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MMSD says Germantown is outside its flood‑management boundary but the watershed still matters
Summary
Milwaukee Metropolitan Sewerage District officials told Germantown’s Public Works committee that the agency is mandated to convey wastewater and that its flood‑management authority stops at the Milwaukee County line; MMSD will still account for upstream land use when designing downstream projects.
Mike Martin of the Milwaukee Metropolitan Sewerage District told the Germantown Public Works and Highway Committee that MMSD is a state‑chartered regional agency whose required role is wastewater conveyance and treatment, and that its legal flood‑management jurisdiction stops at the Milwaukee County line. He said Germantown lies outside MMSD’s legal boundary but inside the district’s sewer planning and service areas, so MMSD cannot perform flood‑management work inside Germantown by default.
Martin said MMSD’s top operational priorities during wet weather are preventing basement backups tied to the MMSD conveyance system, preventing sanitary sewer overflows (which are not permitted), and then managing combined sewer overflows within permit limits. "We are mandated to do wastewater conveyance," Martin said, emphasizing that flood management is discretionary and subject to statutory and jurisdictional constraints. He added that MMSD takes upstream watershed conditions into account when designing downstream flood‑management projects even when the impacted community lies outside MMSD’s legal boundary.
Committee members asked whether structures such as outlet control works or local ditch modifications could be changed to improve drainage. Martin said municipalities must obtain MMSD permission to increase pipe sizes that discharge to MMSD jurisdictional waterways because such changes can affect downstream flows and require hydraulic analysis. He also noted that work in FEMA‑mapped streams triggers additional state and federal requirements.
The committee heard that MMSD maintains separate requirements municipalities must adopt to manage stormwater and limit increases to runoff from new development; local governments retain ownership and maintenance responsibility for municipal sewers. The presentation clarified the limits of MMSD’s authority and set expectations about what the district can and cannot do during extreme short‑duration events.
