Tips And TricksUpdated June 22, 2026
Low water pressure frustrates a lot of homeowners in La Salle, especially in houses built before the 1970s. With many local homes using half-inch or three-quarter-inch water lines, the plumbing just can't keep up with today's demand from multiple bathrooms, laundry, or kitchens running at once. Undersized water service limits everything from shower flow to the efficiency of modern water heaters. If your pressure drops every time more than one fixture runs, it's likely your main needs an upgrade.
Why Older La Salle Homes Have Undersized Service
The mix of historic and mid-century houses around La Salle often means original supply lines are still in place. Many older houses rely on galvanized steel pipes or small copper tubing, which were common decades ago. Over time, galvanized pipes build up corrosion inside, shrinking the available space for water. Even copper can develop mineral buildup with our moderately hard municipal water sourced from the Illinois River. The result is water volume barely meeting code, or failing to meet household expectations.
Common Warning Signs Your Water Line Is Too Small
- Significant drop in pressure when a second faucet or shower runs
- Long waits to fill bathtubs or washing machines
- Frequent complaints about weak water flow upstairs
- Unexplained spikes in water bills (if the old pipe has leaks)
- Visible corrosion or leaks on exposed sections of the pipe entering the house
Any of these signs are a clue that your main water service could be underperforming. The heavy clay soil and freeze-thaw cycles in La Salle also stress buried pipes, making early replacement more likely in some areas.
What Upgrading Your Water Service Involves
Replacing an undersized water line isn't just swapping a pipe. First, we measure the inside diameter of your current main, usually found right after the city shutoff. Most modern homes do best with a one-inch service line or larger, depending on household size and fixture count. Next, we coordinate with the city for permits and water shutoff. Excavation is often needed from the curb stop (usually at property edge) to your basement wall. With clay soil and a high water table, trenching in La Salle requires care to keep the work area stable.
We recommend copper or high-grade plastic like HDPE for reliability and code compliance. Once the new line is run and tied into your existing piping, it's pressure-tested before backfilling. If the main shutoff valve or pressure reducing valve (PRV) is original, this is the time to swap those out, too.
Tips Before You Upgrade Your Water Line
- Check if your home still has galvanized steel (athick coating or magnetic pipe attracts a magnet easily)
- Count all water fixtures to size the new line correctly, include hose bibs, laundry, and future baths
- Plan for possible upgrades to your water heater, since better flow can highlight heater limitations (water heater services)
- Ask about replacing old internal piping at the same time, especially if you see rusty or greenish pipes (pipe repairs and repiping)
- Watch for foundation or basement water near the work area, clay soils mean sump pumps need to be reliable (sump pump services)
If you have repeated leaks or suspect a hidden break, leak detection may be needed before digging. Our team uses listening equipment to pinpoint problems (leak detection & repair).
What to Expect During the Upgrade
Digging up your yard is never ideal, but proper planning keeps it as smooth as possible. We usually complete a water main upgrade in one to two days, depending on soil conditions and access. Heavy rains or saturated ground can extend the time, since clay holds water and gets messy. Our crew works to protect driveways, walkways, and landscaping as much as possible.
Once complete, it's a good idea to flush your indoor plumbing, especially if you have older branches or fixtures. Sediment or old pipe flakes can break loose with the stronger flow. If you see ongoing slow drains or backflow after the upgrade, a look at your drain system may help (drain cleaning).
How Proper Sizing Solves Water Pressure Issues
Upgrading to a full one-inch supply line or whatever your fixture count requires gives you consistent flow across the house, even when showers, toilets, and washing machines run at once. New pipe material holds up better against corrosion and soil shift over time. In our experience, a correctly sized main and updated inside branches can turn a home with chronic low pressure into one that meets modern needs, even in the oldest parts of La Salle.
If you suspect your water service is undersized or failing, our team is ready to help. Call 779-217-8212 and we'll walk you through the process, from sizing to final inspection. Get the clear, steady water pressure your family needs.