Water service line repair in Saint Paul, MN

The service line is the pipe that brings water from the city main to your house. In Saint Paul it may be copper, galvanized steel, lead, or on newer homes, plastic. Each fails in its own way. Galvanized steel rusts from the inside and outside until it pinholes. Copper can corrode in aggressive soil or wear where it rubs against a rock. Old lead lines crack at joints. Plastic can split from a bad fitting or root pressure.

Ground movement plays a role too. Frost heave lifts and drops soil every winter, and over decades that stress opens joints and crimps pipe at the foundation. Tree roots wrap around lines. And any time a neighbor or the city digs nearby, an old brittle line can take a hit. Knowing the pipe material tells us a lot about what we're likely to find.

We start at the meter. A leak test with all fixtures off tells us whether water is escaping before the meter or after it. Then we look at the curb stop, the foundation entry and the yard for clues. Acoustic listening equipment picks up the hiss of water escaping from a pressurized pipe underground, which lets us narrow the location before any digging starts.

If the line is metallic, we can trace its route with a locator so we know exactly where it runs. That matters because old service lines don't always go straight from the street to the house. Before excavation, we call for public utility locates so gas, electric and communication lines are marked. Then we dig a small pit right over the leak instead of trenching the whole yard.

A single leak on a line that's otherwise in good shape can be repaired by cutting out the bad section and installing a new piece with approved couplings. That's often the fastest way to get water back. But if the pipe is galvanized and badly corroded, or if it's lead, patching just moves the problem a few feet down the line. In those cases replacement is the better use of your money.

We'll show you the condition of the pipe once it's exposed. If it looks sound on both sides of the leak, we repair it. If it's thin, pitted or flaking, we'll explain the cost difference of replacing the full run. For lead lines, we'll talk about coordinating with SPRWS, since the public side may need attention too.

• Spot repair: one leak, healthy pipe on either side
• Partial replacement: a bad stretch near the house or curb
• Full replacement: galvanized, lead or repeated failures
• Trenchless pull: new line pulled through with two small pits

Service lines are supposed to run deep enough to stay below frost, but older lines aren't always buried as deep as they should be. Lines that enter under a porch, run through an unheated crawlspace, or sit under a driveway where snow is cleared and frost goes deeper are the most likely to freeze. When it happens, you'll usually have no water at any tap.

Never use a torch or open flame on a frozen service line. Open a faucet nearest where the line enters and keep the basement warm. Then call us. We use methods that warm the line safely from inside the house, and if the frozen section is underground, we can use specialized thawing equipment. Afterward, we look at why it froze and what would stop it from happening again.

Once the repair is made, we slowly bring the line back up to pressure, check for leaks at every joint, and flush the line so any dirt that got in is cleared out. We also check the main shutoff valve inside the house, since an old gate valve that won't fully close can make future repairs harder. Replacing it while the water's already off is easy.

We backfill and compact the soil in layers so it doesn't sink later. Sod or seed goes back where the grass was removed. If we had to cut a sidewalk or driveway, we'll go over the patching plan with you. We pull the city permit for service line work and schedule the inspection, and we'll let you know when water will be off and for how long.