Plumbing on the North Shore

Deep basements, and the water table under them

The North Shore's defining plumbing condition is the relationship between how deep the basements are and how high the groundwater sits. The large houses built here between 1890 and 1940 have full basements, often eight or nine feet below grade, and within a half mile of the lake that can put a basement floor at or below the seasonal water table. The consequence is not dramatic and it is not a leak: it is a sump pump that runs several times an hour for weeks after a wet spring, and a house whose dryness depends entirely on a mechanical device continuing to work.

That changes what matters about the equipment. In a subdivision where the pit fills during storms, a pump is a storm appliance. Here it is closer to a continuous-duty machine, and the things that actually determine whether a basement stays dry are the ones people skip: a cast-iron or better pump rather than the cheapest plastic unit, a check valve that does not let the pit refill on every cycle, a discharge line routed far enough from the foundation that the water does not simply return, and a backup that works when the power fails, which on this stretch of lakefront, with mature trees over overhead lines, is a genuine annual event rather than a hypothetical. The reasoning is set out under sump pump repair and installation.

Mature trees over clay laterals

The tree canopy is one of the reasons people live here and one of the reasons the sewers need attention. The parkway oaks, elms and maples in Wilmette, Winnetka, Glencoe and Evanston are older than most of the sewer laterals under them, and the laterals are vitrified clay in short sections with mortared joints. Roots do not break into sound pipe for sport; they follow moisture and enter at joints that have already moved. Once inside they thrive, because a sewer is warm, wet and full of nutrients.

The practical pattern in this housing stock is seasonal. A lateral with an established root mass will run acceptably through winter and slow down through the growing season, and the household describes it as a drain that "gets bad in summer." Cutting the roots restores the pipe for a season or two, which is legitimate maintenance rather than a failure, see sewer rodding, but a lateral being cut annually is telling you something about its condition, and that is worth confirming with footage rather than guessing at. Camera inspection distinguishes roots at one joint from a pipe that has lost its shape.

Where the pipe does need renewing, the trees are also the reason lining tends to win the argument here. A conventional dig follows the lateral, which usually means a trench through the root plate of a parkway tree the village will not thank you for damaging, and through a brick or bluestone walk that costs more to reinstate than the plumbing did. Renewing the pipe along its existing route avoids both, and the method and its honest limits are set out under trenchless sewer repair.

Steam and hot-water heat still running

A higher proportion of houses here still run their original hydronic heating than anywhere else in the metro, and that puts plumbing and heating in the same conversation. One-pipe steam, two-pipe steam and gravity hot water converted to circulators all show up regularly, often with the original cast iron radiators and, in the better houses, the original near-boiler piping layout.

These systems are not obsolete and they are not fragile. What they are is unfamiliar, and the commonest expensive mistake on the North Shore is a replacement boiler installed by someone who treated a one-pipe steam system as a hot-water system with bigger pipes. Steam sizing follows the radiation connected to it rather than a heat-loss calculation, the near-boiler piping has dimensional requirements that are not negotiable, and the traps and vents are the parts that decide whether the second floor heats. The detail is under boiler, radiator and steam heat service.

Long service lines, and what they are made of

Two things about supply piping are specific to this stock. The first is distance: a house set well back on a large lot can be seventy to a hundred and twenty feet from the b-box at the parkway, which means more pipe, more joints and more excavation than a compact lot would need for the same repair. The second is material. Houses built before the mid-1980s were plumbed in an era when lead service lines and lead-based solder were both normal, and while lake water in this region is treated to control corrosion, a lead service line is still a lead service line.

The honest position is the one we take everywhere: the material is a matter of record rather than opinion, several North Shore municipalities have been inventorying and publishing their service line materials, and that is the place to start rather than with a device. Where a line is being replaced, replacing it end to end matters, a partial replacement that leaves half the lead in the ground can disturb scale and make water quality worse for a period, which is exactly why we route this question to water service line replacement rather than to a filter sale.

Inside the house, the pattern in the pre-war stock is galvanized supply that has been partially replaced over decades, so a single building may have four materials in it. That is not automatically a problem; what it produces is unpredictable pressure and flow, and the way to establish whether it is worth staging a replacement is set out under whole-home repiping.

Ravines, bluffs and where the water goes

North of Kenilworth the land is cut by ravines running to the lake, and in Winnetka, Glencoe, Highland Park and Lake Bluff a good deal of property drainage is organised around them. That has one consequence worth knowing as a homeowner: on much of the North Shore storm water and sanitary sewage are in separate systems, which is a real advantage, a summer storm surcharging the storm sewer does not automatically push sewage back into your basement the way it does in a combined system.

The trade is that everything about your storm water becomes your responsibility. Sump discharge, downspouts, footing drains and area drains all have to go somewhere legitimate, and a sump line discharging into a sanitary connection is both a code problem and a genuine burden on the treatment system. Where a village has a specific requirement about discharge routing, that is a local question and worth asking before the work rather than after, requirements differ between neighbouring villages here more than people expect.

How dispatch works here

Crews are assigned by region rather than sent across the whole footprint, so the plumber who comes to Wilmette works Wilmette and the villages around it and knows which street has clay and which has cast iron. That matters less for a water heater and a great deal for a sewer.

Two practical notes. Parking and access on the older streets is genuinely tight, and a job needing a rig at the kerb sometimes needs a village permit for the space, worth raising when the work is booked rather than on the morning. And for anything involving excavation in a parkway, the locate request and any village or forestry review are part of the schedule, not an afterthought; a contractor who promises to dig tomorrow has not made those calls.