36 |
| Fuscoe Engineering |
35 |
| Cleveland, City of |
33 |
| Coachella Valley Water Dist |
33 |
| Provincial Government of the Western Cape |
33 |
| Bristol Water Holdings plc |
32 |
| Kelda Group plc |
32 |
| El Dorado Irrigation District |
31 |
| O&G Industries, Inc. |
31 |
| Central Arkansas Water |
31 |
| Lakehaven Utility District |
30 |
| Suffolk County Water Authority |
30 |
| Louisville Water Company |
30 |
| Thames Water |
30 |
| Pennsylvania American Water |
29 |
| Robinson, Waters |
28 |
| Florida Keys Aqueduct Authority (FKAA) |
28 |
| Clear Creek Associates |
26 |
| T and M Associates |
26 |
| South West Water Ltd |
26 |
| Damon S. Williams Associates, LLC |
25 |
| Northern Colorado Water Conservancy District |
25 |
| Southern Nevada Water Authority |
25 |
| Carthage Water & Electric |
25 |
| Clow Valve Company |
24 |
| GE Water & Process Technologies |
24 |
| Evergreen Energy Inc |
24 |
| Crane Environmental, Inc. |
24 |
| El Paso Water Utilities |
24 |
| National Ground Water Association |
24 |
| Hersey Meters |
24 |
| Myers Water Plant |
23 |
| BTL Industries |
23 |
| American Canyon Utility Water |
22 |
| MIOX Corporation |
22 |
| Severn Trent Plc |
22 |
| 2M Corp |
21 |
| UTILX Corporation |
21 |
| Alar Engineering Corporation |
21 |
| Western Summit Constructors, Inc. |
20 |
| Alcosan |
20 |
| Metro Wastewater Reclamation District |
20 |
| Wildermuth |
20 |
| Utility Pipe Sales |
20 |
| New Braunfels Utilities |
19 |
| Regenesis |
19 |
| Grand Strand Water |
19 |
| ENTACT LLC Environmental Services |
19 |
| BIWATER TREATMENT LIMITED |
19 |
| Pittsburgh Water & Sewer Authority |
19 |
| Koester Associaties |
19 |
| Etna Supply Company |
18 |
| Brick Township Municipal Utilities Authority |
18 |
| In-Situ |
18 |
| Providence Water Supply Board |
18 |
| South East Water |
18 |
| Passaic Valley Water Commission |
18 |
| MT LAUREL TWP MUNI UTIL AUT |
18 |
| Fairfax County Water Authority |
17 |
| Pacific Groundwater Group |
17 |
| Computer Express, Inc. |
17 |
| Krieger & Stewart, Incorporated |
17 |
| Southface Energy Institute |
17 |
| Guadalupe Blanco River Auth |
17 |
| Henry County Water Co |
17 |
| Spartanburg Water System |
17 |
| Infilco Degremont Inc. |
17 |
| InfrastruX Group, Inc. |
16 |
| Ecodyne Limited |
16 |
| Lewis County |
16 |
| CES International |
16 |
| Sydney Water |
16 |
| Avogadro Group |
16 |
| Hydro Quebec |
16 |
| Utility Equipment Company |
16 |
| Aquatera |
15 |
| Pueblo Water |
15 |
| Narragansett Bay Commission |
15 |
| Monroe County Water Authority |
15 |
| Essex |
15 |
| MECO Incorporated |
15 |
| Water Missions International |
14 |
| Solarbee, Inc. |
14 |
| Bridgewater HOME Inc |
13 |
| Pennon Group Plc |
13 |
| OKANOGAN COUNTY PUD |
13 |
| Green Bay Metropolitan |
13 |
| American Hydro Corp |
13 |
| Hci Publications |
13 |
| Prince William County Service Authority |
13 |
| Arizona Water Company |
13 |
| Minol |
13 |
| E.H. Wachs |
13 |
| Ashbrook Simon-Hartley |
12 |
| CO Water |
12 |
| Balleau Groundwater Inc |
12 |
| Santa Margarita Water District |
12 |
| Moulton Niguel Water District |
12 |
| Municipal Water Authority |
12 |
| The Astbury Group |
12 |
| Consolidated Utility District |
12 |
| Erie Water Works |
12 |
| AEC, Inc. |
12 |
| Erie County Water Auth |
12 |
| PBC Water Utilities Department |
12 |
| ESI Ltd |
12 |
| Eco-Tec Inc. |
11 |
| Bournemouth and West Hampshire Water |
11 |
| North Marin Water District |
11 |
| Ace Clearwater Enterprises |
11 |
| Brentwood Water Dept |
11 |
| Chester Water Authority |
11 |
| Lowell City Water Utilities |
11 |
| Edwards Aquifer Authority |
11 |
| Montgomery Water Works Board |
11 |
| South Coast Water District |
11 |
| ABS Pumps Inc |
11 |
| balance hydrologics |
11 |
| Crown Solutions Inc |
11 |
| Mountain Valley Spring Company, LLC |
11 |
| Utility Services of Alaska |
11 |
| Alameda Countywide Clean Water Program |
10 |
| Vista Irrigation District |
10 |
| Zone 7 Water Agency |
10 |
| Matcor Inc |
10 |
| Kitsap County PUD |
10 |
| Richard Water Treatment Plant |
10 |
| Green Empowerment |
10 |
| South Adams County Water |
10 |
| WaterHealth International Inc. |
10 |
| Somat Engineering Inc. |
10 |
| Kenning Inc |
10 |
| New Jersey Distrib. Water Sup. Co. |
10 |
| Sacramento Suburban Water District |
10 |
