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Where Should a Sump Pump Drain?

Where discharge water can and cannot go in Lowell and nearby towns.

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Updated October 2026 · By Lowell Plumbing Pros · Rules linked to official sources

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Direct answer

A sump pump should discharge outside, at least several feet from the foundation, onto ground that slopes away from the house or to another approved location. It should not drain into the sanitary sewer, which Dracut and Tyngsborough prohibit, nor onto a neighbor’s property or across a sidewalk. Confirm Lowell’s rule for your property [VERIFY AGAINST OFFICIAL SOURCE].

Where it can and cannot go

Usually acceptable

  • Your own yard, well away from the foundation, sloping away from the house
  • A dry well or approved infiltration area
  • A storm drainage connection only where the community allows it [VERIFY AGAINST OFFICIAL SOURCE]

Not acceptable

  • The sanitary sewer (basement floor drain, laundry tub or sewer line)
  • A neighbor’s property
  • Across a public sidewalk or into the street where it can freeze
  • Right next to the foundation, where it cycles back in

Why sewer connections are prohibited

Groundwater pumped into the sanitary sewer takes up capacity meant for wastewater. During storms, thousands of sump pumps can overload sewer pipes and treatment plants, causing backups and overflows. That is why many communities ban the connection and can fine owners who make it.

Local rules we found

  • Dracut: town bylaws prohibit connecting sump pumps, roof drains or foundation drains to the sanitary sewer [VERIFY AGAINST OFFICIAL SOURCE]
  • Tyngsborough: the Sewer Commission prohibits sump pump discharge into the sewer, with penalties for violations [VERIFY AGAINST OFFICIAL SOURCE]
  • Lowell: confirm the current rule with the Lowell Regional Wastewater Utility [VERIFY AGAINST OFFICIAL SOURCE]

Official sources

Winter discharge tips

  • Keep the discharge line pitched so it drains and does not freeze
  • Make sure the outlet is not buried under snow
  • Consider a freeze-relief fitting so water can escape if the line ices up

Lowell-specific note

High water tables near the rivers

Basements near the Merrimack and Concord rivers and low-lying parts of Dracut, Billerica and Tyngsborough pump often in spring. Routing that water correctly matters, because a sewer connection can be cited and a discharge too close to the house keeps the pump running.

Get it routed right

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Related questions

No. The laundry sink drains to the sanitary sewer, which is the connection most communities prohibit.

Far enough that the water does not run back to the foundation, typically several feet or more onto ground sloping away. Your plumber will plan the route for your lot.

Have a plumber reroute it outside and cap the old connection. It is a common, straightforward fix.

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