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Visual explainer / public works
Medfield is under Tier 3 water restrictions. This is the system behind the rule — from rain to aquifer to tap — and where the constraint actually lives. Scroll to follow the water.
Facts drawn from the Town of Medfield’s posted water conservation restrictions, annual water quality reporting, and town bylaw. Nonpartisan, like everything on our public-works desk.
Step one / the source
Medfield's water is groundwater. Rain and snowmelt soak into two aquifers — the Charles River aquifer and the Neponset River aquifer — natural underground reservoirs that recharge slowly, season over season. The town's Aquifer Protection District exists to keep that recharge clean.
Step two / the wells
Five active wells pull from those aquifers: wells 1, 2 and 6 from the Charles side, wells 3 and 4 from the Neponset side. A sixth well was abandoned when tests found high iron and manganese. However hard it rains, the system can only produce what these wells and one treatment plant can safely pump and treat in a day.
Step three / the system
From the treatment plant, water climbs into two storage tanks and travels roughly 80 miles of water main to reach every tap in town. Storage buys the system hours, not weeks — the tanks smooth out a day's peaks, they don't stockpile a summer.
Step four / the squeeze
In summer, lawn irrigation can multiply a town's water demand — right when aquifer recharge is at its lowest. When daily demand runs at the ceiling of what the wells and plant can produce, the margin for fire protection and system pressure thins. That is the actual constraint behind the rules.
Step five / the rules
Town bylaw requires a conservation state every summer, escalating by tier. Right now Medfield is at Tier 3: outdoor watering one day a week — even-numbered addresses on Mondays, odd on Thursdays, and only between 5pm and 9am — with irrigation systems prohibited. It is a demand valve, closed until the system catches up.
Step six / the way out
Long-term relief is engineering and budgeting: replacement and new source wells, treatment capacity, leak detection on aging mains (sensors now find leaks no human hears), storage, and honest conservation. Those decisions happen in capital plans and town meetings — which is exactly where residents come in.
Do something with this
The restrictions are the symptom; the capital plan is the story. Back the resident report asking Medfield for its long-term supply plan, or report what you’re seeing in your own town.
Sources: Town of Medfield Water Conservation Restrictions and Water & Sewer Division pages (town.medfield.net); Town of Medfield annual water quality report (wells and system inventory); Town of Medfield general bylaws, Water Conservation article (ecode360.com). Restrictions change — always confirm current rules with the town.