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Council weighs costs and redundancy as Lakeville studies water treatment expansion
Summary
Staff and consultant presented three options to meet projected capacity (about 33 MGD): expand the existing plant ($22–26M), build a satellite plant with greater redundancy and PFAS flexibility ($37–42M), or a lower‑cost bypass option ($14–16M) that would reduce water quality; council favored further analysis with attention to financing and redundancy.
City staff and consultant Bill Johnson of Black and Beach presented an updated study on Lakeville’s water treatment capacity needs at the April 6 work session, saying the system—originally 10 MGD in 1998, later expanded and rerated to 26.5 MGD—is projected to need roughly 33 MGD at full buildout.
The study outlined three alternatives: (1) expand the existing water treatment plant by adding two filters, increasing pump capacity and building a 1.5 million‑gallon reservoir (estimated $22–26 million); (2) construct a satellite plant at a different site to add redundancy and simplify future PFAS treatment (estimated $37–42 million); or (3) adopt a max‑day bypass approach with limited treatment upgrades (estimated $14–16 million), which staff said would likely reduce summer water quality.
Council members discussed tradeoffs. Supporters of a satellite plant cited redundancy—protecting the city against a catastrophic single‑site outage, natural disaster, or cyber incident—and easier space for potential PFAS polishing treatment. Supporters of expanding the existing plant pointed to lower up‑front costs and existing planning to accommodate at least one expansion on the current campus. Staff estimated rate impacts: roughly a 2% increase (expansion) or about 5% (satellite) in 2027–28 under one financing scenario.
Council directed staff to continue refining cost, timing and financing scenarios and to return with rate‑impact options so the council can balance affordability with system resilience. No formal commitment to a specific alternative was made at the meeting.
