Talk to your local municipality.

In other words you can contact the city about discharging your sump output into the household sewer system

Thanks for your input all. Additional info:

I have municipal sewer, but sump connections are not allowed as I understand it. I’m not sure if exceptions are ever made.

Surface runoff does not pool on my property much. Mostly would be running to street I suppose. An apartment building all along the back of my flat lot. I do have a drywell in back for gutter discharge from the back side of the house.

i haven’t clarified with the town yet. They said sumps can’t discharge directly into the street, but not sure what happens if it discharges to the lawn 15 ft from the street, then pools, then runs into the street.

No other pooling or flooding on site really. Basement seems to have a seasonal high water table and have post-build installed a sump. Perimeter drainage in floor is actually coming from what was supposed to be a radon collection system pipe (ie I’m pumping that water into my sump when water rises to floor level to keep up).

I am making inquiries with the town to see if they have any options for me. My best thought is to ask about locating a storm drain by my house or otherwise tapping into that system (which I assume is preferable to the sewer).

It would help to know where you are located but I'd seriously consider getting a landscape designer involved and creating a rain garden. This is an excellent method of dealing with stormwater run off, whether it comes from gutter overflow, excessive impermeable surfaces, funky grading or from a basement sump pump.

Even what appears to be flat land must have some grade for drainage. If you can't detect it visually, you might take a carpenters level (placing it on top of an 8' 2x4) and see if you can find some degree of slope for the overall lot by measuring different sections of the yard. You'll want drainage to continue in the direction that is already established. You need to get the sump water far enough away from the house that it continues in the direction of grade, though movement will be slow on account of flatness. If you can get it to a place in your yard where it will continue on it's own (to run off of your property to the street, that should be sufficient. There are typically restrictions about directing a concentrated flow of water off of your property on to anyone else's property (including city), so the water will need to spread out first to resume the form of natural sheet flow (which is expected to flow from one property to another as that's how drainage through a neighborhood works.

You will probably need to hire a civil engineer to test the soil and design a stormwater control system that usually involves an underground structure that distributes the water.

I'm surprised you didn't have to submit evidence to the local engineering dept that your site could handle the stormwater runoff from your new roof and driveway.

The house below was on a flat site across the street from a river and the stormwater control system was required by the city just for the addition.