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Waukesha County WI — 287(g) Regional Leader (Dual-Model Agreement)

Waukesha, WI FIPS 55133

Current status: Waukesha County is a regional leader in Wisconsin's 287(g) spread, holding agreements under BOTH the Jail Enforcement and Warrant Service Officer models. Retiring Sheriff Eric Severson sought the authority early; all three 2026 sheriff candidates support continuing it. Waukesha is one of 19 of Wisconsin's 72 counties in 287(g) by early 2026 and sits at the center of ACLU opposition and the pending Wisconsin Supreme Court detainer case.

The Fight

Waukesha County — Wisconsin’s highest-heat county on the detention-pipeline map — is the state’s 287(g) standard-bearer. It holds agreements under both ICE models at once: the Jail Enforcement model (screening inmates for immigration status/deportation orders) and the Warrant Service Officer model (deputies executing ICE administrative warrants). Only Waukesha, Kewaunee, and Sauk carry the dual-model arrangement among Wisconsin’s 19 participating counties.

Key Details

Early adopter: retiring Sheriff Eric Severson sought 287(g) jail authority years ago, making Waukesha a regional model for screening jail inmates for ICE.
Statewide context: by late February 2026, 19 of 72 Wisconsin counties had joined 287(g) (most via Warrant Service Officer; Kenosha and Marathon via Jail Enforcement; new 2026 signers Dunn, Green Lake, Walworth; ACLU also flagged Washington and Winnebago).
2026 sheriff race: all three candidates to succeed Severson support continuing the 287(g) program.
Opposition: ACLU of Wisconsin tracks and condemns the agreements; Waukesha’s participation feeds the broader detainer dispute now before the state Supreme Court (see dodge-county-wi-ice-detainer-supreme-court).

Why It Matters

Waukesha demonstrates how a single early-adopter sheriff’s office can anchor a statewide diffusion of 287(g) authority, and the dual-model setup maximizes the county’s enforcement reach — both inside the jail and on the street. With every major sheriff candidate endorsing it, the program is politically entrenched regardless of the Supreme Court’s detainer ruling.

Sources

This research is published at The RAMM — investigative reporting on the detention pipeline.

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