| Municipality | State | Rate paid | Rate charged | Water provider |
| Beverly Shores | Indiana | $0 | $2.69 | Michigan City |
| Burns Harbor | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Cedar Lake - Crystal Oak | Indiana | $0 | $7.49 | Well |
| Cedar Lake - Robin's Nest | Indiana | $0 | $5.34 | Well |
| Cedar Lake - west side | Indiana | $0 | $9.01 | Well |
| Chesterton | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Crown Point | Indiana | $2.54 | $9.92 | Indiana American Water Co. |
| Dune Acres | Indiana | | | Indiana American Water Co. |
| Dyer | Indiana | $0.77 | $3.13 | Highland-Hammond |
| East Chicago | Indiana | $0 | $1.19 | Self |
| Gary | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Griffith | Indiana | $0.58 | $3.12 | Hammond |
| Hammond | Indiana | $0 | $0.46 | Self |
| Hebron | Indiana | $0 | $8.34 | Well |
| Highland | Indiana | $0.50 | $1.61 | Hammond |
| Hobart | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Kouts | Indiana | $0 | $6.84 | Well |
| Lake Station | Indiana | $2.54 | $3.94 | Indiana American Water Co. |
| Lowell | Indiana | $0 | $7.64 | Well |
| Merrillville - Remainder of town | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Merrillville - Lincoln Gardens and Young America and Southbrook neighborhoods | Indiana | | | Indiana Water Service Corp. |
| Munster | Indiana | $0.52 | $2.93 | Hammond |
| New Chicago | Indiana | $2.54 | $7.55 | Indiana American Water Co. |
| Ogden Dunes | Indiana | $2.54 | $5.03 | Indiana American Water Co. |
| Portage | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Porter | Indiana | $0 | $4.35 | Indiana American Water Co. |
| Schererville | Indiana | $2.54 | $4.78 | Indiana American Water Co. |
| Schneider | Indiana | $0 | $38.33 per household | Self |
| St. John | Indiana | $0 | $3.26 | Well |
| Valparaiso | Indiana | $0 | $3.13 | Well |
| Whiting | Indiana | $0.48 | $2.44 | Hammond |
| Winfield - Remainder of town | Indiana | | | Indiana American Water Co. |
| Winfield - The Point and The Meadows | Indiana | | | Twin Lakes Utilities |
| Burnham -- east side | Illinois | $2.88 | $3.25 | Chicago |
| Burnham -- west side | Illinois | $2.20 | $3.25 | Hammond |
| Calumet City | Illinois | $2.20 | | Hammond |
| Chicago | Illinois | $0 | $2.89 | Self |
| Chicago Heights | Illinois | $2.20 | $3.30 | Hammond |
| Crete | Illinois | $0 | $2.58 | Well |
| Dolton | Illinois | | $5.86 | Chicago |
| Ford Heights | Illinois | | | Chicago Heights |
| Glenwood | Illinois | $2.21 | $6.62* | Chicago Heights |
| Harvey | Illinois | $2.51 | $4.99 | Chicago |
| Homewood | Illinois | $2.96 | $8.24 | Harvey |
| Lansing | Illinois | $1.12 | $5 | Hammond |
| Lynwood | Illinois | $1.96 | $4.96 | Lansing-Hammond |
| Riverdale | Illinois | | $6.57 | Chicago |
| Sauk Village | Illinois | $0 | $5.50 | Well |
| South Holland | Illinois | $2.51 | $4.70 | Chicago |
| South Holland | Illinois | $1.90 | $4.70 | Lansing-Hammond |
| Steger | Illinois | $0 | $3.24 | Well |
| Thornton | Illinois | $0.58 | $5.34* | Chicago Heights |
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