The pump is fine. The pipe is frozen.
A sump discharge line that freezes does not stop the pump. It just takes away the only place the water was going, and the basement gets it instead. Here is where New Jersey lets that water go, and why the floor drain is the worst answer available.
A sump pump may not discharge into the sanitary sewer anywhere in New Jersey: the state's capacity assurance rules name disconnecting sump pumps and roof leaders from sanitary sewer lines as a required strategy. The standard answer is an absorbent surface, grass, mulch, rock or soil, far enough out that the water dissipates and does not run back to the foundation or onto the neighbour. A storm sewer, swale or basin is the usual fallback where that is not feasible, normally by permit. And a discharge that builds up icing, standing water or erosion on a street, sidewalk or right-of-way is a violation on its own, which is how a line that has run the same way for twenty years stops being grandfathered in one winter.
What to do right now
Check whether the line is frozen, not the pump
A pump that hums, runs constantly, or cycles every few seconds with the pit still full is usually pushing against a plug of ice somewhere in the discharge line. The pump is working. The water has nowhere to go and it comes back down the pipe.
Find where the line comes out
Walk the outside and find the end of it. A buried line that daylights into a snowbank, or a line that ends flush at grade where water can pond and freeze, is the usual culprit. The last few feet are where it freezes first, because that is the part with no ground heat around it.
Give the water a temporary way out
Until the line thaws, a hose off the pump discharge run somewhere well away from the foundation will keep the basement dry. Somewhere, specifically: not onto the sidewalk, not into the street, and not at the neighbour's foundation, all of which are their own problem.
Do not send it to the floor drain
It is the nearest hole and it is the one that gets people fined. A floor drain usually goes to the sanitary sewer, and putting clean groundwater there is prohibited. It is also how a basement takes on sewage in a heavy storm.
Then fix the reason it froze
A line that froze once will freeze every winter. The fix is depth, slope, diameter and where it ends, and that is outside work rather than a pump problem.
Where the water is allowed to go
Two layers apply. The sanitary sewer answer is statewide. Everything else is your town's ordinance, and they vary in wording rather than in intent. The worked example here is Franklin Township in Somerset County, which is inside our service area and whose ordinance is unusually complete, but check your own before anything gets buried.
| Question | Answer | Source |
|---|---|---|
| Can a sump pump discharge into the sanitary sewer? | No, and this is the one that is settled statewide rather than town by town. New Jersey's capacity assurance rules name disconnection of roof leaders, sump pumps and other sources of inflow from sanitary sewer lines as a required strategy, redirecting them to storm sewers where feasible. Clean groundwater in a sanitary sewer is treated flow nobody needs to treat, and in a wet spell it is what pushes a system past its capacity. | N.J.A.C. 7:14A |
| So where can it go? | Onto an absorbent surface, first choice: grass, mulch, rock or soil, far enough out that the water dissipates instead of running straight back to the foundation or off the property. Ordinances written this way generally have the discharge point approved by the town's public works office rather than left to the homeowner. | Franklin Twp. |
| What about the storm sewer? | Usually allowed, usually by permit, and usually only where the absorbent-surface option is genuinely not feasible. A town that permits a storm connection wants to know about it before it exists, not after. | Franklin Twp. |
| Can it run across the sidewalk or into the street? | Generally not without permission, and the reason is winter. A discharge that creates a build-up of icing, standing water or algae on a street, sidewalk or right-of-way is a violation in its own right, separate from where the pipe is connected. | Franklin Twp. |
| Mine has discharged the same way for twenty years. Is it grandfathered? | Conditionally, and the condition is the part people miss. An existing discharge can typically stay where it is only while it is not causing a public nuisance and not creating icing, standing water, algae or erosion on the street, sidewalk or right-of-way. The first winter it ices the sidewalk, the owner has to bring it into compliance. | Franklin Twp. |
| Can I point it at the neighbour's yard? | No. Discharge directed onto adjacent property so as to damage it or create a nuisance is prohibited, and it is the single most common reason one of these ends up in front of a town official. Water leaving your property is a boundary question before it is a drainage question. | Franklin Twp. |
Sources: N.J.A.C. 7:14A-22.16, Capacity assurance program · Township of Franklin (Somerset County), Code §201-42 to §201-46, Sump Pumps and Pipe Drain Discharge Control. Last reviewed 2026-09-18.
