The map shows where Cascade Utilities, I offers DSL internet service. When different max speeds are available at different addresses within a hex, color is determined by the fastest speed.
Colored hexagons indicate where Cascade Utilities, I services at least one address. Internet service is not necessarily available at every location within a colored hex.
Along with DSL, Cascade Utilities, I also offers fiber. See Cascade Utilities, I Fiber Availability.
Broadband Map's information on Cascade Utilities, I DSL availability relies heavily on the May 2026 release from the FCC's Broadband Data Collection program (representing ISPs' availability as of December 2025).