Why the line froze
The line is too shallow or has no fall
A discharge line laid just under the sod, or run flat, holds water after every cycle. That standing water is what freezes. A line with real fall drains itself between cycles and has nothing left in it to freeze.
It ends at grade
An outlet sitting flush with the ground silts in, ponds, and then caps itself with ice. Daylighting properly, or ending into a drywell or a rock pit sized for the flow, is the difference between a line that works in January and one that works in April.
Too long a run above frost
Every foot of pipe above frost depth is a foot that can freeze. Long runs to get the water far enough from the house are right in principle and need the depth to match.
It discharges where it comes back
Water put out ten feet from the foundation on ground that slopes back toward the house is water you will pump again. The pump is not the problem in that loop, the grading is.
What we do, and what we do not
We are an excavation and drainage contractor. The outside of this is ours: re-routing and burying the discharge line at a depth and fall that drains itself, drywells and rock pits sized for the flow, regrading so the water does not come straight back, and a storm connection where the town permits one.
The pump, the pit and the check valve are a plumber's work, and we will tell you that on the phone rather than after. Related: grading & drainage, driveway drainage and culverts, and, if the water in the basement is coming up rather than in, sewer backup.
What customers say about this work
James and the crew at JWSR LLC were outstanding from start to finish. They handled our excavation and drainage project professionally and left the property cleaner than when they arrived. They show up, do what they promise, and take pride in their work.
I've been using JWSR for several years and every job was completed professionally and accurately. Whether it was grading, installing a foundation for a generator, or trenching, they did a great job and honored the quoted price.
Common questions
Why is my sump pump running constantly but the pit is still full?
Usually a blocked or frozen discharge line. The pump pushes water up, it hits ice or a plug somewhere in the pipe, and it drains straight back into the pit, so the float never satisfies and the pump keeps cycling. Check the outside end of the line before you replace anything. A pump running against a closed pipe will burn out, so it is worth finding quickly.
Where is a sump pump allowed to discharge in New Jersey?
Onto an absorbent surface such as grass, mulch, rock or soil is the standard first choice, positioned so the water dissipates rather than draining straight to the road or the neighbour. A storm sewer, swale, ditch or basin is typically the fallback where that is not feasible, usually by permit from the town. It may not go to the sanitary sewer, and it may not create icing or standing water on a street, sidewalk or right-of-way. The exact wording is municipal, so confirm yours before you bury anything.
Why can't a sump pump go into the sanitary sewer or the floor drain?
Because clean groundwater is not sewage and the sewer system is not sized to treat it. New Jersey's capacity assurance rules name disconnecting sump pumps and roof leaders from sanitary sewer lines as a required strategy for systems under pressure. Practically, a floor drain connection is also how a basement takes on sewage during the same heavy storm the pump exists for.
The town sent me a notice about my discharge. What now?
Read which part it cites, because there are two different problems. One is the connection itself, meaning where the pipe goes. The other is the effect, meaning icing, ponding or erosion on the sidewalk or road. The second one catches discharges that have run the same way for years, because grandfathering usually lasts exactly as long as the discharge causes no nuisance.
Do you replace sump pumps?
No, and we will say so on the phone rather than after. The pump, the pit and the check valve are a plumber's work. What we do is everything outside: re-routing and burying the discharge line at proper depth and fall, drywells and rock pits, regrading so the water does not come back, and a storm connection where the town permits one.
How deep should a sump discharge line be buried?
Deep enough to have fall the whole way and to keep the standing water out of the freeze zone, which in practice means it is a grading question as much as a depth number. The honest version is that it depends on the run, the outlet and what the ground does between them, and that is what the walk is for.
What does it cost to fix a discharge line?
It is drainage work, and it prices like drainage work: the length of the run, what the ground is, whether it crosses a driveway, and where the water is going to end up. See what our grading and drainage work costs, and we quote against the actual property rather than off a page.
Freezes every winter, or the town sent a notice?
We walk it, find where the water is actually going, and put the line somewhere it can stay. 24/7 for emergencies.
Call 862-268-2510